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From varunsax...@apache.org
Subject [20/51] [abbrv] hadoop git commit: YARN-6256. Add FROM_ID info key for timeline entities in reader response (Rohith Sharma K S via Varun Saxena)
Date Tue, 22 Aug 2017 13:34:55 GMT
YARN-6256. Add FROM_ID info key for timeline entities in reader response (Rohith Sharma K S via Varun Saxena)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/b46afcb3
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/b46afcb3
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/b46afcb3

Branch: refs/heads/YARN-5355
Commit: b46afcb36ea5e2a1bbf5998ba6d96e0536c447cb
Parents: fef3935
Author: Varun Saxena <varunsaxena@apache.org>
Authored: Tue Mar 7 23:54:38 2017 +0530
Committer: Varun Saxena <varunsaxena@apache.org>
Committed: Tue Aug 22 19:03:03 2017 +0530

----------------------------------------------------------------------
 ...stTimelineReaderWebServicesHBaseStorage.java |  33 +--
 .../storage/TestHBaseTimelineStorageApps.java   |  19 +-
 .../TestHBaseTimelineStorageEntities.java       |  21 +-
 .../storage/application/ApplicationRowKey.java  |  49 +++-
 .../storage/entity/EntityRowKey.java            |  56 ++++-
 .../storage/flow/FlowRunRowKey.java             |  47 +++-
 .../storage/reader/ApplicationEntityReader.java |  28 ++-
 .../storage/reader/FlowRunEntityReader.java     |  32 +--
 .../storage/reader/GenericEntityReader.java     |  25 +-
 .../storage/common/TestRowKeys.java             |  21 --
 .../storage/common/TestRowKeysAsString.java     | 115 ++++++++++
 .../reader/TimelineEntityFilters.java           |  29 +--
 .../reader/TimelineReaderWebServices.java       | 227 +++++++------------
 .../reader/TimelineReaderWebServicesUtils.java  |   4 +-
 14 files changed, 445 insertions(+), 261 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/reader/TestTimelineReaderWebServicesHBaseStorage.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/reader/TestTimelineReaderWebServicesHBaseStorage.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/reader/TestTimelineReaderWebServicesHBaseStorage.java
index d0f674f..b2fe267 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/reader/TestTimelineReaderWebServicesHBaseStorage.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/reader/TestTimelineReaderWebServicesHBaseStorage.java
@@ -825,7 +825,7 @@ public class TestTimelineReaderWebServicesHBaseStorage
       assertEquals(2, entities1.size());
       for (TimelineEntity entity : entities1) {
         assertNotNull(entity.getInfo());
-        assertEquals(1, entity.getInfo().size());
+        assertEquals(2, entity.getInfo().size());
         String uid =
             (String) entity.getInfo().get(TimelineReaderManager.UID_KEY);
         assertNotNull(uid);
@@ -853,7 +853,7 @@ public class TestTimelineReaderWebServicesHBaseStorage
       assertEquals(2, entities2.size());
       for (TimelineEntity entity : entities2) {
         assertNotNull(entity.getInfo());
-        assertEquals(1, entity.getInfo().size());
+        assertEquals(2, entity.getInfo().size());
         String uid =
             (String) entity.getInfo().get(TimelineReaderManager.UID_KEY);
         assertNotNull(uid);
@@ -1417,8 +1417,9 @@ public class TestTimelineReaderWebServicesHBaseStorage
         infoCnt += entity.getInfo().size();
         assertEquals("entity2", entity.getId());
       }
-      // Includes UID in info field even if fields not specified as INFO.
-      assertEquals(1, infoCnt);
+      // Includes UID and FROM_ID in info field even if fields not specified as
+      // INFO.
+      assertEquals(2, infoCnt);
 
       // infofilters=(info1 eq cluster1 AND info4 eq 35000) OR
       // (info1 eq cluster2 AND info2 eq 2.0)
@@ -1436,8 +1437,8 @@ public class TestTimelineReaderWebServicesHBaseStorage
         infoCnt += entity.getInfo().size();
         assertEquals("entity2", entity.getId());
       }
-      // Includes UID in info field.
-      assertEquals(4, infoCnt);
+      // Includes UID and FROM_ID in info field.
+      assertEquals(5, infoCnt);
 
       // Test for behavior when compare op is ne(not equals) vs ene
       // (exists and not equals). info3 does not exist for entity2. For ne,
@@ -2171,8 +2172,8 @@ public class TestTimelineReaderWebServicesHBaseStorage
       // verify for entity-10 to entity-7 in descending order.
       TimelineEntity entity = verifyPaginatedEntites(entities, limit, 10);
 
-      queryParam = "?limit=" + limit + "&&fromidprefix=" + entity.getIdPrefix()
-          + "&&fromid=" + entity.getId();
+      queryParam = "?limit=" + limit + "&fromid="
+          + entity.getInfo().get(TimelineReaderUtils.FROMID_KEY);
       uri = URI.create(resourceUri + queryParam);
       resp = getResponse(client, uri);
       entities = resp.getEntity(new GenericType<List<TimelineEntity>>() {
@@ -2180,7 +2181,8 @@ public class TestTimelineReaderWebServicesHBaseStorage
       // verify for entity-7 to entity-4 in descending order.
       entity = verifyPaginatedEntites(entities, limit, 7);
 
-      queryParam = "?limit=" + limit + "&&fromidprefix=" + entity.getIdPrefix();
+      queryParam = "?limit=" + limit + "&fromid="
+          + entity.getInfo().get(TimelineReaderUtils.FROMID_KEY);
       uri = URI.create(resourceUri + queryParam);
       resp = getResponse(client, uri);
       entities = resp.getEntity(new GenericType<List<TimelineEntity>>() {
@@ -2188,7 +2190,8 @@ public class TestTimelineReaderWebServicesHBaseStorage
       // verify for entity-4 to entity-1 in descending order.
       entity = verifyPaginatedEntites(entities, limit, 4);
 
-      queryParam = "?limit=" + limit + "&&fromidprefix=" + entity.getIdPrefix();
+      queryParam = "?limit=" + limit + "&fromid="
+          + entity.getInfo().get(TimelineReaderUtils.FROMID_KEY);
       uri = URI.create(resourceUri + queryParam);
       resp = getResponse(client, uri);
       entities = resp.getEntity(new GenericType<List<TimelineEntity>>() {
@@ -2264,7 +2267,8 @@ public class TestTimelineReaderWebServicesHBaseStorage
       TimelineEntity entity10 = entities.get(limit - 1);
 
       uri =
-          URI.create(resourceUri + queryParam + "&fromid=" + entity10.getId());
+          URI.create(resourceUri + queryParam + "&fromid="
+              + entity10.getInfo().get(TimelineReaderUtils.FROMID_KEY));
       resp = getResponse(client, uri);
       entities = resp.getEntity(new GenericType<List<TimelineEntity>>() {
       });
@@ -2308,7 +2312,8 @@ public class TestTimelineReaderWebServicesHBaseStorage
       TimelineEntity entity3 = entities.get(limit - 1);
 
       uri =
-          URI.create(resourceUri + queryParam + "&fromid=" + entity3.getId());
+          URI.create(resourceUri + queryParam + "&fromid="
+              + entity3.getInfo().get(TimelineReaderUtils.FROMID_KEY));
       resp = getResponse(client, uri);
       entities = resp.getEntity(new GenericType<List<TimelineEntity>>() {
       });
@@ -2352,7 +2357,7 @@ public class TestTimelineReaderWebServicesHBaseStorage
       TimelineEntity entity2 = entities.get(limit - 1);
 
       uri = URI.create(resourceUri + queryParam + "&fromid="
-          + entity2.getInfo().get("SYSTEM_INFO_FLOW_RUN_ID"));
+          + entity2.getInfo().get(TimelineReaderUtils.FROMID_KEY));
       resp = getResponse(client, uri);
       entities = resp.getEntity(new GenericType<List<TimelineEntity>>() {
       });
@@ -2362,7 +2367,7 @@ public class TestTimelineReaderWebServicesHBaseStorage
       assertEquals(entity3, entities.get(1));
 
       uri = URI.create(resourceUri + queryParam + "&fromid="
-          + entity3.getInfo().get("SYSTEM_INFO_FLOW_RUN_ID"));
+          + entity3.getInfo().get(TimelineReaderUtils.FROMID_KEY));
       resp = getResponse(client, uri);
       entities = resp.getEntity(new GenericType<List<TimelineEntity>>() {
       });

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageApps.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageApps.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageApps.java
index 9216d0a..4b1147d 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageApps.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageApps.java
@@ -389,6 +389,8 @@ public class TestHBaseTimelineStorageApps {
           e1.getType());
       assertEquals(cTime, e1.getCreatedTime());
       Map<String, Object> infoMap2 = e1.getInfo();
+      // fromid key is added by storage. Remove it for comparision.
+      infoMap2.remove("FROM_ID");
       assertEquals(infoMap, infoMap2);
 
       Map<String, Set<String>> isRelatedTo2 = e1.getIsRelatedToEntities();
@@ -448,6 +450,9 @@ public class TestHBaseTimelineStorageApps {
       assertEquals(TimelineEntityType.YARN_APPLICATION.toString(),
           e1.getType());
       assertEquals(cTime, e1.getCreatedTime());
+      infoMap2 = e1.getInfo();
+      // fromid key is added by storage. Remove it for comparison.
+      infoMap2.remove("FROM_ID");
       assertEquals(infoMap, e1.getInfo());
       assertEquals(isRelatedTo, e1.getIsRelatedToEntities());
       assertEquals(relatesTo, e1.getRelatesToEntities());
@@ -680,7 +685,7 @@ public class TestHBaseTimelineStorageApps {
     }
     assertEquals(5, cfgCnt);
     assertEquals(3, metricCnt);
-    assertEquals(5, infoCnt);
+    assertEquals(8, infoCnt);
     assertEquals(4, eventCnt);
     assertEquals(4, relatesToCnt);
     assertEquals(4, isRelatedToCnt);
@@ -744,7 +749,8 @@ public class TestHBaseTimelineStorageApps {
         TimelineEntityType.YARN_APPLICATION.toString(), null),
         new TimelineDataToRetrieve());
     assertNotNull(e1);
-    assertTrue(e1.getInfo().isEmpty() && e1.getConfigs().isEmpty() &&
+    assertEquals(1, e1.getInfo().size());
+    assertTrue(e1.getConfigs().isEmpty() &&
         e1.getMetrics().isEmpty() && e1.getIsRelatedToEntities().isEmpty() &&
         e1.getRelatesToEntities().isEmpty());
     Set<TimelineEntity> es1 = reader.getEntities(
@@ -755,7 +761,8 @@ public class TestHBaseTimelineStorageApps {
         new TimelineDataToRetrieve());
     assertEquals(3, es1.size());
     for (TimelineEntity e : es1) {
-      assertTrue(e.getInfo().isEmpty() && e.getConfigs().isEmpty() &&
+      assertEquals(1, e1.getInfo().size());
+      assertTrue(e.getConfigs().isEmpty() &&
           e.getMetrics().isEmpty() && e.getIsRelatedToEntities().isEmpty() &&
           e.getRelatesToEntities().isEmpty());
     }
@@ -788,7 +795,7 @@ public class TestHBaseTimelineStorageApps {
       isRelatedToCnt += entity.getIsRelatedToEntities().size();
       infoCnt += entity.getInfo().size();
     }
-    assertEquals(0, infoCnt);
+    assertEquals(3, infoCnt);
     assertEquals(4, isRelatedToCnt);
     assertEquals(3, metricsCnt);
   }
@@ -1770,7 +1777,7 @@ public class TestHBaseTimelineStorageApps {
     for (TimelineEntity entity : entities) {
       infoCnt += entity.getInfo().size();
     }
-    assertEquals(5, infoCnt);
+    assertEquals(7, infoCnt);
 
     TimelineFilterList infoFilterList1 = new TimelineFilterList(
         new TimelineKeyValueFilter(
@@ -1787,7 +1794,7 @@ public class TestHBaseTimelineStorageApps {
     for (TimelineEntity entity : entities) {
       infoCnt += entity.getInfo().size();
     }
-    assertEquals(3, infoCnt);
+    assertEquals(4, infoCnt);
 
     TimelineFilterList infoFilterList2 = new TimelineFilterList(
         new TimelineKeyValueFilter(

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageEntities.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageEntities.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageEntities.java
index 0ba841f..1237fb3 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageEntities.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase-tests/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/TestHBaseTimelineStorageEntities.java
@@ -311,6 +311,8 @@ public class TestHBaseTimelineStorageEntities {
       assertEquals(type, e1.getType());
       assertEquals(cTime, e1.getCreatedTime());
       Map<String, Object> infoMap2 = e1.getInfo();
+      // fromid key is added by storage. Remove it for comparison.
+      infoMap2.remove("FROM_ID");
       assertEquals(infoMap, infoMap2);
 
       Map<String, Set<String>> isRelatedTo2 = e1.getIsRelatedToEntities();
@@ -336,7 +338,10 @@ public class TestHBaseTimelineStorageEntities {
       assertEquals(id, e1.getId());
       assertEquals(type, e1.getType());
       assertEquals(cTime, e1.getCreatedTime());
-      assertEquals(infoMap, e1.getInfo());
+      infoMap2 = e1.getInfo();
+      // fromid key is added by storage. Remove it for comparision.
+      infoMap2.remove("FROM_ID");
+      assertEquals(infoMap, infoMap2);
       assertEquals(isRelatedTo, e1.getIsRelatedToEntities());
       assertEquals(relatesTo, e1.getRelatesToEntities());
       assertEquals(conf, e1.getConfigs());
@@ -573,7 +578,7 @@ public class TestHBaseTimelineStorageEntities {
     }
     assertEquals(5, cfgCnt);
     assertEquals(3, metricCnt);
-    assertEquals(5, infoCnt);
+    assertEquals(8, infoCnt);
     assertEquals(4, eventCnt);
     assertEquals(4, relatesToCnt);
     assertEquals(4, isRelatedToCnt);
@@ -1126,7 +1131,8 @@ public class TestHBaseTimelineStorageEntities {
         1002345678919L, "application_1231111111_1111", "world", "hello"),
         new TimelineDataToRetrieve());
     assertNotNull(e1);
-    assertTrue(e1.getInfo().isEmpty() && e1.getConfigs().isEmpty() &&
+    assertEquals(1, e1.getInfo().size());
+    assertTrue(e1.getConfigs().isEmpty() &&
         e1.getMetrics().isEmpty() && e1.getIsRelatedToEntities().isEmpty() &&
         e1.getRelatesToEntities().isEmpty());
     Set<TimelineEntity> es1 = reader.getEntities(
@@ -1136,9 +1142,10 @@ public class TestHBaseTimelineStorageEntities {
         new TimelineDataToRetrieve());
     assertEquals(3, es1.size());
     for (TimelineEntity e : es1) {
-      assertTrue(e.getInfo().isEmpty() && e.getConfigs().isEmpty() &&
+      assertTrue(e.getConfigs().isEmpty() &&
           e.getMetrics().isEmpty() && e.getIsRelatedToEntities().isEmpty() &&
           e.getRelatesToEntities().isEmpty());
+      assertEquals(1, e.getInfo().size());
     }
   }
 
@@ -1167,7 +1174,7 @@ public class TestHBaseTimelineStorageEntities {
       isRelatedToCnt += entity.getIsRelatedToEntities().size();
       infoCnt += entity.getInfo().size();
     }
-    assertEquals(0, infoCnt);
+    assertEquals(3, infoCnt);
     assertEquals(4, isRelatedToCnt);
     assertEquals(3, metricsCnt);
   }
@@ -1603,7 +1610,7 @@ public class TestHBaseTimelineStorageEntities {
     for (TimelineEntity entity : entities) {
       infoCnt += entity.getInfo().size();
     }
-    assertEquals(5, infoCnt);
+    assertEquals(7, infoCnt);
 
     TimelineFilterList infoFilterList1 = new TimelineFilterList(
         new TimelineKeyValueFilter(
@@ -1619,7 +1626,7 @@ public class TestHBaseTimelineStorageEntities {
     for (TimelineEntity entity : entities) {
       infoCnt += entity.getInfo().size();
     }
-    assertEquals(3, infoCnt);
+    assertEquals(4, infoCnt);
 
     TimelineFilterList infoFilterList2 = new TimelineFilterList(
         new TimelineKeyValueFilter(

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/application/ApplicationRowKey.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/application/ApplicationRowKey.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/application/ApplicationRowKey.java
index da62fdf..e89a6a7 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/application/ApplicationRowKey.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/application/ApplicationRowKey.java
@@ -18,9 +18,13 @@
 
 package org.apache.hadoop.yarn.server.timelineservice.storage.application;
 
+import java.util.List;
+
 import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderUtils;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.AppIdKeyConverter;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.KeyConverter;
+import org.apache.hadoop.yarn.server.timelineservice.storage.common.KeyConverterToString;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.LongConverter;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.Separator;
 
@@ -33,7 +37,7 @@ public class ApplicationRowKey {
   private final String flowName;
   private final Long flowRunId;
   private final String appId;
-  private final KeyConverter<ApplicationRowKey> appRowKeyConverter =
+  private final ApplicationRowKeyConverter appRowKeyConverter =
       new ApplicationRowKeyConverter();
 
   public ApplicationRowKey(String clusterId, String userId, String flowName,
@@ -86,6 +90,24 @@ public class ApplicationRowKey {
   }
 
   /**
+   * Constructs a row key for the application table as follows:
+   * {@code clusterId!userName!flowName!flowRunId!AppId}.
+   * @return String representation of row key.
+   */
+  public String getRowKeyAsString() {
+    return appRowKeyConverter.encodeAsString(this);
+  }
+
+  /**
+   * Given the encoded row key as string, returns the row key as an object.
+   * @param encodedRowKey String representation of row key.
+   * @return A <cite>ApplicationRowKey</cite> object.
+   */
+  public static ApplicationRowKey parseRowKeyFromString(String encodedRowKey) {
+    return new ApplicationRowKeyConverter().decodeFromString(encodedRowKey);
+  }
+
+  /**
    * Encodes and decodes row key for application table. The row key is of the
    * form: clusterId!userName!flowName!flowRunId!appId. flowRunId is a long,
    * appId is encoded and decoded using {@link AppIdKeyConverter} and rest are
@@ -93,7 +115,7 @@ public class ApplicationRowKey {
    * <p>
    */
   final private static class ApplicationRowKeyConverter implements
-      KeyConverter<ApplicationRowKey> {
+      KeyConverter<ApplicationRowKey>, KeyConverterToString<ApplicationRowKey> {
 
     private final KeyConverter<String> appIDKeyConverter =
         new AppIdKeyConverter();
@@ -201,6 +223,29 @@ public class ApplicationRowKey {
       return new ApplicationRowKey(clusterId, userId, flowName, flowRunId,
           appId);
     }
+
+    @Override
+    public String encodeAsString(ApplicationRowKey key) {
+      if (key.clusterId == null || key.userId == null || key.flowName == null
+          || key.flowRunId == null || key.appId == null) {
+        throw new IllegalArgumentException();
+      }
+      return TimelineReaderUtils
+          .joinAndEscapeStrings(new String[] {key.clusterId, key.userId,
+              key.flowName, key.flowRunId.toString(), key.appId});
+    }
+
+    @Override
+    public ApplicationRowKey decodeFromString(String encodedRowKey) {
+      List<String> split = TimelineReaderUtils.split(encodedRowKey);
+      if (split == null || split.size() != 5) {
+        throw new IllegalArgumentException(
+            "Invalid row key for application table.");
+      }
+      Long flowRunId = Long.valueOf(split.get(3));
+      return new ApplicationRowKey(split.get(0), split.get(1), split.get(2),
+          flowRunId, split.get(4));
+    }
   }
 
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/entity/EntityRowKey.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/entity/EntityRowKey.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/entity/EntityRowKey.java
index a8f1d0c..7bf02f2 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/entity/EntityRowKey.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/entity/EntityRowKey.java
@@ -17,9 +17,13 @@
  */
 package org.apache.hadoop.yarn.server.timelineservice.storage.entity;
 
+import java.util.List;
+
 import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderUtils;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.AppIdKeyConverter;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.KeyConverter;
+import org.apache.hadoop.yarn.server.timelineservice.storage.common.KeyConverterToString;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.LongConverter;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.Separator;
 
@@ -35,7 +39,7 @@ public class EntityRowKey {
   private final String entityType;
   private final Long entityIdPrefix;
   private final String entityId;
-  private final KeyConverter<EntityRowKey> entityRowKeyConverter =
+  private final EntityRowKeyConverter entityRowKeyConverter =
       new EntityRowKeyConverter();
 
   public EntityRowKey(String clusterId, String userId, String flowName,
@@ -96,7 +100,6 @@ public class EntityRowKey {
 
   /**
    * Given the raw row key as bytes, returns the row key as an object.
-   *
    * @param rowKey byte representation of row key.
    * @return An <cite>EntityRowKey</cite> object.
    */
@@ -105,6 +108,27 @@ public class EntityRowKey {
   }
 
   /**
+   * Constructs a row key for the entity table as follows:
+   * <p>
+   * {@code userName!clusterId!flowName!flowRunId!AppId!
+   * entityType!entityIdPrefix!entityId}.
+   * </p>
+   * @return String representation of row key.
+   */
+  public String getRowKeyAsString() {
+    return entityRowKeyConverter.encodeAsString(this);
+  }
+
+  /**
+   * Given the encoded row key as string, returns the row key as an object.
+   * @param encodedRowKey String representation of row key.
+   * @return A <cite>EntityRowKey</cite> object.
+   */
+  public static EntityRowKey parseRowKeyFromString(String encodedRowKey) {
+    return new EntityRowKeyConverter().decodeFromString(encodedRowKey);
+  }
+
+  /**
    * Encodes and decodes row key for entity table. The row key is of the form :
    * userName!clusterId!flowName!flowRunId!appId!entityType!entityId. flowRunId
    * is a long, appId is encoded/decoded using {@link AppIdKeyConverter} and
@@ -112,7 +136,7 @@ public class EntityRowKey {
    * <p>
    */
   final private static class EntityRowKeyConverter implements
-      KeyConverter<EntityRowKey> {
+      KeyConverter<EntityRowKey>, KeyConverterToString<EntityRowKey> {
 
     private final AppIdKeyConverter appIDKeyConverter = new AppIdKeyConverter();
 
@@ -245,5 +269,31 @@ public class EntityRowKey {
       return new EntityRowKey(clusterId, userId, flowName, flowRunId, appId,
           entityType, entityPrefixId, entityId);
     }
+
+    @Override
+    public String encodeAsString(EntityRowKey key) {
+      if (key.clusterId == null || key.userId == null || key.flowName == null
+          || key.flowRunId == null || key.appId == null
+          || key.entityType == null || key.entityIdPrefix == null
+          || key.entityId == null) {
+        throw new IllegalArgumentException();
+      }
+      return TimelineReaderUtils
+          .joinAndEscapeStrings(new String[] {key.clusterId, key.userId,
+              key.flowName, key.flowRunId.toString(), key.appId, key.entityType,
+              key.entityIdPrefix.toString(), key.entityId});
+    }
+
+    @Override
+    public EntityRowKey decodeFromString(String encodedRowKey) {
+      List<String> split = TimelineReaderUtils.split(encodedRowKey);
+      if (split == null || split.size() != 8) {
+        throw new IllegalArgumentException("Invalid row key for entity table.");
+      }
+      Long flowRunId = Long.valueOf(split.get(3));
+      Long entityIdPrefix = Long.valueOf(split.get(6));
+      return new EntityRowKey(split.get(0), split.get(1), split.get(2),
+          flowRunId, split.get(4), split.get(5), entityIdPrefix, split.get(7));
+    }
   }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/flow/FlowRunRowKey.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/flow/FlowRunRowKey.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/flow/FlowRunRowKey.java
index 8fda9a8..7ce91cf 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/flow/FlowRunRowKey.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/flow/FlowRunRowKey.java
@@ -17,8 +17,12 @@
  */
 package org.apache.hadoop.yarn.server.timelineservice.storage.flow;
 
+import java.util.List;
+
 import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderUtils;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.KeyConverter;
+import org.apache.hadoop.yarn.server.timelineservice.storage.common.KeyConverterToString;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.LongConverter;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.Separator;
 
@@ -70,7 +74,6 @@ public class FlowRunRowKey {
 
   /**
    * Given the raw row key as bytes, returns the row key as an object.
-   *
    * @param rowKey Byte representation of row key.
    * @return A <cite>FlowRunRowKey</cite> object.
    */
@@ -79,6 +82,24 @@ public class FlowRunRowKey {
   }
 
   /**
+   * Constructs a row key for the flow run table as follows:
+   * {@code clusterId!userId!flowName!Flow Run Id}.
+   * @return String representation of row key
+   */
+  public String getRowKeyAsString() {
+    return flowRunRowKeyConverter.encodeAsString(this);
+  }
+
+  /**
+   * Given the encoded row key as string, returns the row key as an object.
+   * @param encodedRowKey String representation of row key.
+   * @return A <cite>FlowRunRowKey</cite> object.
+   */
+  public static FlowRunRowKey parseRowKeyFromString(String encodedRowKey) {
+    return new FlowRunRowKeyConverter().decodeFromString(encodedRowKey);
+  }
+
+  /**
    * returns the Flow Key as a verbose String output.
    * @return String
    */
@@ -101,7 +122,7 @@ public class FlowRunRowKey {
    * <p>
    */
   final private static class FlowRunRowKeyConverter implements
-      KeyConverter<FlowRunRowKey> {
+      KeyConverter<FlowRunRowKey>, KeyConverterToString<FlowRunRowKey> {
 
     private FlowRunRowKeyConverter() {
     }
@@ -186,5 +207,27 @@ public class FlowRunRowKey {
           LongConverter.invertLong(Bytes.toLong(rowKeyComponents[3]));
       return new FlowRunRowKey(clusterId, userId, flowName, flowRunId);
     }
+
+    @Override
+    public String encodeAsString(FlowRunRowKey key) {
+      if (key.clusterId == null || key.userId == null || key.flowName == null
+          || key.flowRunId == null) {
+        throw new IllegalArgumentException();
+      }
+      return TimelineReaderUtils.joinAndEscapeStrings(new String[] {
+          key.clusterId, key.userId, key.flowName, key.flowRunId.toString()});
+    }
+
+    @Override
+    public FlowRunRowKey decodeFromString(String encodedRowKey) {
+      List<String> split = TimelineReaderUtils.split(encodedRowKey);
+      if (split == null || split.size() != 4) {
+        throw new IllegalArgumentException(
+            "Invalid row key for flow run table.");
+      }
+      Long flowRunId = Long.valueOf(split.get(3));
+      return new FlowRunRowKey(split.get(0), split.get(1), split.get(2),
+          flowRunId);
+    }
   }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/ApplicationEntityReader.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/ApplicationEntityReader.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/ApplicationEntityReader.java
index 4e8286d..b4bb005 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/ApplicationEntityReader.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/ApplicationEntityReader.java
@@ -39,6 +39,7 @@ import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntityType;
 import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineDataToRetrieve;
 import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineEntityFilters;
 import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderContext;
+import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderUtils;
 import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineFilterList;
 import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineFilterUtils;
 import org.apache.hadoop.yarn.server.timelineservice.storage.TimelineReader.Field;
@@ -48,11 +49,11 @@ import org.apache.hadoop.yarn.server.timelineservice.storage.application.Applica
 import org.apache.hadoop.yarn.server.timelineservice.storage.application.ApplicationRowKey;
 import org.apache.hadoop.yarn.server.timelineservice.storage.application.ApplicationRowKeyPrefix;
 import org.apache.hadoop.yarn.server.timelineservice.storage.application.ApplicationTable;
-import org.apache.hadoop.yarn.server.timelineservice.storage.apptoflow.AppToFlowRowKey;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.BaseTable;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.HBaseTimelineStorageUtils;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.RowKeyPrefix;
 import org.apache.hadoop.yarn.server.timelineservice.storage.common.TimelineStorageUtils;
+import org.apache.hadoop.yarn.webapp.BadRequestException;
 
 import com.google.common.base.Preconditions;
 
@@ -372,18 +373,17 @@ class ApplicationEntityReader extends GenericEntityReader {
           context.getFlowRunId());
       scan.setRowPrefixFilter(applicationRowKeyPrefix.getRowKeyPrefix());
     } else {
-      Long flowRunId = context.getFlowRunId();
-      if (flowRunId == null) {
-        AppToFlowRowKey appToFlowRowKey = new AppToFlowRowKey(
-            getFilters().getFromId());
-        FlowContext flowContext = lookupFlowContext(appToFlowRowKey,
-            context.getClusterId(), hbaseConf, conn);
-        flowRunId = flowContext.getFlowRunId();
+      ApplicationRowKey applicationRowKey = null;
+      try {
+        applicationRowKey =
+            ApplicationRowKey.parseRowKeyFromString(getFilters().getFromId());
+      } catch (IllegalArgumentException e) {
+        throw new BadRequestException("Invalid filter fromid is provided.");
+      }
+      if (!context.getClusterId().equals(applicationRowKey.getClusterId())) {
+        throw new BadRequestException(
+            "fromid doesn't belong to clusterId=" + context.getClusterId());
       }
-
-      ApplicationRowKey applicationRowKey =
-          new ApplicationRowKey(context.getClusterId(), context.getUserId(),
-              context.getFlowName(), flowRunId, getFilters().getFromId());
 
       // set start row
       scan.setStartRow(applicationRowKey.getRowKey());
@@ -497,6 +497,10 @@ class ApplicationEntityReader extends GenericEntityReader {
     if (hasField(fieldsToRetrieve, Field.METRICS)) {
       readMetrics(entity, result, ApplicationColumnPrefix.METRIC);
     }
+
+    ApplicationRowKey rowKey = ApplicationRowKey.parseRowKey(result.getRow());
+    entity.getInfo().put(TimelineReaderUtils.FROMID_KEY,
+        rowKey.getRowKeyAsString());
     return entity;
   }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/FlowRunEntityReader.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/FlowRunEntityReader.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/FlowRunEntityReader.java
index cedf96a..af043b3 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/FlowRunEntityReader.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/FlowRunEntityReader.java
@@ -39,6 +39,7 @@ import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity;
 import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineDataToRetrieve;
 import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineEntityFilters;
 import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderContext;
+import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderUtils;
 import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineFilterList;
 import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineFilterUtils;
 import org.apache.hadoop.yarn.server.timelineservice.storage.TimelineReader.Field;
@@ -217,11 +218,17 @@ class FlowRunEntityReader extends TimelineEntityReader {
           context.getUserId(), context.getFlowName());
       scan.setRowPrefixFilter(flowRunRowKeyPrefix.getRowKeyPrefix());
     } else {
-
-      FlowRunRowKey flowRunRowKey =
-          new FlowRunRowKey(context.getClusterId(), context.getUserId(),
-              context.getFlowName(), Long.parseLong(getFilters().getFromId()));
-
+      FlowRunRowKey flowRunRowKey = null;
+      try {
+        flowRunRowKey =
+            FlowRunRowKey.parseRowKeyFromString(getFilters().getFromId());
+      } catch (IllegalArgumentException e) {
+        throw new BadRequestException("Invalid filter fromid is provided.");
+      }
+      if (!context.getClusterId().equals(flowRunRowKey.getClusterId())) {
+        throw new BadRequestException(
+            "fromid doesn't belong to clusterId=" + context.getClusterId());
+      }
       // set start row
       scan.setStartRow(flowRunRowKey.getRowKey());
 
@@ -247,16 +254,11 @@ class FlowRunEntityReader extends TimelineEntityReader {
 
   @Override
   protected TimelineEntity parseEntity(Result result) throws IOException {
-    TimelineReaderContext context = getContext();
     FlowRunEntity flowRun = new FlowRunEntity();
-    flowRun.setUser(context.getUserId());
-    flowRun.setName(context.getFlowName());
-    if (isSingleEntityRead()) {
-      flowRun.setRunId(context.getFlowRunId());
-    } else {
-      FlowRunRowKey rowKey = FlowRunRowKey.parseRowKey(result.getRow());
-      flowRun.setRunId(rowKey.getFlowRunId());
-    }
+    FlowRunRowKey rowKey = FlowRunRowKey.parseRowKey(result.getRow());
+    flowRun.setRunId(rowKey.getFlowRunId());
+    flowRun.setUser(rowKey.getUserId());
+    flowRun.setName(rowKey.getFlowName());
 
     // read the start time
     Long startTime = (Long) FlowRunColumn.MIN_START_TIME.readResult(result);
@@ -285,6 +287,8 @@ class FlowRunEntityReader extends TimelineEntityReader {
 
     // set the id
     flowRun.setId(flowRun.getId());
+    flowRun.getInfo().put(TimelineReaderUtils.FROMID_KEY,
+        rowKey.getRowKeyAsString());
     return flowRun;
   }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/GenericEntityReader.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/GenericEntityReader.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/GenericEntityReader.java
index f6904c5..39013d9 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/GenericEntityReader.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/reader/GenericEntityReader.java
@@ -40,6 +40,7 @@ import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity;
 import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineDataToRetrieve;
 import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineEntityFilters;
 import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderContext;
+import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderUtils;
 import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineFilterList;
 import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineFilterUtils;
 import org.apache.hadoop.yarn.server.timelineservice.storage.TimelineReader.Field;
@@ -56,6 +57,7 @@ import org.apache.hadoop.yarn.server.timelineservice.storage.entity.EntityColumn
 import org.apache.hadoop.yarn.server.timelineservice.storage.entity.EntityRowKey;
 import org.apache.hadoop.yarn.server.timelineservice.storage.entity.EntityRowKeyPrefix;
 import org.apache.hadoop.yarn.server.timelineservice.storage.entity.EntityTable;
+import org.apache.hadoop.yarn.webapp.BadRequestException;
 
 import com.google.common.base.Preconditions;
 
@@ -475,19 +477,27 @@ class GenericEntityReader extends TimelineEntityReader {
     TimelineReaderContext context = getContext();
     RowKeyPrefix<EntityRowKey> entityRowKeyPrefix = null;
     // default mode, will always scans from beginning of entity type.
-    if (getFilters() == null || getFilters().getFromIdPrefix() == null) {
+    if (getFilters() == null || getFilters().getFromId() == null) {
       entityRowKeyPrefix = new EntityRowKeyPrefix(context.getClusterId(),
           context.getUserId(), context.getFlowName(), context.getFlowRunId(),
           context.getAppId(), context.getEntityType(), null, null);
       scan.setRowPrefixFilter(entityRowKeyPrefix.getRowKeyPrefix());
     } else { // pagination mode, will scan from given entityIdPrefix!enitityId
-      entityRowKeyPrefix = new EntityRowKeyPrefix(context.getClusterId(),
-          context.getUserId(), context.getFlowName(), context.getFlowRunId(),
-          context.getAppId(), context.getEntityType(),
-          getFilters().getFromIdPrefix(), getFilters().getFromId());
+
+      EntityRowKey entityRowKey = null;
+      try {
+        entityRowKey =
+            EntityRowKey.parseRowKeyFromString(getFilters().getFromId());
+      } catch (IllegalArgumentException e) {
+        throw new BadRequestException("Invalid filter fromid is provided.");
+      }
+      if (!context.getClusterId().equals(entityRowKey.getClusterId())) {
+        throw new BadRequestException(
+            "fromid doesn't belong to clusterId=" + context.getClusterId());
+      }
 
       // set start row
-      scan.setStartRow(entityRowKeyPrefix.getRowKeyPrefix());
+      scan.setStartRow(entityRowKey.getRowKey());
 
       // get the bytes for stop row
       entityRowKeyPrefix = new EntityRowKeyPrefix(context.getClusterId(),
@@ -599,6 +609,9 @@ class GenericEntityReader extends TimelineEntityReader {
     if (hasField(fieldsToRetrieve, Field.METRICS)) {
       readMetrics(entity, result, EntityColumnPrefix.METRIC);
     }
+
+    entity.getInfo().put(TimelineReaderUtils.FROMID_KEY,
+        parseRowKey.getRowKeyAsString());
     return entity;
   }
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeys.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeys.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeys.java
index bac5f85..cbd2273 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeys.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeys.java
@@ -23,7 +23,6 @@ import static org.junit.Assert.assertTrue;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity;
-import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderUtils;
 import org.apache.hadoop.yarn.server.timelineservice.storage.application.ApplicationRowKey;
 import org.apache.hadoop.yarn.server.timelineservice.storage.application.ApplicationRowKeyPrefix;
 import org.apache.hadoop.yarn.server.timelineservice.storage.apptoflow.AppToFlowRowKey;
@@ -226,26 +225,6 @@ public class TestRowKeys {
   }
 
   @Test
-  public void testFlowActivityRowKeyAsString() {
-    String cluster = "cl" + TimelineReaderUtils.DEFAULT_DELIMITER_CHAR + "uster"
-        + TimelineReaderUtils.DEFAULT_ESCAPE_CHAR;
-    String user = TimelineReaderUtils.DEFAULT_ESCAPE_CHAR + "user";
-    String fName = "dummy_" + TimelineReaderUtils.DEFAULT_DELIMITER_CHAR
-        + TimelineReaderUtils.DEFAULT_ESCAPE_CHAR + "flow"
-        + TimelineReaderUtils.DEFAULT_DELIMITER_CHAR;
-    Long ts = 1459900830000L;
-    Long dayTimestamp = HBaseTimelineStorageUtils.getTopOfTheDayTimestamp(ts);
-    String rowKeyAsString =
-        new FlowActivityRowKey(cluster, ts, user, fName).getRowKeyAsString();
-    FlowActivityRowKey rowKey =
-        FlowActivityRowKey.parseRowKeyFromString(rowKeyAsString);
-    assertEquals(cluster, rowKey.getClusterId());
-    assertEquals(dayTimestamp, rowKey.getDayTimestamp());
-    assertEquals(user, rowKey.getUserId());
-    assertEquals(fName, rowKey.getFlowName());
-  }
-
-  @Test
   public void testFlowRunRowKey() {
     byte[] byteRowKey =
         new FlowRunRowKey(CLUSTER, USER, FLOW_NAME, FLOW_RUN_ID).getRowKey();

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeysAsString.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeysAsString.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeysAsString.java
new file mode 100644
index 0000000..f0ef720
--- /dev/null
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/src/test/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/TestRowKeysAsString.java
@@ -0,0 +1,115 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.yarn.server.timelineservice.storage.common;
+
+import static org.junit.Assert.assertEquals;
+
+import org.apache.hadoop.yarn.api.records.ApplicationId;
+import org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity;
+import org.apache.hadoop.yarn.server.timelineservice.reader.TimelineReaderUtils;
+import org.apache.hadoop.yarn.server.timelineservice.storage.application.ApplicationRowKey;
+import org.apache.hadoop.yarn.server.timelineservice.storage.entity.EntityRowKey;
+import org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowActivityRowKey;
+import org.apache.hadoop.yarn.server.timelineservice.storage.flow.FlowRunRowKey;
+import org.junit.Test;
+
+/**
+ * Test for row key as string.
+ */
+public class TestRowKeysAsString {
+
+  private final static String CLUSTER =
+      "cl" + TimelineReaderUtils.DEFAULT_DELIMITER_CHAR + "uster"
+          + TimelineReaderUtils.DEFAULT_ESCAPE_CHAR;
+  private final static String USER =
+      TimelineReaderUtils.DEFAULT_ESCAPE_CHAR + "user";
+  private final static String FLOW_NAME =
+      "dummy_" + TimelineReaderUtils.DEFAULT_DELIMITER_CHAR
+          + TimelineReaderUtils.DEFAULT_ESCAPE_CHAR + "flow"
+          + TimelineReaderUtils.DEFAULT_DELIMITER_CHAR;
+  private final static Long FLOW_RUN_ID = System.currentTimeMillis();
+  private final static String APPLICATION_ID =
+      ApplicationId.newInstance(System.currentTimeMillis(), 1).toString();
+
+  @Test(timeout = 10000)
+  public void testApplicationRow() {
+    String rowKeyAsString = new ApplicationRowKey(CLUSTER, USER, FLOW_NAME,
+        FLOW_RUN_ID, APPLICATION_ID).getRowKeyAsString();
+    ApplicationRowKey rowKey =
+        ApplicationRowKey.parseRowKeyFromString(rowKeyAsString);
+    assertEquals(CLUSTER, rowKey.getClusterId());
+    assertEquals(USER, rowKey.getUserId());
+    assertEquals(FLOW_NAME, rowKey.getFlowName());
+    assertEquals(FLOW_RUN_ID, rowKey.getFlowRunId());
+    assertEquals(APPLICATION_ID, rowKey.getAppId());
+  }
+
+  @Test(timeout = 10000)
+  public void testEntityRowKey() {
+    char del = TimelineReaderUtils.DEFAULT_DELIMITER_CHAR;
+    char esc = TimelineReaderUtils.DEFAULT_ESCAPE_CHAR;
+    String id = del + esc + "ent" + esc + del + "ity" + esc + del + esc + "id"
+        + esc + del + esc;
+    String type = "entity" + esc + del + esc + "Type";
+    TimelineEntity entity = new TimelineEntity();
+    entity.setId(id);
+    entity.setType(type);
+    entity.setIdPrefix(54321);
+
+    String rowKeyAsString =
+        new EntityRowKey(CLUSTER, USER, FLOW_NAME, FLOW_RUN_ID, APPLICATION_ID,
+            entity.getType(), entity.getIdPrefix(), entity.getId())
+                .getRowKeyAsString();
+    EntityRowKey rowKey = EntityRowKey.parseRowKeyFromString(rowKeyAsString);
+    assertEquals(CLUSTER, rowKey.getClusterId());
+    assertEquals(USER, rowKey.getUserId());
+    assertEquals(FLOW_NAME, rowKey.getFlowName());
+    assertEquals(FLOW_RUN_ID, rowKey.getFlowRunId());
+    assertEquals(APPLICATION_ID, rowKey.getAppId());
+    assertEquals(entity.getType(), rowKey.getEntityType());
+    assertEquals(entity.getIdPrefix(), rowKey.getEntityIdPrefix().longValue());
+    assertEquals(entity.getId(), rowKey.getEntityId());
+
+  }
+
+  @Test(timeout = 10000)
+  public void testFlowActivityRowKey() {
+    Long ts = 1459900830000L;
+    Long dayTimestamp = HBaseTimelineStorageUtils.getTopOfTheDayTimestamp(ts);
+    String rowKeyAsString = new FlowActivityRowKey(CLUSTER, ts, USER, FLOW_NAME)
+        .getRowKeyAsString();
+    FlowActivityRowKey rowKey =
+        FlowActivityRowKey.parseRowKeyFromString(rowKeyAsString);
+    assertEquals(CLUSTER, rowKey.getClusterId());
+    assertEquals(dayTimestamp, rowKey.getDayTimestamp());
+    assertEquals(USER, rowKey.getUserId());
+    assertEquals(FLOW_NAME, rowKey.getFlowName());
+  }
+
+  @Test(timeout = 10000)
+  public void testFlowRunRowKey() {
+    String rowKeyAsString =
+        new FlowRunRowKey(CLUSTER, USER, FLOW_NAME, FLOW_RUN_ID)
+            .getRowKeyAsString();
+    FlowRunRowKey rowKey = FlowRunRowKey.parseRowKeyFromString(rowKeyAsString);
+    assertEquals(CLUSTER, rowKey.getClusterId());
+    assertEquals(USER, rowKey.getUserId());
+    assertEquals(FLOW_NAME, rowKey.getFlowName());
+    assertEquals(FLOW_RUN_ID, rowKey.getFlowRunId());
+  }
+}

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineEntityFilters.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineEntityFilters.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineEntityFilters.java
index 79a83c6..dc3e3ec 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineEntityFilters.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineEntityFilters.java
@@ -99,19 +99,10 @@ import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineKeyVa
  * filter list, event filters can be evaluated with logical AND/OR and we can
  * create a hierarchy of these {@link TimelineExistsFilter} objects. If null or
  * empty, the filter is not applied.</li>
- * <li><b>fromIdPrefix</b> - If specified, retrieve entities with an id prefix
- * greater than or equal to the specified fromIdPrefix. If fromIdPrefix is same
- * for all entities of a given entity type, then the user must provide fromId as
- * a filter to denote the start entity from which further entities will be
- * fetched. fromIdPrefix is mandatory even in the case the entity id prefix is
- * not used and should be set to 0.</li>
- * <li><b>fromId</b> - If specified along with fromIdPrefix, retrieve entities
- * with an id prefix greater than or equal to specified id prefix in
- * fromIdPrefix and entity id lexicographically greater than or equal to entity
- * id specified in fromId. Please note than fromIdPrefix is mandatory if fromId
- * is specified, otherwise, the filter will be ignored. It is recommended to
- * provide both fromIdPrefix and fromId filters for more accurate results as id
- * prefix may not be unique for an entity.</li>
+ * <li><b>fromId</b> - If specified, retrieve the next set of entities from the
+ * given fromId. The set of entities retrieved is inclusive of specified fromId.
+ * fromId should be taken from the value associated with FROM_ID info key in
+ * entity response which was sent earlier.</li>
  * </ul>
  */
 @Private
@@ -126,7 +117,6 @@ public class TimelineEntityFilters {
   private TimelineFilterList configFilters;
   private TimelineFilterList metricFilters;
   private TimelineFilterList eventFilters;
-  private Long fromIdPrefix;
   private String fromId;
   private static final long DEFAULT_BEGIN_TIME = 0L;
   private static final long DEFAULT_END_TIME = Long.MAX_VALUE;
@@ -146,11 +136,10 @@ public class TimelineEntityFilters {
       TimelineFilterList entityInfoFilters,
       TimelineFilterList entityConfigFilters,
       TimelineFilterList entityMetricFilters,
-      TimelineFilterList entityEventFilters, Long fromidprefix, String fromid) {
+      TimelineFilterList entityEventFilters, String fromid) {
     this(entityLimit, timeBegin, timeEnd, entityRelatesTo, entityIsRelatedTo,
         entityInfoFilters, entityConfigFilters, entityMetricFilters,
         entityEventFilters);
-    this.fromIdPrefix = fromidprefix;
     this.fromId = fromid;
   }
 
@@ -276,12 +265,4 @@ public class TimelineEntityFilters {
   public void setFromId(String fromId) {
     this.fromId = fromId;
   }
-
-  public Long getFromIdPrefix() {
-    return fromIdPrefix;
-  }
-
-  public void setFromIdPrefix(Long fromIdPrefix) {
-    this.fromIdPrefix = fromIdPrefix;
-  }
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/b46afcb3/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineReaderWebServices.java
----------------------------------------------------------------------
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineReaderWebServices.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineReaderWebServices.java
index 290c255..94ac948 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineReaderWebServices.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/TimelineReaderWebServices.java
@@ -265,20 +265,10 @@ public class TimelineReaderWebServices {
    *     or has a value less than 1, and metrics have to be retrieved, then
    *     metricsLimit will be considered as 1 i.e. latest single value of
    *     metric(s) will be returned. (Optional query param).
-   * @param fromIdPrefix If specified, retrieve entities with an id prefix
-   *     greater than or equal to the specified fromIdPrefix. If fromIdPrefix
-   *     is same for all entities of a given entity type, then the user must
-   *     provide fromId as a filter to denote the start entity from which
-   *     further entities will be fetched. fromIdPrefix is mandatory even
-   *     in the case the entity id prefix is not used and should be set to 0.
-   * @param fromId If specified along with fromIdPrefix, retrieve entities with
-   *     an id prefix greater than or equal to specified id prefix in
-   *     fromIdPrefix and entity id lexicographically greater than or equal
-   *     to entity id specified in fromId. Please note than fromIdPrefix is
-   *     mandatory if fromId is specified, otherwise, the filter will be
-   *     ignored. It is recommended to provide both fromIdPrefix and fromId
-   *     filters for more accurate results as id prefix may not be unique
-   *     for an entity.
+   * @param fromId If specified, retrieve the next set of entities from the
+   *     given fromId. The set of entities retrieved is inclusive of specified
+   *     fromId. fromId should be taken from the value associated with FROM_ID
+   *     info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing
    *     a set of <cite>TimelineEntity</cite> instances of the given entity type
@@ -310,7 +300,6 @@ public class TimelineReaderWebServices {
       @QueryParam("metricstoretrieve") String metricsToRetrieve,
       @QueryParam("fields") String fields,
       @QueryParam("metricslimit") String metricsLimit,
-      @QueryParam("fromidprefix") String fromIdPrefix,
       @QueryParam("fromid") String fromId) {
     String url = req.getRequestURI() +
         (req.getQueryString() == null ? "" :
@@ -335,7 +324,7 @@ public class TimelineReaderWebServices {
           TimelineReaderWebServicesUtils.createTimelineEntityFilters(
           limit, createdTimeStart, createdTimeEnd, relatesTo, isRelatedTo,
               infofilters, conffilters, metricfilters, eventfilters,
-              fromIdPrefix, fromId),
+              fromId),
           TimelineReaderWebServicesUtils.createTimelineDataToRetrieve(
           confsToRetrieve, metricsToRetrieve, fields, metricsLimit));
     } catch (Exception e) {
@@ -418,20 +407,10 @@ public class TimelineReaderWebServices {
    *     or has a value less than 1, and metrics have to be retrieved, then
    *     metricsLimit will be considered as 1 i.e. latest single value of
    *     metric(s) will be returned. (Optional query param).
-   * @param fromIdPrefix If specified, retrieve entities with an id prefix
-   *     greater than or equal to the specified fromIdPrefix. If fromIdPrefix
-   *     is same for all entities of a given entity type, then the user must
-   *     provide fromId as a filter to denote the start entity from which
-   *     further entities will be fetched. fromIdPrefix is mandatory even
-   *     in the case the entity id prefix is not used and should be set to 0.
-   * @param fromId If specified along with fromIdPrefix, retrieve entities with
-   *     an id prefix greater than or equal to specified id prefix in
-   *     fromIdPrefix and entity id lexicographically greater than or equal
-   *     to entity id specified in fromId. Please note than fromIdPrefix is
-   *     mandatory if fromId is specified, otherwise, the filter will be
-   *     ignored. It is recommended to provide both fromIdPrefix and fromId
-   *     filters for more accurate results as id prefix may not be unique
-   *     for an entity.
+   * @param fromId If specified, retrieve the next set of entities from the
+   *     given fromId. The set of entities retrieved is inclusive of specified
+   *     fromId. fromId should be taken from the value associated with FROM_ID
+   *     info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing
    *     a set of <cite>TimelineEntity</cite> instances of the given entity type
@@ -468,12 +447,11 @@ public class TimelineReaderWebServices {
       @QueryParam("metricstoretrieve") String metricsToRetrieve,
       @QueryParam("fields") String fields,
       @QueryParam("metricslimit") String metricsLimit,
-      @QueryParam("fromidprefix") String fromIdPrefix,
       @QueryParam("fromid") String fromId) {
     return getEntities(req, res, null, appId, entityType, userId, flowName,
         flowRunId, limit, createdTimeStart, createdTimeEnd, relatesTo,
         isRelatedTo, infofilters, conffilters, metricfilters, eventfilters,
-        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, fromIdPrefix,
+        confsToRetrieve, metricsToRetrieve, fields, metricsLimit,
         fromId);
   }
 
@@ -545,20 +523,10 @@ public class TimelineReaderWebServices {
    *     or has a value less than 1, and metrics have to be retrieved, then
    *     metricsLimit will be considered as 1 i.e. latest single value of
    *     metric(s) will be returned. (Optional query param).
-   * @param fromIdPrefix If specified, retrieve entities with an id prefix
-   *     greater than or equal to the specified fromIdPrefix. If fromIdPrefix
-   *     is same for all entities of a given entity type, then the user must
-   *     provide fromId as a filter to denote the start entity from which
-   *     further entities will be fetched. fromIdPrefix is mandatory even
-   *     in the case the entity id prefix is not used and should be set to 0.
-   * @param fromId If specified along with fromIdPrefix, retrieve entities with
-   *     an id prefix greater than or equal to specified id prefix in
-   *     fromIdPrefix and entity id lexicographically greater than or equal
-   *     to entity id specified in fromId. Please note than fromIdPrefix is
-   *     mandatory if fromId is specified, otherwise, the filter will be
-   *     ignored. It is recommended to provide both fromIdPrefix and fromId
-   *     filters for more accurate results as id prefix may not be unique
-   *     for an entity.
+   * @param fromId If specified, retrieve the next set of entities from the
+   *     given fromId. The set of entities retrieved is inclusive of specified
+   *     fromId. fromId should be taken from the value associated with FROM_ID
+   *     info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing
    *     a set of <cite>TimelineEntity</cite> instances of the given entity type
@@ -596,7 +564,6 @@ public class TimelineReaderWebServices {
       @QueryParam("metricstoretrieve") String metricsToRetrieve,
       @QueryParam("fields") String fields,
       @QueryParam("metricslimit") String metricsLimit,
-      @QueryParam("fromidprefix") String fromIdPrefix,
       @QueryParam("fromid") String fromId) {
     String url = req.getRequestURI() +
         (req.getQueryString() == null ? "" :
@@ -617,7 +584,7 @@ public class TimelineReaderWebServices {
           TimelineReaderWebServicesUtils.createTimelineEntityFilters(
           limit, createdTimeStart, createdTimeEnd, relatesTo, isRelatedTo,
               infofilters, conffilters, metricfilters, eventfilters,
-              fromIdPrefix, fromId),
+              fromId),
           TimelineReaderWebServicesUtils.createTimelineDataToRetrieve(
           confsToRetrieve, metricsToRetrieve, fields, metricsLimit));
     } catch (Exception e) {
@@ -1098,9 +1065,10 @@ public class TimelineReaderWebServices {
    *     METRICS makes sense for flow runs hence only ALL or METRICS are
    *     supported as fields for fetching flow runs. Other fields will lead to
    *     HTTP 400 (Bad Request) response. (Optional query param).
-   * @param fromId Defines the flow run id. If specified, retrieve the next
-   *     set of flow runs from the given id. The set of flow runs retrieved
-   *     is inclusive of specified fromId.
+   * @param fromId If specified, retrieve the next set of flow run entities
+   *     from the given fromId. The set of entities retrieved is inclusive of
+   *     specified fromId. fromId should be taken from the value associated
+   *     with FROM_ID info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing a
    *     set of <cite>FlowRunEntity</cite> instances for the given flow are
@@ -1145,7 +1113,7 @@ public class TimelineReaderWebServices {
       entities = timelineReaderManager.getEntities(context,
           TimelineReaderWebServicesUtils.createTimelineEntityFilters(
           limit, createdTimeStart, createdTimeEnd, null, null, null,
-              null, null, null, null, fromId),
+              null, null, null, fromId),
           TimelineReaderWebServicesUtils.createTimelineDataToRetrieve(
           null, metricsToRetrieve, fields, null));
     } catch (Exception e) {
@@ -1188,9 +1156,10 @@ public class TimelineReaderWebServices {
    *     METRICS makes sense for flow runs hence only ALL or METRICS are
    *     supported as fields for fetching flow runs. Other fields will lead to
    *     HTTP 400 (Bad Request) response. (Optional query param).
-   * @param fromId Defines the flow run id. If specified, retrieve the next
-   *     set of flow runs from the given id. The set of flow runs retrieved
-   *     is inclusive of specified fromId.
+   * @param fromId If specified, retrieve the next set of flow run entities
+   *     from the given fromId. The set of entities retrieved is inclusive of
+   *     specified fromId. fromId should be taken from the value associated
+   *     with FROM_ID info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing a
    *     set of <cite>FlowRunEntity</cite> instances for the given flow are
@@ -1247,9 +1216,10 @@ public class TimelineReaderWebServices {
    *     METRICS makes sense for flow runs hence only ALL or METRICS are
    *     supported as fields for fetching flow runs. Other fields will lead to
    *     HTTP 400 (Bad Request) response. (Optional query param).
-   * @param fromId Defines the flow run id. If specified, retrieve the next
-   *     set of flow runs from the given id. The set of flow runs retrieved
-   *     is inclusive of specified fromId.
+   * @param fromId If specified, retrieve the next set of flow run entities
+   *     from the given fromId. The set of entities retrieved is inclusive of
+   *     specified fromId. fromId should be taken from the value associated
+   *     with FROM_ID info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing a
    *     set of <cite>FlowRunEntity</cite> instances for the given flow are
@@ -1293,7 +1263,7 @@ public class TimelineReaderWebServices {
               TimelineEntityType.YARN_FLOW_RUN.toString(), null, null),
           TimelineReaderWebServicesUtils.createTimelineEntityFilters(
           limit, createdTimeStart, createdTimeEnd, null, null, null,
-              null, null, null, null, fromId),
+              null, null, null, fromId),
           TimelineReaderWebServicesUtils.createTimelineDataToRetrieve(
           null, metricsToRetrieve, fields, null));
     } catch (Exception e) {
@@ -1423,7 +1393,7 @@ public class TimelineReaderWebServices {
       DateRange range = parseDateRange(dateRange);
       TimelineEntityFilters entityFilters =
           TimelineReaderWebServicesUtils.createTimelineEntityFilters(
-              limit, null, null, null, null, null, null, null, null, null,
+              limit, null, null, null, null, null, null, null, null,
               fromId);
       entityFilters.setCreatedTimeBegin(range.dateStart);
       entityFilters.setCreatedTimeEnd(range.dateEnd);
@@ -1744,9 +1714,10 @@ public class TimelineReaderWebServices {
    *     or has a value less than 1, and metrics have to be retrieved, then
    *     metricsLimit will be considered as 1 i.e. latest single value of
    *     metric(s) will be returned. (Optional query param).
-   * @param fromId Defines the application id. If specified, retrieve the next
-   *     set of applications from the given id. The set of applications
-   *     retrieved is inclusive of specified fromId.
+   * @param fromId If specified, retrieve the next set of applications
+   *     from the given fromId. The set of applications retrieved is inclusive
+   *     of specified fromId. fromId should be taken from the value associated
+   *     with FROM_ID info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing
    *     a set of <cite>TimelineEntity</cite> instances representing apps is
@@ -1799,7 +1770,7 @@ public class TimelineReaderWebServices {
       entities = timelineReaderManager.getEntities(context,
           TimelineReaderWebServicesUtils.createTimelineEntityFilters(
           limit, createdTimeStart, createdTimeEnd, relatesTo, isRelatedTo,
-              infofilters, conffilters, metricfilters, eventfilters, null,
+              infofilters, conffilters, metricfilters, eventfilters,
               fromId),
           TimelineReaderWebServicesUtils.createTimelineDataToRetrieve(
           confsToRetrieve, metricsToRetrieve, fields, metricsLimit));
@@ -1876,9 +1847,10 @@ public class TimelineReaderWebServices {
    *     or has a value less than 1, and metrics have to be retrieved, then
    *     metricsLimit will be considered as 1 i.e. latest single value of
    *     metric(s) will be returned. (Optional query param).
-   * @param fromId Defines the application id. If specified, retrieve the next
-   *     set of applications from the given id. The set of applications
-   *     retrieved is inclusive of specified fromId.
+   * @param fromId If specified, retrieve the next set of applications
+   *     from the given fromId. The set of applications retrieved is inclusive
+   *     of specified fromId. fromId should be taken from the value associated
+   *     with FROM_ID info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing
    *     a set of <cite>TimelineEntity</cite> instances representing apps is
@@ -1916,7 +1888,7 @@ public class TimelineReaderWebServices {
         TimelineEntityType.YARN_APPLICATION.toString(), userId, flowName,
         flowRunId, limit, createdTimeStart, createdTimeEnd, relatesTo,
         isRelatedTo, infofilters, conffilters, metricfilters, eventfilters,
-        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, null, fromId);
+        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, fromId);
   }
 
   /**
@@ -1980,9 +1952,10 @@ public class TimelineReaderWebServices {
    *     or has a value less than 1, and metrics have to be retrieved, then
    *     metricsLimit will be considered as 1 i.e. latest single value of
    *     metric(s) will be returned. (Optional query param).
-   * @param fromId Defines the application id. If specified, retrieve the next
-   *     set of applications from the given id. The set of applications
-   *     retrieved is inclusive of specified fromId.
+   * @param fromId If specified, retrieve the next set of applications
+   *     from the given fromId. The set of applications retrieved is inclusive
+   *     of specified fromId. fromId should be taken from the value associated
+   *     with FROM_ID info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing
    *     a set of <cite>TimelineEntity</cite> instances representing apps is
@@ -2022,7 +1995,7 @@ public class TimelineReaderWebServices {
         TimelineEntityType.YARN_APPLICATION.toString(), userId, flowName,
         flowRunId, limit, createdTimeStart, createdTimeEnd, relatesTo,
         isRelatedTo, infofilters, conffilters, metricfilters, eventfilters,
-        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, null, fromId);
+        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, fromId);
   }
 
   /**
@@ -2083,9 +2056,10 @@ public class TimelineReaderWebServices {
    *     or has a value less than 1, and metrics have to be retrieved, then
    *     metricsLimit will be considered as 1 i.e. latest single value of
    *     metric(s) will be returned. (Optional query param).
-   * @param fromId Defines the application id. If specified, retrieve the next
-   *     set of applications from the given id. The set of applications
-   *     retrieved is inclusive of specified fromId.
+   * @param fromId If specified, retrieve the next set of applications
+   *     from the given fromId. The set of applications retrieved is inclusive
+   *     of specified fromId. fromId should be taken from the value associated
+   *     with FROM_ID info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing
    *     a set of <cite>TimelineEntity</cite> instances representing apps is
@@ -2122,7 +2096,7 @@ public class TimelineReaderWebServices {
         TimelineEntityType.YARN_APPLICATION.toString(), userId, flowName,
         null, limit, createdTimeStart, createdTimeEnd, relatesTo, isRelatedTo,
         infofilters, conffilters, metricfilters, eventfilters,
-        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, null, fromId);
+        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, fromId);
   }
 
   /**
@@ -2184,9 +2158,10 @@ public class TimelineReaderWebServices {
    *     or has a value less than 1, and metrics have to be retrieved, then
    *     metricsLimit will be considered as 1 i.e. latest single value of
    *     metric(s) will be returned. (Optional query param).
-   * @param fromId Defines the application id. If specified, retrieve the next
-   *     set of applications from the given id. The set of applications
-   *     retrieved is inclusive of specified fromId.
+   * @param fromId If specified, retrieve the next set of applications
+   *     from the given fromId. The set of applications retrieved is inclusive
+   *     of specified fromId. fromId should be taken from the value associated
+   *     with FROM_ID info key in entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing
    *     a set of <cite>TimelineEntity</cite> instances representing apps is
@@ -2224,7 +2199,7 @@ public class TimelineReaderWebServices {
         TimelineEntityType.YARN_APPLICATION.toString(), userId, flowName,
         null, limit, createdTimeStart, createdTimeEnd, relatesTo, isRelatedTo,
         infofilters, conffilters, metricfilters, eventfilters,
-        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, null, fromId);
+        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, fromId);
   }
 
   /**
@@ -2295,21 +2270,11 @@ public class TimelineReaderWebServices {
    *          have to be retrieved, then metricsLimit will be considered as 1
    *          i.e. latest single value of metric(s) will be returned. (Optional
    *          query param).
-   * @param fromIdPrefix If specified, retrieve entities with an id prefix
-   *          greater than or equal to the specified fromIdPrefix. If
-   *          fromIdPrefix is same for all entities of a given entity type, then
-   *          the user must provide fromId as a filter to denote the start
-   *          entity from which further entities will be fetched. fromIdPrefix
-   *          is mandatory even in the case the entity id prefix is not used and
-   *          should be set to 0.
-   * @param fromId If specified along with fromIdPrefix, retrieve entities with
-   *          an id prefix greater than or equal to specified id prefix in
-   *          fromIdPrefix and entity id lexicographically greater than or equal
-   *          to entity id specified in fromId. Please note than fromIdPrefix is
-   *          mandatory if fromId is specified, otherwise, the filter will be
-   *          ignored. It is recommended to provide both fromIdPrefix and fromId
-   *          filters for more accurate results as id prefix may not be unique
-   *          for an entity.
+   * @param fromId If specified, retrieve the next set of application-attempt
+   *         entities from the given fromId. The set of application-attempt
+   *         entities retrieved is inclusive of specified fromId. fromId should
+   *         be taken from the value associated with FROM_ID info key in
+   *         entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing a
    *         set of <cite>TimelineEntity</cite> instances of the app-attempt
@@ -2343,13 +2308,12 @@ public class TimelineReaderWebServices {
       @QueryParam("metricstoretrieve") String metricsToRetrieve,
       @QueryParam("fields") String fields,
       @QueryParam("metricslimit") String metricsLimit,
-      @QueryParam("fromidprefix") String fromIdPrefix,
       @QueryParam("fromid") String fromId) {
 
     return getAppAttempts(req, res, null, appId, userId, flowName, flowRunId,
         limit, createdTimeStart, createdTimeEnd, relatesTo, isRelatedTo,
         infofilters, conffilters, metricfilters, eventfilters, confsToRetrieve,
-        metricsToRetrieve, fields, metricsLimit, fromIdPrefix, fromId);
+        metricsToRetrieve, fields, metricsLimit, fromId);
   }
 
   /**
@@ -2421,21 +2385,11 @@ public class TimelineReaderWebServices {
    *          have to be retrieved, then metricsLimit will be considered as 1
    *          i.e. latest single value of metric(s) will be returned. (Optional
    *          query param).
-   * @param fromIdPrefix If specified, retrieve entities with an id prefix
-   *          greater than or equal to the specified fromIdPrefix. If
-   *          fromIdPrefix is same for all entities of a given entity type, then
-   *          the user must provide fromId as a filter to denote the start
-   *          entity from which further entities will be fetched. fromIdPrefix
-   *          is mandatory even in the case the entity id prefix is not used and
-   *          should be set to 0.
-   * @param fromId If specified along with fromIdPrefix, retrieve entities with
-   *          an id prefix greater than or equal to specified id prefix in
-   *          fromIdPrefix and entity id lexicographically greater than or equal
-   *          to entity id specified in fromId. Please note than fromIdPrefix is
-   *          mandatory if fromId is specified, otherwise, the filter will be
-   *          ignored. It is recommended to provide both fromIdPrefix and fromId
-   *          filters for more accurate results as id prefix may not be unique
-   *          for an entity.
+   * @param fromId If specified, retrieve the next set of application-attempt
+   *         entities from the given fromId. The set of application-attempt
+   *         entities retrieved is inclusive of specified fromId. fromId should
+   *         be taken from the value associated with FROM_ID info key in
+   *         entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing a
    *         set of <cite>TimelineEntity</cite> instances of the app-attempts
@@ -2470,7 +2424,6 @@ public class TimelineReaderWebServices {
       @QueryParam("metricstoretrieve") String metricsToRetrieve,
       @QueryParam("fields") String fields,
       @QueryParam("metricslimit") String metricsLimit,
-      @QueryParam("fromidprefix") String fromIdPrefix,
       @QueryParam("fromid") String fromId) {
 
     return getEntities(req, res, clusterId, appId,
@@ -2478,7 +2431,7 @@ public class TimelineReaderWebServices {
         flowName, flowRunId, limit, createdTimeStart, createdTimeEnd, relatesTo,
         isRelatedTo, infofilters, conffilters, metricfilters, eventfilters,
         confsToRetrieve, metricsToRetrieve, fields, metricsLimit,
-        fromIdPrefix, fromId);
+        fromId);
   }
 
   /**
@@ -2700,21 +2653,11 @@ public class TimelineReaderWebServices {
    *          have to be retrieved, then metricsLimit will be considered as 1
    *          i.e. latest single value of metric(s) will be returned. (Optional
    *          query param).
-   * @param fromIdPrefix If specified, retrieve entities with an id prefix
-   *          greater than or equal to the specified fromIdPrefix. If
-   *          fromIdPrefix is same for all entities of a given entity type, then
-   *          the user must provide fromId as a filter to denote the start
-   *          entity from which further entities will be fetched. fromIdPrefix
-   *          is mandatory even in the case the entity id prefix is not used and
-   *          should be set to 0.
-   * @param fromId If specified along with fromIdPrefix, retrieve entities with
-   *          an id prefix greater than or equal to specified id prefix in
-   *          fromIdPrefix and entity id lexicographically greater than or equal
-   *          to entity id specified in fromId. Please note than fromIdPrefix is
-   *          mandatory if fromId is specified, otherwise, the filter will be
-   *          ignored. It is recommended to provide both fromIdPrefix and fromId
-   *          filters for more accurate results as id prefix may not be unique
-   *          for an entity.
+   * @param fromId If specified, retrieve the next set of container
+   *         entities from the given fromId. The set of container
+   *         entities retrieved is inclusive of specified fromId. fromId should
+   *         be taken from the value associated with FROM_ID info key in
+   *         entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing a
    *         set of <cite>TimelineEntity</cite> instances of the containers
@@ -2749,12 +2692,11 @@ public class TimelineReaderWebServices {
       @QueryParam("metricstoretrieve") String metricsToRetrieve,
       @QueryParam("fields") String fields,
       @QueryParam("metricslimit") String metricsLimit,
-      @QueryParam("fromidprefix") String fromIdPrefix,
       @QueryParam("fromid") String fromId) {
     return getContainers(req, res, null, appId, appattemptId, userId, flowName,
         flowRunId, limit, createdTimeStart, createdTimeEnd, relatesTo,
         isRelatedTo, infofilters, conffilters, metricfilters, eventfilters,
-        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, fromIdPrefix,
+        confsToRetrieve, metricsToRetrieve, fields, metricsLimit,
         fromId);
   }
 
@@ -2829,21 +2771,11 @@ public class TimelineReaderWebServices {
    *          have to be retrieved, then metricsLimit will be considered as 1
    *          i.e. latest single value of metric(s) will be returned. (Optional
    *          query param).
-   * @param fromIdPrefix If specified, retrieve entities with an id prefix
-   *          greater than or equal to the specified fromIdPrefix. If
-   *          fromIdPrefix is same for all entities of a given entity type, then
-   *          the user must provide fromId as a filter to denote the start
-   *          entity from which further entities will be fetched. fromIdPrefix
-   *          is mandatory even in the case the entity id prefix is not used and
-   *          should be set to 0.
-   * @param fromId If specified along with fromIdPrefix, retrieve entities with
-   *          an id prefix greater than or equal to specified id prefix in
-   *          fromIdPrefix and entity id lexicographically greater than or equal
-   *          to entity id specified in fromId. Please note than fromIdPrefix is
-   *          mandatory if fromId is specified, otherwise, the filter will be
-   *          ignored. It is recommended to provide both fromIdPrefix and fromId
-   *          filters for more accurate results as id prefix may not be unique
-   *          for an entity.
+   * @param fromId If specified, retrieve the next set of container
+   *         entities from the given fromId. The set of container
+   *         entities retrieved is inclusive of specified fromId. fromId should
+   *         be taken from the value associated with FROM_ID info key in
+   *         entity response which was sent earlier.
    *
    * @return If successful, a HTTP 200(OK) response having a JSON representing a
    *         set of <cite>TimelineEntity</cite> instances of the containers
@@ -2880,7 +2812,6 @@ public class TimelineReaderWebServices {
       @QueryParam("metricstoretrieve") String metricsToRetrieve,
       @QueryParam("fields") String fields,
       @QueryParam("metricslimit") String metricsLimit,
-      @QueryParam("fromidprefix") String fromIdPrefix,
       @QueryParam("fromid") String fromId) {
 
     String entityType = TimelineEntityType.YARN_CONTAINER.toString();
@@ -2899,7 +2830,7 @@ public class TimelineReaderWebServices {
     return getEntities(req, res, clusterId, appId, entityType, userId, flowName,
         flowRunId, limit, createdTimeStart, createdTimeEnd, relatesTo,
         isRelatedTo, infofilter, conffilters, metricfilters, eventfilters,
-        confsToRetrieve, metricsToRetrieve, fields, metricsLimit, fromIdPrefix,
+        confsToRetrieve, metricsToRetrieve, fields, metricsLimit,
         fromId);
   }
 


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