hadoop-common-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From sj...@apache.org
Subject [06/50] [abbrv] hadoop git commit: MAPREDUCE-6688. Store job configurations in Timeline Service v2 (Varun Saxena via sjlee)
Date Sun, 10 Jul 2016 15:50:57 GMT
MAPREDUCE-6688. Store job configurations in Timeline Service v2 (Varun Saxena via sjlee)


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/000a4d8e
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/000a4d8e
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/000a4d8e

Branch: refs/heads/YARN-2928
Commit: 000a4d8e133920d71af304f2015d3674daed74fa
Parents: 089caf4
Author: Sangjin Lee <sjlee@apache.org>
Authored: Tue May 3 09:19:36 2016 -0700
Committer: Sangjin Lee <sjlee@apache.org>
Committed: Sun Jul 10 08:45:57 2016 -0700

----------------------------------------------------------------------
 .../jobhistory/JobHistoryEventHandler.java      | 57 +++++++++++-
 .../mapreduce/v2/app/job/impl/JobImpl.java      |  2 +-
 .../mapreduce/jobhistory/JobSubmittedEvent.java | 38 +++++++-
 .../mapreduce/util/JobHistoryEventUtils.java    |  3 +
 .../mapred/TestMRTimelineEventHandling.java     | 92 +++++++++++++++++---
 .../org/apache/hadoop/mapred/UtilsForTests.java |  8 ++
 6 files changed, 181 insertions(+), 19 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hadoop/blob/000a4d8e/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobHistoryEventHandler.java
----------------------------------------------------------------------
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobHistoryEventHandler.java
b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobHistoryEventHandler.java
index 528b450..887533d 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobHistoryEventHandler.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobHistoryEventHandler.java
@@ -1074,7 +1074,16 @@ public class JobHistoryEventHandler extends AbstractService
     entity.setId(jobId.toString());
     return entity;
   }
-  
+
+  private org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity
+      createJobEntity(JobId jobId) {
+    org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity entity =
+        new org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity();
+    entity.setId(jobId.toString());
+    entity.setType(MAPREDUCE_JOB_ENTITY_TYPE);
+    return entity;
+  }
+
   // create ApplicationEntity with job finished Metrics from HistoryEvent
   private org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity
       createAppEntityWithJobMetrics(HistoryEvent event, JobId jobId) {
@@ -1133,6 +1142,46 @@ public class JobHistoryEventHandler extends AbstractService
     return entity;
   }
 
+  private void publishConfigsOnJobSubmittedEvent(JobSubmittedEvent event,
+      JobId jobId) {
+    if (event.getJobConf() == null) {
+      return;
+    }
+    // Publish job configurations both as job and app entity.
+    // Configs are split into multiple entities if they exceed 100kb in size.
+    org.apache.hadoop.yarn.api.records.timelineservice.
+        TimelineEntity jobEntityForConfigs = createJobEntity(jobId);
+    ApplicationEntity appEntityForConfigs = new ApplicationEntity();
+    String appId = jobId.getAppId().toString();
+    appEntityForConfigs.setId(appId);
+    try {
+      int configSize = 0;
+      for (Map.Entry<String, String> entry : event.getJobConf()) {
+        int size = entry.getKey().length() + entry.getValue().length();
+        configSize += size;
+        if (configSize > JobHistoryEventUtils.ATS_CONFIG_PUBLISH_SIZE_BYTES) {
+          if (jobEntityForConfigs.getConfigs().size() > 0) {
+            timelineClient.putEntities(jobEntityForConfigs);
+            timelineClient.putEntities(appEntityForConfigs);
+            jobEntityForConfigs = createJobEntity(jobId);
+            appEntityForConfigs = new ApplicationEntity();
+            appEntityForConfigs.setId(appId);
+          }
+          configSize = size;
+        }
+        jobEntityForConfigs.addConfig(entry.getKey(), entry.getValue());
+        appEntityForConfigs.addConfig(entry.getKey(), entry.getValue());
+      }
+      if (configSize > 0) {
+        timelineClient.putEntities(jobEntityForConfigs);
+        timelineClient.putEntities(appEntityForConfigs);
+      }
+    } catch (IOException | YarnException e) {
+      LOG.error("Exception while publishing configs on JOB_SUBMITTED Event " +
+          " for the job : " + jobId, e);
+    }
+  }
+
   private void processEventForNewTimelineService(HistoryEvent event,
       JobId jobId, long timestamp) {
     org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity tEntity =
@@ -1252,8 +1301,12 @@ public class JobHistoryEventHandler extends AbstractService
     } catch (IOException | YarnException e) {
       LOG.error("Failed to process Event " + event.getEventType()
           + " for the job : " + jobId, e);
+      return;
+    }
+    if (event.getEventType() == EventType.JOB_SUBMITTED) {
+      // Publish configs after main job submitted event has been posted.
+      publishConfigsOnJobSubmittedEvent((JobSubmittedEvent)event, jobId);
     }
-
   }
 
   private void setSummarySlotSeconds(JobSummary summary, Counters allCounters) {

http://git-wip-us.apache.org/repos/asf/hadoop/blob/000a4d8e/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java
----------------------------------------------------------------------
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java
b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java
index b7036a5..5127a43 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/JobImpl.java
@@ -1445,7 +1445,7 @@ public class JobImpl implements org.apache.hadoop.mapreduce.v2.app.job.Job,
             job.conf.get(MRJobConfig.WORKFLOW_NAME, ""),
             job.conf.get(MRJobConfig.WORKFLOW_NODE_NAME, ""),
             getWorkflowAdjacencies(job.conf),
-            job.conf.get(MRJobConfig.WORKFLOW_TAGS, ""));
+            job.conf.get(MRJobConfig.WORKFLOW_TAGS, ""), job.conf);
         job.eventHandler.handle(new JobHistoryEvent(job.jobId, jse));
         //TODO JH Verify jobACLs, UserName via UGI?
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/000a4d8e/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobSubmittedEvent.java
----------------------------------------------------------------------
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobSubmittedEvent.java
b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobSubmittedEvent.java
index 07edb58..7d05571 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobSubmittedEvent.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/jobhistory/JobSubmittedEvent.java
@@ -26,6 +26,7 @@ import java.util.Set;
 import org.apache.avro.util.Utf8;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.mapred.JobConf;
 import org.apache.hadoop.mapreduce.JobACL;
 import org.apache.hadoop.mapreduce.JobID;
 import org.apache.hadoop.security.authorize.AccessControlList;
@@ -41,6 +42,7 @@ import org.apache.hadoop.yarn.api.records.timelineservice.TimelineMetric;
 @InterfaceStability.Unstable
 public class JobSubmittedEvent implements HistoryEvent {
   private JobSubmitted datum = new JobSubmitted();
+  private JobConf jobConf = null;
 
   /**
    * Create an event to record job submission
@@ -83,6 +85,31 @@ public class JobSubmittedEvent implements HistoryEvent {
         workflowAdjacencies, "");
   }
 
+  /**
+   * Create an event to record job submission.
+   * @param id The job Id of the job
+   * @param jobName Name of the job
+   * @param userName Name of the user who submitted the job
+   * @param submitTime Time of submission
+   * @param jobConfPath Path of the Job Configuration file
+   * @param jobACLs The configured acls for the job.
+   * @param jobQueueName The job-queue to which this job was submitted to
+   * @param workflowId The Id of the workflow
+   * @param workflowName The name of the workflow
+   * @param workflowNodeName The node name of the workflow
+   * @param workflowAdjacencies The adjacencies of the workflow
+   * @param workflowTags Comma-separated tags for the workflow
+   */
+  public JobSubmittedEvent(JobID id, String jobName, String userName,
+      long submitTime, String jobConfPath,
+      Map<JobACL, AccessControlList> jobACLs, String jobQueueName,
+      String workflowId, String workflowName, String workflowNodeName,
+      String workflowAdjacencies, String workflowTags) {
+    this(id, jobName, userName, submitTime, jobConfPath, jobACLs,
+        jobQueueName, workflowId, workflowName, workflowNodeName,
+        workflowAdjacencies, workflowTags, null);
+  }
+
     /**
      * Create an event to record job submission
      * @param id The job Id of the job
@@ -97,12 +124,13 @@ public class JobSubmittedEvent implements HistoryEvent {
      * @param workflowNodeName The node name of the workflow
      * @param workflowAdjacencies The adjacencies of the workflow
      * @param workflowTags Comma-separated tags for the workflow
+     * @param conf Job configuration
      */
     public JobSubmittedEvent(JobID id, String jobName, String userName,
         long submitTime, String jobConfPath,
         Map<JobACL, AccessControlList> jobACLs, String jobQueueName,
         String workflowId, String workflowName, String workflowNodeName,
-        String workflowAdjacencies, String workflowTags) {
+        String workflowAdjacencies, String workflowTags, JobConf conf) {
     datum.setJobid(new Utf8(id.toString()));
     datum.setJobName(new Utf8(jobName));
     datum.setUserName(new Utf8(userName));
@@ -132,6 +160,7 @@ public class JobSubmittedEvent implements HistoryEvent {
     if (workflowTags != null) {
       datum.setWorkflowTags(new Utf8(workflowTags));
     }
+    jobConf = conf;
   }
 
   JobSubmittedEvent() {}
@@ -208,7 +237,11 @@ public class JobSubmittedEvent implements HistoryEvent {
   }
   /** Get the event type */
   public EventType getEventType() { return EventType.JOB_SUBMITTED; }
-  
+
+  public JobConf getJobConf() {
+    return jobConf;
+  }
+
   @Override
   public TimelineEvent toTimelineEvent() {
     TimelineEvent tEvent = new TimelineEvent();
@@ -234,5 +267,4 @@ public class JobSubmittedEvent implements HistoryEvent {
   public Set<TimelineMetric> getTimelineMetrics() {
     return null;
   }
-
 }

http://git-wip-us.apache.org/repos/asf/hadoop/blob/000a4d8e/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/util/JobHistoryEventUtils.java
----------------------------------------------------------------------
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/util/JobHistoryEventUtils.java
b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/util/JobHistoryEventUtils.java
index 225d517..35d066c 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/util/JobHistoryEventUtils.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/util/JobHistoryEventUtils.java
@@ -36,6 +36,9 @@ public final class JobHistoryEventUtils {
   private JobHistoryEventUtils() {
   }
 
+  // Number of bytes of config which can be published in one shot to ATSv2.
+  public static final int ATS_CONFIG_PUBLISH_SIZE_BYTES = 10 * 1024;
+
   public static JsonNode countersToJSON(Counters counters) {
     ObjectMapper mapper = new ObjectMapper();
     ArrayNode nodes = mapper.createArrayNode();

http://git-wip-us.apache.org/repos/asf/hadoop/blob/000a4d8e/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestMRTimelineEventHandling.java
----------------------------------------------------------------------
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestMRTimelineEventHandling.java
b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestMRTimelineEventHandling.java
index 5915a43..fde9e64 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestMRTimelineEventHandling.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestMRTimelineEventHandling.java
@@ -26,7 +26,9 @@ import java.io.File;
 import java.io.FileReader;
 import java.io.IOException;
 import java.util.EnumSet;
+import java.util.Iterator;
 import java.util.List;
+import java.util.Set;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.logging.Log;
@@ -55,6 +57,8 @@ import org.apache.hadoop.yarn.util.timeline.TimelineUtils;
 import org.junit.Assert;
 import org.junit.Test;
 
+import com.google.common.collect.Sets;
+
 public class TestMRTimelineEventHandling {
 
   private static final String TIMELINE_AUX_SERVICE_NAME = "timeline_collector";
@@ -191,8 +195,17 @@ public class TestMRTimelineEventHandling {
       Path inDir = new Path("input");
       Path outDir = new Path("output");
       LOG.info("Run 1st job which should be successful.");
+      JobConf successConf = new JobConf(conf);
+      successConf.set("dummy_conf1",
+          UtilsForTests.createConfigValue(51 * 1024));
+      successConf.set("dummy_conf2",
+          UtilsForTests.createConfigValue(51 * 1024));
+      successConf.set("huge_dummy_conf1",
+          UtilsForTests.createConfigValue(101 * 1024));
+      successConf.set("huge_dummy_conf2",
+          UtilsForTests.createConfigValue(101 * 1024));
       RunningJob job =
-          UtilsForTests.runJobSucceed(new JobConf(conf), inDir, outDir);
+          UtilsForTests.runJobSucceed(successConf, inDir, outDir);
       Assert.assertEquals(JobStatus.SUCCEEDED,
           job.getJobStatus().getState().getValue());
 
@@ -270,7 +283,11 @@ public class TestMRTimelineEventHandling {
     Assert.assertTrue("jobEventFilePath: " + jobEventFilePath +
         " does not exist.",
         jobEventFile.exists());
-    verifyMetricsWhenEvent(jobEventFile, EventType.JOB_FINISHED.name());
+    verifyEntity(jobEventFile, EventType.JOB_FINISHED.name(),
+        true, false, null);
+    Set<String> cfgsToCheck = Sets.newHashSet("dummy_conf1", "dummy_conf2",
+        "huge_dummy_conf1", "huge_dummy_conf2");
+    verifyEntity(jobEventFile, null, false, true, cfgsToCheck);
 
     // for this test, we expect MR job metrics are published in YARN_APPLICATION
     String outputAppDir = basePath + "/YARN_APPLICATION/";
@@ -290,7 +307,8 @@ public class TestMRTimelineEventHandling {
         "appEventFilePath: " + appEventFilePath +
         " does not exist.",
         appEventFile.exists());
-    verifyMetricsWhenEvent(appEventFile, null);
+    verifyEntity(appEventFile, null, true, false, null);
+    verifyEntity(appEventFile, null, false, true, cfgsToCheck);
 
     // check for task event file
     String outputDirTask = basePath + "/MAPREDUCE_TASK/";
@@ -307,7 +325,8 @@ public class TestMRTimelineEventHandling {
     Assert.assertTrue("taskEventFileName: " + taskEventFilePath +
         " does not exist.",
         taskEventFile.exists());
-    verifyMetricsWhenEvent(taskEventFile, EventType.TASK_FINISHED.name());
+    verifyEntity(taskEventFile, EventType.TASK_FINISHED.name(),
+        true, false, null);
     
     // check for task attempt event file
     String outputDirTaskAttempt = basePath + "/MAPREDUCE_TASK_ATTEMPT/";
@@ -324,17 +343,30 @@ public class TestMRTimelineEventHandling {
     File taskAttemptEventFile = new File(taskAttemptEventFilePath);
     Assert.assertTrue("taskAttemptEventFileName: " + taskAttemptEventFilePath +
         " does not exist.", taskAttemptEventFile.exists());
-    verifyMetricsWhenEvent(taskAttemptEventFile,
-        EventType.MAP_ATTEMPT_FINISHED.name());
+    verifyEntity(taskAttemptEventFile, EventType.MAP_ATTEMPT_FINISHED.name(),
+        true, false, null);
   }
 
-  private void verifyMetricsWhenEvent(File entityFile, String eventId)
+  /**
+   * Verifies entity by reading the entity file written via FS impl.
+   * @param entityFile File to be read.
+   * @param eventId Event to be checked.
+   * @param chkMetrics If event is not null, this flag determines if metrics
+   *     exist when the event is encountered. If event is null, we merely check
+   *     if metrics exist in the entity file.
+   * @param chkCfg If event is not null, this flag determines if configs
+   *     exist when the event is encountered. If event is null, we merely check
+   *     if configs exist in the entity file.
+   * @param cfgsToVerify a set of configs which should exist in the entity file.
+   * @throws IOException
+   */
+  private void verifyEntity(File entityFile, String eventId,
+      boolean chkMetrics, boolean chkCfg, Set<String> cfgsToVerify)
       throws IOException {
     BufferedReader reader = null;
     String strLine;
     try {
       reader = new BufferedReader(new FileReader(entityFile));
-      boolean jobMetricsFoundForAppEntity = false;
       while ((strLine = reader.readLine()) != null) {
         if (strLine.trim().length() > 0) {
           org.apache.hadoop.yarn.api.records.timelineservice.TimelineEntity entity =
@@ -344,23 +376,57 @@ public class TestMRTimelineEventHandling {
           if (eventId == null) {
             // Job metrics are published without any events for
             // ApplicationEntity. There is also possibility that some other
-            // ApplicationEntity is published without events, hence loop all
-            if (entity.getEvents().size() == 0) {
-              jobMetricsFoundForAppEntity = entity.getMetrics().size() > 0;
-              if (jobMetricsFoundForAppEntity) {
+            // ApplicationEntity is published without events, hence loop till
+            // its found. Same applies to configs.
+            if (chkMetrics && entity.getMetrics().size() > 0) {
+              return;
+            }
+            if (chkCfg && entity.getConfigs().size() > 0) {
+              if (cfgsToVerify == null) {
                 return;
+              } else {
+                // Have configs to verify. Keep on removing configs from the set
+                // of configs to verify as they are found. When the all the
+                // entities have been looped through, we will check if the set
+                // is empty or not(indicating if all configs have been found or
+                // not).
+                for (Iterator<String> itr =
+                    cfgsToVerify.iterator(); itr.hasNext();) {
+                  String config = itr.next();
+                  if (entity.getConfigs().containsKey(config)) {
+                    itr.remove();
+                  }
+                }
+                // All the required configs have been verified, so return.
+                if (cfgsToVerify.isEmpty()) {
+                  return;
+                }
               }
             }
           } else {
             for (TimelineEvent event : entity.getEvents()) {
               if (event.getId().equals(eventId)) {
-                assertTrue(entity.getMetrics().size() > 0);
+                if (chkMetrics) {
+                  assertTrue(entity.getMetrics().size() > 0);
+                }
+                if (chkCfg) {
+                  assertTrue(entity.getConfigs().size() > 0);
+                  if (cfgsToVerify != null) {
+                    for (String cfg : cfgsToVerify) {
+                      assertTrue(entity.getConfigs().containsKey(cfg));
+                    }
+                  }
+                }
                 return;
               }
             }
           }
         }
       }
+      if (cfgsToVerify != null) {
+        assertTrue(cfgsToVerify.isEmpty());
+        return;
+      }
       fail("Expected event : " + eventId + " not found in the file "
           + entityFile);
     } finally {

http://git-wip-us.apache.org/repos/asf/hadoop/blob/000a4d8e/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/UtilsForTests.java
----------------------------------------------------------------------
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/UtilsForTests.java
b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/UtilsForTests.java
index cb494db..2fb6828 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/UtilsForTests.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/UtilsForTests.java
@@ -156,6 +156,14 @@ public class UtilsForTests {
     return buf.toString();
   }
 
+  public static String createConfigValue(int msgSize) {
+    StringBuilder sb = new StringBuilder(msgSize);
+    for (int i=0; i<msgSize; i++) {
+      sb.append('a');
+    }
+    return sb.toString();
+  }
+
   public static String safeGetCanonicalPath(File f) {
     try {
       String s = f.getCanonicalPath();


---------------------------------------------------------------------
To unsubscribe, e-mail: common-commits-unsubscribe@hadoop.apache.org
For additional commands, e-mail: common-commits-help@hadoop.apache.org


Mime
View raw message