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From rbalamo...@apache.org
Subject [2/2] tez git commit: TEZ-2076. Tez framework to extract/analyze data stored in ATS for specific dag (rbalamohan)
Date Tue, 19 May 2015 00:35:22 GMT
TEZ-2076. Tez framework to extract/analyze data stored in ATS for specific dag (rbalamohan)


Project: http://git-wip-us.apache.org/repos/asf/tez/repo
Commit: http://git-wip-us.apache.org/repos/asf/tez/commit/11aa17e0
Tree: http://git-wip-us.apache.org/repos/asf/tez/tree/11aa17e0
Diff: http://git-wip-us.apache.org/repos/asf/tez/diff/11aa17e0

Branch: refs/heads/master
Commit: 11aa17e01f7d72bdea26db2188f8b5cb0c3d84ae
Parents: 12fc2c7
Author: Rajesh Balamohan <rbalamohan@apache.org>
Authored: Tue May 19 06:05:18 2015 +0530
Committer: Rajesh Balamohan <rbalamohan@apache.org>
Committed: Tue May 19 06:05:18 2015 +0530

----------------------------------------------------------------------
 tez-plugins/pom.xml                             |   4 +
 .../tez-history-parser/findbugs-exclude.xml     |  16 +
 tez-plugins/tez-history-parser/pom.xml          | 190 +++++++
 .../org/apache/tez/history/ATSImportTool.java   | 474 ++++++++++++++++
 .../org/apache/tez/history/parser/ATSData.java  |  48 ++
 .../tez/history/parser/ATSFileParser.java       | 227 ++++++++
 .../datamodel/AdditionalInputOutputDetails.java |  71 +++
 .../tez/history/parser/datamodel/BaseInfo.java  | 142 +++++
 .../history/parser/datamodel/BaseParser.java    | 114 ++++
 .../tez/history/parser/datamodel/Constants.java |  59 ++
 .../tez/history/parser/datamodel/Container.java |  70 +++
 .../tez/history/parser/datamodel/DagInfo.java   | 555 +++++++++++++++++++
 .../tez/history/parser/datamodel/EdgeInfo.java  | 112 ++++
 .../tez/history/parser/datamodel/Event.java     |  63 +++
 .../parser/datamodel/TaskAttemptInfo.java       | 252 +++++++++
 .../tez/history/parser/datamodel/TaskInfo.java  | 341 ++++++++++++
 .../history/parser/datamodel/VersionInfo.java   |  45 ++
 .../history/parser/datamodel/VertexInfo.java    | 536 ++++++++++++++++++
 .../apache/tez/history/parser/utils/Utils.java  | 121 ++++
 .../apache/tez/history/TestATSFileParser.java   | 545 ++++++++++++++++++
 20 files changed, 3985 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/pom.xml
----------------------------------------------------------------------
diff --git a/tez-plugins/pom.xml b/tez-plugins/pom.xml
index 9b2a4cb..535007a 100644
--- a/tez-plugins/pom.xml
+++ b/tez-plugins/pom.xml
@@ -26,6 +26,10 @@
   <artifactId>tez-plugins</artifactId>
   <packaging>pom</packaging>
 
+  <modules>
+    <module>tez-history-parser</module>
+  </modules>
+
   <profiles>
     <profile>
       <id>hadoop24</id>

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/findbugs-exclude.xml
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/findbugs-exclude.xml b/tez-plugins/tez-history-parser/findbugs-exclude.xml
new file mode 100644
index 0000000..5b11308
--- /dev/null
+++ b/tez-plugins/tez-history-parser/findbugs-exclude.xml
@@ -0,0 +1,16 @@
+<!--
+  Licensed 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. See accompanying LICENSE file.
+-->
+<FindBugsFilter>
+
+</FindBugsFilter>

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/pom.xml
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/pom.xml b/tez-plugins/tez-history-parser/pom.xml
new file mode 100644
index 0000000..f12e0b4
--- /dev/null
+++ b/tez-plugins/tez-history-parser/pom.xml
@@ -0,0 +1,190 @@
+<!--
+   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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.apache.tez</groupId>
+    <artifactId>tez-plugins</artifactId>
+    <version>0.8.0-SNAPSHOT</version>
+  </parent>
+  <artifactId>tez-history-parser</artifactId>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.tez</groupId>
+      <artifactId>tez-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.tez</groupId>
+      <artifactId>tez-common</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.tez</groupId>
+      <artifactId>tez-dag</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.tez</groupId>
+      <artifactId>tez-tests</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.tez</groupId>
+      <artifactId>tez-tests</artifactId>
+      <type>test-jar</type>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.tez</groupId>
+      <artifactId>tez-yarn-timeline-history</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.tez</groupId>
+      <artifactId>tez-yarn-timeline-history</artifactId>
+      <scope>test</scope>
+      <type>test-jar</type>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-common</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-yarn-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-yarn-common</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-yarn-client</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-yarn-server-tests</artifactId>
+      <scope>test</scope>
+      <type>test-jar</type>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-hdfs</artifactId>
+      <scope>test</scope>
+      <type>test-jar</type>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-common</artifactId>
+      <scope>test</scope>
+      <type>test-jar</type>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-mapreduce-client-core</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-mapreduce-client-common</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-mapreduce-client-jobclient</artifactId>
+      <scope>test</scope>
+      <type>test-jar</type>
+    </dependency>
+    <dependency>
+      <groupId>org.codehaus.jettison</groupId>
+      <artifactId>jettison</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.google.guava</groupId>
+      <artifactId>guava</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-all</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>com.sun.jersey</groupId>
+      <artifactId>jersey-json</artifactId>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.rat</groupId>
+        <artifactId>apache-rat-plugin</artifactId>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-deploy-plugin</artifactId>
+        <configuration>
+          <skip>true</skip>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <configuration>
+          <archive>
+            <manifest>
+              <mainClass>org.apache.tez.history.ATSImportTool</mainClass>
+            </manifest>
+          </archive>
+        </configuration>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <configuration>
+          <descriptorRefs>
+            <descriptorRef>jar-with-dependencies</descriptorRef>
+          </descriptorRefs>
+          <archive>
+            <manifest>
+              <addClasspath>true</addClasspath>
+              <mainClass>org.apache.tez.history.ATSImportTool</mainClass>
+            </manifest>
+          </archive>
+        </configuration>
+        <executions>
+          <execution>
+            <id>assemble-all</id>
+            <phase>package</phase>
+            <goals>
+              <goal>single</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/ATSImportTool.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/ATSImportTool.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/ATSImportTool.java
new file mode 100644
index 0000000..3545cec
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/ATSImportTool.java
@@ -0,0 +1,474 @@
+/**
+ * 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.tez.history;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Joiner;
+import com.google.common.base.Preconditions;
+import com.sun.jersey.api.client.Client;
+import com.sun.jersey.api.client.ClientHandlerException;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.UniformInterfaceException;
+import com.sun.jersey.api.client.WebResource;
+import com.sun.jersey.api.client.config.ClientConfig;
+import com.sun.jersey.api.client.config.DefaultClientConfig;
+import com.sun.jersey.client.urlconnection.HttpURLConnectionFactory;
+import com.sun.jersey.client.urlconnection.URLConnectionClientHandler;
+import com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider;
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.GnuParser;
+import org.apache.commons.cli.HelpFormatter;
+import org.apache.commons.cli.MissingOptionException;
+import org.apache.commons.cli.Option;
+import org.apache.commons.cli.OptionBuilder;
+import org.apache.commons.cli.Options;
+import org.apache.commons.cli.ParseException;
+import org.apache.commons.io.IOUtils;
+import org.apache.commons.io.LineIterator;
+import org.apache.directory.api.util.Strings;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.conf.Configured;
+import org.apache.hadoop.http.HttpConfig;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.util.Tool;
+import org.apache.hadoop.util.ToolRunner;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.tez.dag.api.TezException;
+import org.apache.tez.dag.records.TezDAGID;
+import org.apache.tez.history.parser.datamodel.Constants;
+import org.apache.tez.history.parser.utils.Utils;
+import org.codehaus.jettison.json.JSONArray;
+import org.codehaus.jettison.json.JSONException;
+import org.codehaus.jettison.json.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.ws.rs.core.MediaType;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.net.URLEncoder;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+import static org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+/**
+ * <pre>
+ * Simple tool which imports ATS data pertaining to a DAG (Dag, Vertex, Task, Attempt)
+ * and creates a zip file out of it.
+ *
+ * usage:
+ *
+ * java -cp tez-history-parser-x.y.z-jar-with-dependencies.jar org.apache.tez.history.ATSImportTool
+ *
+ * OR
+ *
+ * HADOOP_CLASSPATH=$TEZ_HOME/*:$TEZ_HOME/lib/*:$HADOOP_CLASSPATH hadoop jar tez-history-parser-x.y.z.jar org.apache.tez.history.ATSImportTool
+ *
+ *
+ * --yarnTimelineAddress <yarnTimelineAddress>  Optional. Yarn Timeline Address(e.g http://clusterATSNode:8188)
+ * --batchSize <batchSize>       Optional. batch size for downloading data
+ * --dagId <dagId>               DagId that needs to be downloaded
+ * --downloadDir <downloadDir>   download directory where data needs to be downloaded
+ * --help                        print help
+ *
+ * </pre>
+ */
+@Evolving
+public class ATSImportTool extends Configured implements Tool {
+
+  private static final Logger LOG = LoggerFactory.getLogger(ATSImportTool.class);
+
+  private static final String BATCH_SIZE = "batchSize";
+  private static final int BATCH_SIZE_DEFAULT = 100;
+
+  private static final String YARN_TIMELINE_SERVICE_ADDRESS = "yarnTimelineAddress";
+  private static final String DAG_ID = "dagId";
+  private static final String BASE_DOWNLOAD_DIR = "downloadDir";
+
+  private static final String HTTPS_SCHEME = "https://";
+  private static final String HTTP_SCHEME = "http://";
+
+  private static final String VERTEX_QUERY_STRING = "%s/%s?limit=%s&primaryFilter=%s:%s";
+  private static final String TASK_QUERY_STRING = "%s/%s?limit=%s&primaryFilter=%s:%s";
+  private static final String TASK_ATTEMPT_QUERY_STRING = "%s/%s?limit=%s&primaryFilter=%s:%s";
+  private static final String UTF8 = "UTF-8";
+
+  private static final String LINE_SEPARATOR = System.getProperty("line.separator");
+
+  private final int batchSize;
+  private final String baseUri;
+  private final String dagId;
+
+  private final File downloadDir;
+  private final File zipFile;
+  private final Client httpClient;
+
+  public ATSImportTool(String baseUri, String dagId, File baseDownloadDir, int batchSize)
+      throws TezException {
+    Preconditions.checkArgument(!Strings.isEmpty(dagId), "dagId can not be null or empty");
+    Preconditions.checkArgument(baseDownloadDir != null, "downloadDir can not be null");
+    Preconditions.checkArgument(TezDAGID.fromString(dagId) != null, "Not a valid DAG ID " + dagId);
+
+    this.baseUri = baseUri;
+    this.batchSize = batchSize;
+    this.dagId = dagId;
+
+    this.httpClient = getHttpClient();
+
+    this.downloadDir = new File(baseDownloadDir, dagId);
+    this.zipFile = new File(downloadDir, this.dagId + ".zip");
+
+    boolean result = downloadDir.mkdirs();
+    LOG.trace("Result of creating dir {}={}", downloadDir, result);
+    if (!downloadDir.exists()) {
+      throw new IllegalArgumentException("dir=" + downloadDir + " does not exist");
+    }
+
+    LOG.info("Using baseURL={}, dagId={}, batchSize={}, downloadDir={}", baseUri, dagId,
+        batchSize, downloadDir);
+  }
+
+  /**
+   * Download data from ATS for specific DAG
+   *
+   * @throws Exception
+   */
+  private void download() throws Exception {
+    FileOutputStream fos = null;
+    try {
+      fos = new FileOutputStream(zipFile, false);
+      ZipOutputStream zos = new ZipOutputStream(fos);
+      downloadData(zos);
+      IOUtils.closeQuietly(zos);
+    } catch (Exception e) {
+      LOG.error("Exception in download", e);
+      throw e;
+    } finally {
+      if (httpClient != null) {
+        httpClient.destroy();
+      }
+      IOUtils.closeQuietly(fos);
+    }
+  }
+
+  /**
+   * Download DAG data (DAG, Vertex, Task, TaskAttempts) from ATS and write to zip file
+   *
+   * @param zos
+   * @throws TezException
+   * @throws JSONException
+   * @throws IOException
+   */
+  private void downloadData(ZipOutputStream zos) throws TezException, JSONException, IOException {
+    JSONObject finalJson = new JSONObject();
+
+    //Download application details (TEZ_VERSION etc)
+    String tezAppId = "tez_" + (TezDAGID.fromString(dagId)).getApplicationId().toString();
+    String tezAppUrl = String.format("%s/%s/%s", baseUri, Constants.TEZ_APPLICATION, tezAppId);
+    JSONObject tezAppJson = getJsonRootEntity(tezAppUrl);
+    finalJson.put(Constants.APPLICATION, tezAppJson);
+
+    //Download dag
+    String dagUrl = String.format("%s/%s/%s", baseUri, Constants.TEZ_DAG_ID, dagId);
+    JSONObject dagRoot = getJsonRootEntity(dagUrl);
+    finalJson.put(Constants.DAG, dagRoot);
+
+    //Create a zip entry with dagId as its name.
+    ZipEntry zipEntry = new ZipEntry(dagId);
+    zos.putNextEntry(zipEntry);
+    //Write in formatted way
+    IOUtils.write(finalJson.toString(4), zos, UTF8);
+
+    //Download vertex
+    String vertexURL =
+        String.format(VERTEX_QUERY_STRING, baseUri,
+            Constants.TEZ_VERTEX_ID, batchSize, Constants.TEZ_DAG_ID, dagId);
+    downloadJSONArrayFromATS(vertexURL, zos, Constants.VERTICES);
+
+    //Download task
+    String taskURL = String.format(TASK_QUERY_STRING, baseUri,
+        Constants.TEZ_TASK_ID, batchSize, Constants.TEZ_DAG_ID, dagId);
+    downloadJSONArrayFromATS(taskURL, zos, Constants.TASKS);
+
+    //Download task attempts
+    String taskAttemptURL = String.format(TASK_ATTEMPT_QUERY_STRING, baseUri,
+        Constants.TEZ_TASK_ATTEMPT_ID, batchSize, Constants.TEZ_DAG_ID, dagId);
+    downloadJSONArrayFromATS(taskAttemptURL, zos, Constants.TASK_ATTEMPTS);
+  }
+
+  /**
+   * Download data from ATS in batches
+   *
+   * @param url
+   * @param zos
+   * @param tag
+   * @throws IOException
+   * @throws TezException
+   * @throws JSONException
+   */
+  private void downloadJSONArrayFromATS(String url, ZipOutputStream zos, String tag)
+      throws IOException, TezException, JSONException {
+
+    Preconditions.checkArgument(zos != null, "ZipOutputStream can not be null");
+
+    String baseUrl = url;
+    JSONArray entities;
+
+    long downloadedCount = 0;
+    while ((entities = getJsonRootEntity(url).optJSONArray(Constants.ENTITIES)) != null
+        && entities.length() > 0) {
+
+      int limit = (entities.length() >= batchSize) ? (entities.length() - 1) : entities.length();
+      LOG.debug("Limit={}, downloaded entities len={}", limit, entities.length());
+
+      //write downloaded part to zipfile.  This is done to avoid any memory pressure when
+      // downloading and writing 1000s of tasks.
+      ZipEntry zipEntry = new ZipEntry("part-" + System.currentTimeMillis() + ".json");
+      zos.putNextEntry(zipEntry);
+      JSONObject finalJson = new JSONObject();
+      finalJson.put(tag, entities);
+      IOUtils.write(finalJson.toString(4), zos, "UTF-8");
+      downloadedCount += entities.length();
+
+      if (entities.length() < batchSize) {
+        break;
+      }
+
+      //Set the last item in entities as the fromId
+      url = baseUrl + "&fromId="
+          + entities.getJSONObject(entities.length() - 1).getString(Constants.ENTITY);
+
+      String firstItem = entities.getJSONObject(0).getString(Constants.ENTITY);
+      String lastItem = entities.getJSONObject(entities.length() - 1).getString(Constants.ENTITY);
+      LOG.info("Downloaded={}, First item={}, LastItem={}, new url={}", downloadedCount,
+          firstItem, lastItem, url);
+    }
+  }
+
+  private String logErrorMessage(ClientResponse response) throws IOException {
+    StringBuilder sb = new StringBuilder();
+    LOG.error("Response status={}", response.getClientResponseStatus().toString());
+    LineIterator it = null;
+    try {
+      it = IOUtils.lineIterator(response.getEntityInputStream(), UTF8);
+      while (it.hasNext()) {
+        String line = it.nextLine();
+        LOG.error(line);
+      }
+    } finally {
+      if (it != null) {
+        it.close();
+      }
+    }
+    return sb.toString();
+  }
+
+  //For secure cluster, this should work as long as valid ticket is available in the node.
+  private JSONObject getJsonRootEntity(String url) throws TezException, IOException {
+    try {
+      WebResource wr = getHttpClient().resource(url);
+      ClientResponse response = wr.accept(MediaType.APPLICATION_JSON_TYPE)
+          .type(MediaType.APPLICATION_JSON_TYPE)
+          .get(ClientResponse.class);
+
+      if (response.getClientResponseStatus() != ClientResponse.Status.OK) {
+        // In the case of secure cluster, if there is any auth exception it sends the data back as
+        // a html page and JSON parsing could throw exceptions. Instead, get the stream contents
+        // completely and log it in case of error.
+        logErrorMessage(response);
+        throw new TezException("Failed to get response from YARN Timeline: url: " + url);
+      }
+      return response.getEntity(JSONObject.class);
+    } catch (ClientHandlerException e) {
+      throw new TezException("Error processing response from YARN Timeline. URL=" + url, e);
+    } catch (UniformInterfaceException e) {
+      throw new TezException("Error accessing content from YARN Timeline - unexpected response. "
+          + "URL=" + url, e);
+    } catch (IllegalArgumentException e) {
+      throw new TezException("Error accessing content from YARN Timeline - invalid url. URL=" + url,
+          e);
+    }
+  }
+
+  private Client getHttpClient() {
+    if (httpClient == null) {
+      ClientConfig config = new DefaultClientConfig(JSONRootElementProvider.App.class);
+      HttpURLConnectionFactory urlFactory = new PseudoAuthenticatedURLConnectionFactory();
+      return new Client(new URLConnectionClientHandler(urlFactory), config);
+    }
+    return httpClient;
+  }
+
+  static class PseudoAuthenticatedURLConnectionFactory implements HttpURLConnectionFactory {
+    @Override
+    public HttpURLConnection getHttpURLConnection(URL url) throws IOException {
+      String tokenString = (url.getQuery() == null ? "?" : "&") + "user.name=" +
+          URLEncoder.encode(UserGroupInformation.getCurrentUser().getShortUserName(), "UTF8");
+      return (HttpURLConnection) (new URL(url.toString() + tokenString)).openConnection();
+    }
+  }
+
+  @Override
+  public int run(String[] args) throws Exception {
+    try {
+      download();
+      return 0;
+    } catch (Exception e) {
+      e.printStackTrace();
+      LOG.error("Error occurred when downloading data ", e);
+      return -1;
+    }
+  }
+
+  private static Options buildOptions() {
+    Option dagIdOption = OptionBuilder.withArgName(DAG_ID).withLongOpt(DAG_ID)
+        .withDescription("DagId that needs to be downloaded").hasArg().isRequired(true).create();
+
+    Option downloadDirOption = OptionBuilder.withArgName(BASE_DOWNLOAD_DIR).withLongOpt
+        (BASE_DOWNLOAD_DIR)
+        .withDescription("Download directory where data needs to be downloaded").hasArg()
+        .isRequired(true).create();
+
+    Option atsAddressOption = OptionBuilder.withArgName(YARN_TIMELINE_SERVICE_ADDRESS).withLongOpt(
+        YARN_TIMELINE_SERVICE_ADDRESS)
+        .withDescription("Optional. ATS address (e.g http://clusterATSNode:8188)").hasArg()
+        .isRequired(false)
+        .create();
+
+    Option batchSizeOption = OptionBuilder.withArgName(BATCH_SIZE).withLongOpt(BATCH_SIZE)
+        .withDescription("Optional. batch size for downloading data").hasArg()
+        .isRequired(false)
+        .create();
+
+    Option help = OptionBuilder.withArgName("help").withLongOpt("help")
+        .withDescription("print help").isRequired(false).create();
+
+    Options opts = new Options();
+    opts.addOption(dagIdOption);
+    opts.addOption(downloadDirOption);
+    opts.addOption(atsAddressOption);
+    opts.addOption(batchSizeOption);
+    opts.addOption(help);
+    return opts;
+  }
+
+  static void printHelp(Options options) {
+    HelpFormatter formatter = new HelpFormatter();
+    formatter.setWidth(240);
+    String help = LINE_SEPARATOR
+        + "java -cp tez-history-parser-x.y.z-jar-with-dependencies.jar org.apache.tez.history.ATSImportTool"
+        + LINE_SEPARATOR
+        + "OR"
+        + LINE_SEPARATOR
+        + "HADOOP_CLASSPATH=$TEZ_HOME/*:$TEZ_HOME/lib/*:$HADOOP_CLASSPATH hadoop jar "
+        + "tez-history-parser-x.y.z.jar " + ATSImportTool.class.getName()
+        + LINE_SEPARATOR;
+    formatter.printHelp(240, help, "Options", options, "", true);
+  }
+
+  static boolean hasHttpsPolicy(Configuration conf) {
+    YarnConfiguration yarnConf = new YarnConfiguration(conf);
+    return (HttpConfig.Policy.HTTPS_ONLY == HttpConfig.Policy.fromString(yarnConf
+        .get(YarnConfiguration.YARN_HTTP_POLICY_KEY, YarnConfiguration.YARN_HTTP_POLICY_DEFAULT)));
+  }
+
+  static String getBaseTimelineURL(String yarnTimelineAddress, Configuration conf)
+      throws TezException {
+    boolean isHttps = hasHttpsPolicy(conf);
+
+    if (yarnTimelineAddress == null) {
+      if (isHttps) {
+        yarnTimelineAddress = conf.get(Constants.TIMELINE_SERVICE_WEBAPP_HTTPS_ADDRESS_CONF_NAME);
+      } else {
+        yarnTimelineAddress = conf.get(Constants.TIMELINE_SERVICE_WEBAPP_HTTP_ADDRESS_CONF_NAME);
+      }
+      Preconditions.checkArgument(!Strings.isEmpty(yarnTimelineAddress), "Yarn timeline address can"
+          + " not be empty. Please check configurations.");
+    } else {
+      yarnTimelineAddress = yarnTimelineAddress.trim();
+      Preconditions.checkArgument(!Strings.isEmpty(yarnTimelineAddress), "Yarn timeline address can"
+          + " not be empty. Please provide valid url with --" +
+          YARN_TIMELINE_SERVICE_ADDRESS + " option");
+    }
+
+    yarnTimelineAddress = yarnTimelineAddress.toLowerCase();
+    if (!yarnTimelineAddress.startsWith(HTTP_SCHEME)
+        && !yarnTimelineAddress.startsWith(HTTPS_SCHEME)) {
+      yarnTimelineAddress = ((isHttps) ? HTTPS_SCHEME : HTTP_SCHEME) + yarnTimelineAddress;
+    }
+
+    try {
+      yarnTimelineAddress = new URI(yarnTimelineAddress).normalize().toString().trim();
+      yarnTimelineAddress = (yarnTimelineAddress.endsWith("/")) ?
+          yarnTimelineAddress.substring(0, yarnTimelineAddress.length() - 1) :
+          yarnTimelineAddress;
+    } catch (URISyntaxException e) {
+      throw new TezException("Please provide a valid URL. url=" + yarnTimelineAddress, e);
+    }
+
+    return Joiner.on("").join(yarnTimelineAddress, Constants.RESOURCE_URI_BASE);
+  }
+
+  @VisibleForTesting
+  static int process(String[] args) {
+    Options options = buildOptions();
+    int result = -1;
+    try {
+      Configuration conf = new Configuration();
+      CommandLine cmdLine = new GnuParser().parse(options, args);
+      String dagId = cmdLine.getOptionValue(DAG_ID);
+
+      File downloadDir = new File(cmdLine.getOptionValue(BASE_DOWNLOAD_DIR));
+
+      String yarnTimelineAddress = cmdLine.getOptionValue(YARN_TIMELINE_SERVICE_ADDRESS);
+      String baseTimelineURL = getBaseTimelineURL(yarnTimelineAddress, conf);
+
+      int batchSize = (cmdLine.hasOption(BATCH_SIZE)) ?
+          (Integer.parseInt(cmdLine.getOptionValue(BATCH_SIZE))) : BATCH_SIZE_DEFAULT;
+
+      result = ToolRunner.run(conf, new ATSImportTool(baseTimelineURL, dagId,
+          downloadDir, batchSize), args);
+
+      return result;
+    } catch (MissingOptionException missingOptionException) {
+      LOG.error("Error in parsing options ", missingOptionException);
+      printHelp(options);
+    } catch (ParseException e) {
+      LOG.error("Error in parsing options ", e);
+      printHelp(options);
+    } catch (Exception e) {
+      LOG.error("Error in processing ", e);
+      throw e;
+    } finally {
+      return result;
+    }
+  }
+
+  public static void main(String[] args) throws Exception {
+    Utils.setupRootLogger();
+    int res = process(args);
+    System.exit(res);
+  }
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/ATSData.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/ATSData.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/ATSData.java
new file mode 100644
index 0000000..f504007
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/ATSData.java
@@ -0,0 +1,48 @@
+/**
+ * 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.tez.history.parser;
+
+import org.apache.tez.dag.api.TezException;
+import org.apache.tez.history.parser.datamodel.DagInfo;
+import org.codehaus.jettison.json.JSONException;
+
+import static org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+/**
+ * Main interface to pull data from ATS.
+ * <p/>
+ * It is possible that to have ATS data store in any DB (e.g LevelDB or HBase).  Depending on
+ * store, there can be multiple implementations to pull data from these stores and create the
+ * DagInfo object for analysis.
+ * <p/>
+ */
+@Evolving
+public interface ATSData {
+
+  /**
+   * Get the DAG representation for processing
+   *
+   * @param dagId
+   * @return DagInfo
+   * @throws JSONException
+   * @throws TezException
+   */
+  public DagInfo getDAGData(String dagId) throws TezException;
+
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/ATSFileParser.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/ATSFileParser.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/ATSFileParser.java
new file mode 100644
index 0000000..aae20eb
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/ATSFileParser.java
@@ -0,0 +1,227 @@
+/**
+ * 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.tez.history.parser;
+
+import com.google.common.base.Preconditions;
+import org.apache.commons.io.IOUtils;
+import org.apache.tez.dag.api.TezException;
+import org.apache.tez.history.parser.datamodel.BaseParser;
+import org.apache.tez.history.parser.datamodel.Constants;
+import org.apache.tez.history.parser.datamodel.DagInfo;
+import org.apache.tez.history.parser.datamodel.TaskAttemptInfo;
+import org.apache.tez.history.parser.datamodel.TaskInfo;
+import org.apache.tez.history.parser.datamodel.VersionInfo;
+import org.apache.tez.history.parser.datamodel.VertexInfo;
+import org.codehaus.jettison.json.JSONArray;
+import org.codehaus.jettison.json.JSONException;
+import org.codehaus.jettison.json.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Enumeration;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
+import static org.apache.hadoop.classification.InterfaceAudience.Public;
+import static org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+/**
+ * Simple class to parse ATS zip file of a DAG and generate the relevant in-memory structure
+ * (DagInfo) necessary for processing later.
+ */
+
+@Public
+@Evolving
+public class ATSFileParser extends BaseParser implements ATSData {
+
+  private static final Logger LOG = LoggerFactory.getLogger(ATSFileParser.class);
+
+  private final File atsZipFile;
+
+  public ATSFileParser(File atsZipFile) throws TezException {
+    super();
+    Preconditions.checkArgument(atsZipFile.exists(), "Zipfile " + atsZipFile + " does not exist");
+    this.atsZipFile = atsZipFile;
+  }
+
+  @Override
+  public DagInfo getDAGData(String dagId) throws TezException {
+    try {
+      parseATSZipFile(atsZipFile);
+
+      linkParsedContents();
+
+      return dagInfo;
+    } catch (IOException e) {
+      LOG.error("Error in reading DAG ", e);
+      throw new TezException(e);
+    } catch (JSONException e) {
+      LOG.error("Error in parsing DAG ", e);
+      throw new TezException(e);
+    } catch (InterruptedException e) {
+      throw new TezException(e);
+    }
+  }
+
+  /**
+   * Parse vertices json
+   *
+   * @param verticesJson
+   * @throws JSONException
+   */
+  private void processVertices(JSONArray verticesJson) throws JSONException {
+    //Process vertex information
+    Preconditions.checkState(verticesJson != null, "Vertex json can not be null");
+    if (verticesJson != null) {
+      LOG.info("Started parsing vertex");
+      for (int i = 0; i < verticesJson.length(); i++) {
+        VertexInfo vertexInfo = VertexInfo.create(verticesJson.getJSONObject(i));
+        vertexList.add(vertexInfo);
+      }
+      LOG.info("Finished parsing vertex");
+    }
+  }
+
+  /**
+   * Parse Tasks json
+   *
+   * @param tasksJson
+   * @throws JSONException
+   */
+  private void processTasks(JSONArray tasksJson) throws JSONException {
+    //Process Task information
+    Preconditions.checkState(tasksJson != null, "Task json can not be null");
+    if (tasksJson != null) {
+      LOG.debug("Started parsing task");
+      for (int i = 0; i < tasksJson.length(); i++) {
+        TaskInfo taskInfo = TaskInfo.create(tasksJson.getJSONObject(i));
+        taskList.add(taskInfo);
+      }
+      LOG.debug("Finished parsing task");
+    }
+  }
+
+  /**
+   * Parse TaskAttempt json
+   *
+   * @param taskAttemptsJson
+   * @throws JSONException
+   */
+  private void processAttempts(JSONArray taskAttemptsJson) throws JSONException {
+    //Process TaskAttempt information
+    Preconditions.checkState(taskAttemptsJson != null, "Attempts json can not be null");
+    if (taskAttemptsJson != null) {
+      LOG.debug("Started parsing task attempts");
+      for (int i = 0; i < taskAttemptsJson.length(); i++) {
+        TaskAttemptInfo attemptInfo = TaskAttemptInfo.create(taskAttemptsJson.getJSONObject(i));
+        attemptList.add(attemptInfo);
+      }
+      LOG.debug("Finished parsing task attempts");
+    }
+  }
+
+  /**
+   * Parse TezApplication json
+   *
+   * @param tezApplicationJson
+   * @throws JSONException
+   */
+  private void processApplication(JSONObject tezApplicationJson) throws JSONException {
+    if (tezApplicationJson != null) {
+      LOG.debug("Started parsing tez application");
+      JSONObject otherInfoNode = tezApplicationJson.optJSONObject(Constants.OTHER_INFO);
+      if (otherInfoNode != null) {
+        JSONObject tezVersion = otherInfoNode.optJSONObject(Constants.TEZ_VERSION);
+        if (tezVersion != null) {
+          String version = tezVersion.optString(Constants.VERSION);
+          String buildTime = tezVersion.optString(Constants.BUILD_TIME);
+          String revision = tezVersion.optString(Constants.REVISION);
+          this.versionInfo = new VersionInfo(version, buildTime, revision);
+        }
+        //TODO: might need to parse config info? (e.g, hive settings etc. could consume memory)
+      }
+      LOG.debug("Finished parsing tez application");
+    }
+  }
+
+  private JSONObject readJson(InputStream in) throws IOException, JSONException {
+    //Read entire content to memory
+    final ByteArrayOutputStream bout = new ByteArrayOutputStream();
+    IOUtils.copy(in, bout);
+    return new JSONObject(new String(bout.toByteArray(), "UTF-8"));
+  }
+
+  /**
+   * Read zip file contents. Every file can contain "dag", "vertices", "tasks", "task_attempts"
+   *
+   * @param atsFile
+   * @throws IOException
+   * @throws JSONException
+   */
+  private void parseATSZipFile(File atsFile)
+      throws IOException, JSONException, TezException, InterruptedException {
+    final ZipFile atsZipFile = new ZipFile(atsFile);
+    try {
+      Enumeration<? extends ZipEntry> zipEntries = atsZipFile.entries();
+      while (zipEntries.hasMoreElements()) {
+        ZipEntry zipEntry = zipEntries.nextElement();
+        LOG.info("Processing " + zipEntry.getName());
+        InputStream inputStream = atsZipFile.getInputStream(zipEntry);
+        JSONObject jsonObject = readJson(inputStream);
+
+        //This json can contain dag, vertices, tasks, task_attempts
+        JSONObject dagJson = jsonObject.optJSONObject(Constants.DAG);
+        if (dagJson != null) {
+          //TODO: support for multiple dags per ATS file later.
+          dagInfo = DagInfo.create(dagJson);
+        }
+
+        //Process vertex
+        JSONArray vertexJson = jsonObject.optJSONArray(Constants.VERTICES);
+        if (vertexJson != null) {
+          processVertices(vertexJson);
+        }
+
+        //Process task
+        JSONArray taskJson = jsonObject.optJSONArray(Constants.TASKS);
+        if (taskJson != null) {
+          processTasks(taskJson);
+        }
+
+        //Process task attempts
+        JSONArray attemptsJson = jsonObject.optJSONArray(Constants.TASK_ATTEMPTS);
+        if (attemptsJson != null) {
+          processAttempts(attemptsJson);
+        }
+
+        //Process application (mainly versionInfo)
+        JSONObject tezAppJson = jsonObject.optJSONObject(Constants.APPLICATION);
+        if (tezAppJson != null) {
+          processApplication(tezAppJson);
+        }
+      }
+    } finally {
+      atsZipFile.close();
+    }
+  }
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/AdditionalInputOutputDetails.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/AdditionalInputOutputDetails.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/AdditionalInputOutputDetails.java
new file mode 100644
index 0000000..b853d5c
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/AdditionalInputOutputDetails.java
@@ -0,0 +1,71 @@
+/**
+ * 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.tez.history.parser.datamodel;
+
+import static org.apache.hadoop.classification.InterfaceAudience.Public;
+import static org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+/**
+ * Additional input/ouput information present in DAG.
+ */
+
+@Public
+@Evolving
+public class AdditionalInputOutputDetails {
+  private final String name;
+  private final String clazz;
+  private final String initializer;
+  private final String userPayloadText;
+
+  public AdditionalInputOutputDetails(String name, String clazz, String initializer,
+      String userPayloadText) {
+    this.name = name;
+    this.clazz = clazz;
+    this.initializer = initializer;
+    this.userPayloadText = userPayloadText;
+  }
+
+  public final String getName() {
+    return name;
+  }
+
+  public final String getClazz() {
+    return clazz;
+  }
+
+  public final String getInitializer() {
+    return initializer;
+  }
+
+  public final String getUserPayloadText() {
+    return userPayloadText;
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("[");
+    sb.append("name=").append(name).append(", ");
+    sb.append("clazz=").append(clazz).append(", ");
+    sb.append("initializer=").append(initializer).append(", ");
+    sb.append("userPayloadText=").append(userPayloadText);
+    sb.append("]");
+    return sb.toString();
+  }
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/BaseInfo.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/BaseInfo.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/BaseInfo.java
new file mode 100644
index 0000000..8bd6bfb
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/BaseInfo.java
@@ -0,0 +1,142 @@
+/**
+ * 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.tez.history.parser.datamodel;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import org.apache.tez.common.counters.CounterGroup;
+import org.apache.tez.common.counters.TezCounter;
+import org.apache.tez.common.counters.TezCounters;
+import org.apache.tez.history.parser.utils.Utils;
+import org.codehaus.jettison.json.JSONException;
+import org.codehaus.jettison.json.JSONObject;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import static org.apache.hadoop.classification.InterfaceAudience.Public;
+import static org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+@Public
+@Evolving
+public abstract class BaseInfo {
+
+  protected TezCounters tezCounters;
+  protected List<Event> eventList;
+
+  BaseInfo(JSONObject jsonObject) throws JSONException {
+    final JSONObject otherInfoNode = jsonObject.getJSONObject(Constants.OTHER_INFO);
+    //parse tez counters
+    tezCounters = Utils.parseTezCountersFromJSON(
+        otherInfoNode.optJSONObject(Constants.COUNTERS));
+
+    //parse events
+    eventList = Lists.newArrayList();
+    Utils.parseEvents(jsonObject.optJSONArray(Constants.EVENTS), eventList);
+  }
+
+  public TezCounters getTezCounters() {
+    return tezCounters;
+  }
+
+  /**
+   * Get start time w.r.t DAG
+   *
+   * @return long
+   */
+  public abstract long getStartTime();
+
+  /**
+   * Get finish time w.r.t DAG
+   *
+   * @return long
+   */
+  public abstract long getFinishTime();
+
+  /**
+   * Get absolute start time
+   *
+   * @return long
+   */
+  public abstract long getAbsStartTime();
+
+  /**
+   * Get absolute finish time
+   *
+   * @return long
+   */
+  public abstract long getAbsFinishTime();
+
+  public abstract String getDiagnostics();
+
+  public List<Event> getEvents() {
+    return eventList;
+  }
+
+  /**
+   * Get counter for a specific counter group name.
+   * If counterGroupName is not mentioned, it would end up returning counter found in all
+   * groups
+   *
+   * @param counterGroupName
+   * @param counter
+   * @return Map<String, TezCounter> tez counter at every counter group level
+   */
+  public Map<String, TezCounter> getCounter(String counterGroupName, String counter) {
+    //TODO: FS, TaskCounters are directly getting added as TezCounters always pass those.  Need a
+    // way to get rid of these.
+    Map<String, TezCounter> result = Maps.newHashMap();
+    Iterator<String> iterator = tezCounters.getGroupNames().iterator();
+    boolean found = false;
+    while (iterator.hasNext()) {
+      CounterGroup counterGroup = tezCounters.getGroup(iterator.next());
+      if (counterGroupName != null) {
+        String groupName = counterGroup.getName();
+        if (groupName.equals(counterGroupName)) {
+          found = true;
+        }
+      }
+
+      //Explicitly mention that no need to create the counter if not present
+      TezCounter tezCounter = counterGroup.getUnderlyingGroup().findCounter(counter, false);
+      if (tezCounter != null) {
+        result.put(counterGroup.getName(), tezCounter);
+      }
+
+      if (found) {
+        //Retrieved counter specific to a counter group. Safe to exit.
+        break;
+      }
+
+    }
+    return result;
+  }
+
+  /**
+   * Find a counter in all counter groups
+   *
+   * @param counter
+   * @return Map of countergroup to TezCounter mapping
+   */
+  public Map<String, TezCounter> getCounter(String counter) {
+    return getCounter(null, counter);
+  }
+
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/BaseParser.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/BaseParser.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/BaseParser.java
new file mode 100644
index 0000000..a484bd5
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/BaseParser.java
@@ -0,0 +1,114 @@
+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.tez.history.parser.datamodel;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Predicate;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Lists;
+import org.apache.tez.dag.records.TezTaskAttemptID;
+import org.apache.tez.dag.records.TezTaskID;
+
+import java.util.List;
+
+public abstract class BaseParser {
+
+  protected DagInfo dagInfo;
+  protected VersionInfo versionInfo;
+  protected final List<VertexInfo> vertexList;
+  protected final List<TaskInfo> taskList;
+  protected final List<TaskAttemptInfo> attemptList;
+
+
+  public BaseParser() {
+    vertexList = Lists.newLinkedList();
+    taskList = Lists.newLinkedList();
+    attemptList = Lists.newLinkedList();
+  }
+
+  /**
+   * link the parsed contents, so that it becomes easier to iterate from DAG-->Task and Task--DAG.
+   * e.g Link vertex to dag, task to vertex, attempt to task etc
+   */
+  protected void linkParsedContents() {
+    //Link vertex to DAG
+    for (VertexInfo vertexInfo : vertexList) {
+      vertexInfo.setDagInfo(dagInfo);
+    }
+
+    //Link task to vertex
+    for (TaskInfo taskInfo : taskList) {
+      //Link vertex to task
+      String vertexId = TezTaskID.fromString(taskInfo.getTaskId()).getVertexID().toString();
+      VertexInfo vertexInfo = dagInfo.getVertexFromId(vertexId);
+      Preconditions.checkState(vertexInfo != null, "VertexInfo for " + vertexId + " can't be "
+          + "null");
+      taskInfo.setVertexInfo(vertexInfo);
+    }
+
+    //Link task attempt to task
+    for (TaskAttemptInfo attemptInfo : attemptList) {
+      //Link task to task attempt
+      TezTaskAttemptID taskAttemptId = TezTaskAttemptID.fromString(attemptInfo
+          .getTaskAttemptId());
+      VertexInfo vertexInfo = dagInfo.getVertexFromId(taskAttemptId.getTaskID()
+          .getVertexID().toString());
+      Preconditions.checkState(vertexInfo != null, "Vertex " + taskAttemptId.getTaskID()
+          .getVertexID().toString() + " is not present in DAG");
+      TaskInfo taskInfo = vertexInfo.getTask(taskAttemptId.getTaskID().toString());
+      attemptInfo.setTaskInfo(taskInfo);
+    }
+
+    //Set container details
+    for (VertexInfo vertexInfo : dagInfo.getVertices()) {
+      for (TaskAttemptInfo taskAttemptInfo : vertexInfo.getTaskAttempts()) {
+        dagInfo.addContainerMapping(taskAttemptInfo.getContainer(), taskAttemptInfo);
+      }
+    }
+
+
+    //Set reference time for all events
+    for (VertexInfo vertexInfo : dagInfo.getVertices()) {
+      setReferenceTime(vertexInfo.getEvents(), dagInfo.getStartTime());
+      for (TaskInfo taskInfo : vertexInfo.getTasks()) {
+        setReferenceTime(taskInfo.getEvents(), dagInfo.getStartTime());
+        for (TaskAttemptInfo taskAttemptInfo : taskInfo.getTaskAttempts()) {
+          setReferenceTime(taskAttemptInfo.getEvents(), dagInfo.getStartTime());
+        }
+      }
+    }
+
+    dagInfo.setVersionInfo(versionInfo);
+  }
+
+  /**
+   * Set reference time to all events
+   *
+   * @param eventList
+   * @param referenceTime
+   */
+  private void setReferenceTime(List<Event> eventList, final long referenceTime) {
+    Iterables.all(eventList, new Predicate<Event>() {
+      @Override public boolean apply(Event input) {
+        input.setReferenceTime(referenceTime);
+        return false;
+      }
+    });
+  }
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Constants.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Constants.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Constants.java
new file mode 100644
index 0000000..3a24f15
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Constants.java
@@ -0,0 +1,59 @@
+/**
+ * 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.tez.history.parser.datamodel;
+
+import org.apache.tez.common.ATSConstants;
+
+import static org.apache.hadoop.classification.InterfaceAudience.Private;
+
+@Private
+public class Constants extends ATSConstants {
+
+  public static final String EVENT_TIME_STAMP = "timestamp";
+  public static final String TEZ_APPLICATION = "TEZ_APPLICATION";
+  public static final String TEZ_TASK_ID = "TEZ_TASK_ID";
+  public static final String TEZ_TASK_ATTEMPT_ID = "TEZ_TASK_ATTEMPT_ID";
+
+  public static final String EDGE_ID = "edgeId";
+  public static final String INPUT_VERTEX_NAME = "inputVertexName";
+  public static final String OUTPUT_VERTEX_NAME = "outputVertexName";
+  public static final String DATA_MOVEMENT_TYPE = "dataMovementType";
+  public static final String EDGE_SOURCE_CLASS = "edgeSourceClass";
+  public static final String EDGE_DESTINATION_CLASS = "edgeDestinationClass";
+  public static final String INPUT_PAYLOAD_TEXT = "inputUserPayloadAsText";
+  public static final String OUTPUT_PAYLOAD_TEXT = "outputUserPayloadAsText";
+
+  public static final String EDGES = "edges";
+  public static final String OUT_EDGE_IDS = "outEdgeIds";
+  public static final String IN_EDGE_IDS = "inEdgeIds";
+  public static final String ADDITIONAL_INPUTS = "additionalInputs";
+  public static final String ADDITIONAL_OUTPUTS = "additionalOutputs";
+
+  public static final String NAME = "name";
+  public static final String CLASS = "class";
+  public static final String INITIALIZER = "initializer";
+  public static final String USER_PAYLOAD_TEXT = "userPayloadAsText";
+
+  //constants for ATS data export
+  public static final String DAG = "dag";
+  public static final String VERTICES = "vertices";
+  public static final String TASKS = "tasks";
+  public static final String TASK_ATTEMPTS = "task_attempts";
+  public static final String APPLICATION = "application";
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Container.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Container.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Container.java
new file mode 100644
index 0000000..4e01d1b
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Container.java
@@ -0,0 +1,70 @@
+/**
+ * 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.tez.history.parser.datamodel;
+
+import com.google.common.base.Objects;
+
+import static org.apache.hadoop.classification.InterfaceAudience.Public;
+import static org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+@Public
+@Evolving
+public class Container {
+
+  private final String id;
+  private final String host;
+
+  public Container(String id, String host) {
+    this.id = id;
+    this.host = host;
+  }
+
+  public final String getId() {
+    return id;
+  }
+
+  public final String getHost() {
+    return host;
+  }
+
+  @Override public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("[");
+    sb.append("id=").append(id).append(", ");
+    sb.append("host=").append(host);
+    sb.append("]");
+    return sb.toString();
+  }
+
+  @Override public int hashCode() {
+    return Objects.hashCode(id, host);
+  }
+
+  @Override public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (obj == null || getClass() != obj.getClass()) {
+      return false;
+    }
+    final Container other = (Container) obj;
+    return Objects.equal(this.id, other.id)
+        && Objects.equal(this.host, other.host);
+  }
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/DagInfo.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/DagInfo.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/DagInfo.java
new file mode 100644
index 0000000..0f3c3af
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/DagInfo.java
@@ -0,0 +1,555 @@
+/**
+ * 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.tez.history.parser.datamodel;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Predicate;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.LinkedHashMultimap;
+import com.google.common.collect.LinkedListMultimap;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.Multimaps;
+import com.google.common.collect.Ordering;
+import org.apache.commons.collections.BidiMap;
+import org.apache.commons.collections.bidimap.DualHashBidiMap;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.tez.dag.api.event.VertexState;
+import org.codehaus.jettison.json.JSONArray;
+import org.codehaus.jettison.json.JSONException;
+import org.codehaus.jettison.json.JSONObject;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
+
+import static org.apache.hadoop.classification.InterfaceAudience.Public;
+import static org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+@Public
+@Evolving
+public class DagInfo extends BaseInfo {
+
+  private static final Log LOG = LogFactory.getLog(DagInfo.class);
+
+  //Fields populated via JSON
+  private final String name;
+  private final long startTime;
+  private final long endTime;
+  private final long submitTime;
+  private final int failedTasks;
+  private final String dagId;
+  private final int numVertices;
+  private final String status;
+  private final String diagnostics;
+  private VersionInfo versionInfo;
+
+  //VertexID --> VertexName & vice versa
+  private final BidiMap vertexNameIDMapping;
+
+  //edgeId to EdgeInfo mapping
+  private final Map<Integer, EdgeInfo> edgeInfoMap;
+
+  //Only for internal parsing (vertexname mapping)
+  private Map<String, BasicVertexInfo> basicVertexInfoMap;
+
+  //VertexName --> VertexInfo
+  private Map<String, VertexInfo> vertexNameMap;
+
+  private Multimap<Container, TaskAttemptInfo> containerMapping;
+
+  DagInfo(JSONObject jsonObject) throws JSONException {
+    super(jsonObject);
+
+    vertexNameMap = Maps.newHashMap();
+    vertexNameIDMapping = new DualHashBidiMap();
+    edgeInfoMap = Maps.newHashMap();
+    basicVertexInfoMap = Maps.newHashMap();
+    containerMapping = LinkedHashMultimap.create();
+
+    Preconditions.checkArgument(jsonObject.getString(Constants.ENTITY_TYPE).equalsIgnoreCase
+        (Constants.TEZ_DAG_ID));
+
+    dagId = jsonObject.getString(Constants.ENTITY);
+
+    //Parse additional Info
+    JSONObject otherInfoNode = jsonObject.getJSONObject(Constants.OTHER_INFO);
+    startTime = otherInfoNode.optLong(Constants.START_TIME);
+    endTime = otherInfoNode.optLong(Constants.FINISH_TIME);
+    //TODO: Not getting populated correctly for lots of jobs.  Verify
+    submitTime = otherInfoNode.optLong(Constants.START_REQUESTED_TIME);
+    diagnostics = otherInfoNode.optString(Constants.DIAGNOSTICS);
+    failedTasks = otherInfoNode.optInt(Constants.NUM_FAILED_TASKS);
+    JSONObject dagPlan = otherInfoNode.optJSONObject(Constants.DAG_PLAN);
+    name = (dagPlan != null) ? (dagPlan.optString(Constants.DAG_NAME)) : null;
+    if (dagPlan != null) {
+      JSONArray vertices = dagPlan.optJSONArray(Constants.VERTICES);
+      if (vertices != null) {
+        numVertices = vertices.length();
+      } else {
+        numVertices = 0;
+      }
+      parseDAGPlan(dagPlan);
+    } else {
+      numVertices = 0;
+    }
+    status = otherInfoNode.optString(Constants.STATUS);
+
+    //parse name id mapping
+    JSONObject vertexIDMappingJson = otherInfoNode.optJSONObject(Constants.VERTEX_NAME_ID_MAPPING);
+    if (vertexIDMappingJson != null) {
+      //get vertex name
+      for (Map.Entry<String, BasicVertexInfo> entry : basicVertexInfoMap.entrySet()) {
+        String vertexId = vertexIDMappingJson.optString(entry.getKey());
+        //vertexName --> vertexId
+        vertexNameIDMapping.put(entry.getKey(), vertexId);
+      }
+    }
+  }
+
+  public static DagInfo create(JSONObject jsonObject) throws JSONException {
+    DagInfo dagInfo = new DagInfo(jsonObject);
+    return dagInfo;
+  }
+
+  private void parseDAGPlan(JSONObject dagPlan) throws JSONException {
+    parseEdges(dagPlan.optJSONArray(Constants.EDGES));
+
+    JSONArray verticesInfo = dagPlan.optJSONArray(Constants.VERTICES);
+    parseBasicVertexInfo(verticesInfo);
+  }
+
+  private void parseBasicVertexInfo(JSONArray verticesInfo) throws JSONException {
+    if (verticesInfo == null) {
+      LOG.info("No vertices available.");
+      return;
+    }
+
+    //Parse basic information available in DAG for vertex and edges
+    for (int i = 0; i < verticesInfo.length(); i++) {
+      BasicVertexInfo basicVertexInfo = new BasicVertexInfo();
+
+      JSONObject vJson = verticesInfo.getJSONObject(i);
+      basicVertexInfo.vertexName =
+          vJson.optString(Constants.VERTEX_NAME);
+      JSONArray inEdges = vJson.optJSONArray(Constants.IN_EDGE_IDS);
+      if (inEdges != null) {
+        String[] inEdgeIds = new String[inEdges.length()];
+        for (int j = 0; j < inEdges.length(); j++) {
+          inEdgeIds[j] = inEdges.get(j).toString();
+        }
+        basicVertexInfo.inEdgeIds = inEdgeIds;
+      }
+
+      JSONArray outEdges = vJson.optJSONArray(Constants.OUT_EDGE_IDS);
+      if (outEdges != null) {
+        String[] outEdgeIds = new String[outEdges.length()];
+        for (int j = 0; j < outEdges.length(); j++) {
+          outEdgeIds[j] = outEdges.get(j).toString();
+        }
+        basicVertexInfo.outEdgeIds = outEdgeIds;
+      }
+
+      JSONArray addInputsJson =
+          vJson.optJSONArray(Constants.ADDITIONAL_INPUTS);
+      basicVertexInfo.additionalInputs = parseAdditionalDetailsForVertex(addInputsJson);
+
+      JSONArray addOutputsJson =
+          vJson.optJSONArray(Constants.ADDITIONAL_OUTPUTS);
+      basicVertexInfo.additionalOutputs = parseAdditionalDetailsForVertex(addOutputsJson);
+
+      basicVertexInfoMap.put(basicVertexInfo.vertexName, basicVertexInfo);
+    }
+  }
+
+  /**
+   * get additional details available for every vertex in the dag
+   *
+   * @param jsonArray
+   * @return AdditionalInputOutputDetails[]
+   * @throws JSONException
+   */
+  private AdditionalInputOutputDetails[] parseAdditionalDetailsForVertex(JSONArray jsonArray) throws
+      JSONException {
+    if (jsonArray != null) {
+      AdditionalInputOutputDetails[]
+          additionalInputOutputDetails = new AdditionalInputOutputDetails[jsonArray.length()];
+      for (int j = 0; j < jsonArray.length(); j++) {
+        String name = jsonArray.getJSONObject(j).optString(
+            Constants.NAME);
+        String clazz = jsonArray.getJSONObject(j).optString(
+            Constants.CLASS);
+        String initializer =
+            jsonArray.getJSONObject(j).optString(Constants.INITIALIZER);
+        String userPayloadText = jsonArray.getJSONObject(j).optString(
+            Constants.USER_PAYLOAD_TEXT);
+
+        additionalInputOutputDetails[j] =
+            new AdditionalInputOutputDetails(name, clazz, initializer, userPayloadText);
+
+      }
+      return additionalInputOutputDetails;
+    }
+    return null;
+  }
+
+  /**
+   * Parse edge details in the DAG
+   *
+   * @param edgesArray
+   *
+   * @throws JSONException
+   */
+  private void parseEdges(JSONArray edgesArray) throws JSONException {
+    if (edgesArray == null) {
+      return;
+    }
+    for (int i = 0; i < edgesArray.length(); i++) {
+      JSONObject edge = edgesArray.getJSONObject(i);
+      Integer edgeId = edge.optInt(Constants.EDGE_ID);
+      String inputVertexName =
+          edge.optString(Constants.INPUT_VERTEX_NAME);
+      String outputVertexName =
+          edge.optString(Constants.OUTPUT_VERTEX_NAME);
+      String dataMovementType =
+          edge.optString(Constants.DATA_MOVEMENT_TYPE);
+      String edgeSourceClass =
+          edge.optString(Constants.EDGE_SOURCE_CLASS);
+      String edgeDestinationClass =
+          edge.optString(Constants.EDGE_DESTINATION_CLASS);
+      String inputUserPayloadAsText =
+          edge.optString(Constants.INPUT_PAYLOAD_TEXT);
+      String outputUserPayloadAsText =
+          edge.optString(Constants.OUTPUT_PAYLOAD_TEXT);
+      EdgeInfo edgeInfo = new EdgeInfo(inputVertexName, outputVertexName,
+          dataMovementType, edgeSourceClass, edgeDestinationClass, inputUserPayloadAsText,
+          outputUserPayloadAsText);
+      edgeInfoMap.put(edgeId, edgeInfo);
+    }
+  }
+
+  static class BasicVertexInfo {
+    String vertexName;
+    String[] inEdgeIds;
+    String[] outEdgeIds;
+    AdditionalInputOutputDetails[] additionalInputs;
+    AdditionalInputOutputDetails[] additionalOutputs;
+  }
+
+  void addVertexInfo(VertexInfo vertexInfo) {
+    BasicVertexInfo basicVertexInfo = basicVertexInfoMap.get(vertexInfo.getVertexName());
+
+    Preconditions.checkArgument(basicVertexInfo != null,
+        "VerteName " + vertexInfo.getVertexName()
+            + " not present in DAG's vertices " + basicVertexInfoMap.entrySet());
+
+    //populate additional information in VertexInfo
+    if (basicVertexInfo.additionalInputs != null) {
+      vertexInfo.setAdditionalInputInfoList(Arrays.asList(basicVertexInfo.additionalInputs));
+    }
+    if (basicVertexInfo.additionalOutputs != null) {
+      vertexInfo.setAdditionalOutputInfoList(Arrays.asList(basicVertexInfo.additionalOutputs));
+    }
+
+    //Populate edge information in vertex
+    if (basicVertexInfo.inEdgeIds != null) {
+      for (String edge : basicVertexInfo.inEdgeIds) {
+        EdgeInfo edgeInfo = edgeInfoMap.get(Integer.parseInt(edge));
+        Preconditions.checkState(edgeInfo != null, "EdgeId " + edge + " not present in DAG");
+        vertexInfo.addInEdge(edgeInfo);
+      }
+    }
+
+    if (basicVertexInfo.outEdgeIds != null) {
+      for (String edge : basicVertexInfo.outEdgeIds) {
+        EdgeInfo edgeInfo = edgeInfoMap.get(Integer.parseInt(edge));
+        Preconditions.checkState(edgeInfo != null, "EdgeId " + edge + " not present in DAG");
+        vertexInfo.addOutEdge(edgeInfo);
+      }
+    }
+
+    vertexNameMap.put(vertexInfo.getVertexName(), vertexInfo);
+  }
+
+  void setVersionInfo(VersionInfo versionInfo) {
+    this.versionInfo = versionInfo;
+  }
+
+  void addContainerMapping(Container container, TaskAttemptInfo taskAttemptInfo) {
+    this.containerMapping.put(container, taskAttemptInfo);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("[");
+    sb.append("dagID=").append(getDagId()).append(", ");
+    sb.append("dagName=").append(getName()).append(", ");
+    sb.append("status=").append(getStatus()).append(", ");
+    sb.append("startTime=").append(getStartTime()).append(", ");
+    sb.append("submitTime=").append(getAbsoluteSubmitTime()).append(", ");
+    sb.append("endTime=").append(getFinishTime()).append(", ");
+    sb.append("timeTaken=").append(getTimeTaken()).append(", ");
+    sb.append("diagnostics=").append(getDiagnostics()).append(", ");
+    sb.append("vertexNameIDMapping=").append(getVertexNameIDMapping()).append(", ");
+    sb.append("failedTasks=").append(getFailedTaskCount()).append(", ");
+    sb.append("events=").append(getEvents()).append(", ");
+    sb.append("status=").append(getStatus());
+    sb.append("]");
+    return sb.toString();
+  }
+
+  public Multimap<Container, TaskAttemptInfo> getContainerMapping() {
+    return Multimaps.unmodifiableMultimap(containerMapping);
+  }
+
+  public final VersionInfo getVersionInfo() {
+    return versionInfo;
+  }
+
+  public final String getName() {
+    return name;
+  }
+
+  public final Collection<EdgeInfo> getEdges() {
+    return Collections.unmodifiableCollection(edgeInfoMap.values());
+  }
+
+  public final long getAbsoluteSubmitTime() {
+    return submitTime;
+  }
+
+  public final long getAbsStartTime() {
+    return startTime;
+  }
+
+  public final long getAbsFinishTime() {
+    return endTime;
+  }
+
+  /**
+   * Reference start time for the DAG. Vertex, Task, TaskAttempt would map on to this.
+   * If absolute start time is needed, call getAbsStartTime().
+   *
+   * @return starting time w.r.t to dag
+   */
+  public final long getStartTime() {
+    return 0;
+  }
+
+  @Override
+  public final long getFinishTime() {
+    long dagEndTime = (endTime - startTime);
+    if (dagEndTime < 0) {
+      //probably dag is not complete or failed in middle. get the last task attempt time
+      for (VertexInfo vertexInfo : getVertices()) {
+        dagEndTime = (vertexInfo.getFinishTime() > dagEndTime) ? vertexInfo.getFinishTime() : dagEndTime;
+      }
+    }
+    return dagEndTime;
+  }
+
+  public final long getTimeTaken() {
+    return getFinishTime();
+  }
+
+  public final String getStatus() {
+    return status;
+  }
+
+  /**
+   * Get vertexInfo for a given vertexid
+   *
+   * @param vertexId
+   * @return VertexInfo
+   */
+  public VertexInfo getVertexFromId(String vertexId) {
+    return vertexNameMap.get(vertexNameIDMapping.getKey(vertexId));
+  }
+
+  /**
+   * Get vertexInfo for a given vertex name
+   *
+   * @param vertexName
+   * @return VertexInfo
+   */
+  public final VertexInfo getVertex(String vertexName) {
+    return vertexNameMap.get(vertexName);
+  }
+
+  public final String getDiagnostics() {
+    return diagnostics;
+  }
+
+  /**
+   * Get all vertices
+   *
+   * @return List<VertexInfo>
+   */
+  public final List<VertexInfo> getVertices() {
+    List<VertexInfo> vertices = Lists.newLinkedList(vertexNameMap.values());
+    Collections.sort(vertices, new Comparator<VertexInfo>() {
+
+      @Override public int compare(VertexInfo o1, VertexInfo o2) {
+        return (o1.getStartTime() < o2.getStartTime()) ? -1 :
+            ((o1.getStartTime() == o2.getStartTime()) ?
+                0 : 1);
+      }
+    });
+    return Collections.unmodifiableList(vertices);
+  }
+
+  /**
+   * Get list of failed vertices
+   *
+   * @return List<VertexInfo>
+   */
+  public final List<VertexInfo> getFailedVertices() {
+    return getVertices(VertexState.FAILED);
+  }
+
+  /**
+   * Get list of killed vertices
+   *
+   * @return List<VertexInfo>
+   */
+  public final List<VertexInfo> getKilledVertices() {
+    return getVertices(VertexState.KILLED);
+  }
+
+  /**
+   * Get list of failed vertices
+   *
+   * @return List<VertexInfo>
+   */
+  public final List<VertexInfo> getSuccessfullVertices() {
+    return getVertices(VertexState.SUCCEEDED);
+  }
+
+  /**
+   * Get list of vertices belonging to a specific state
+   *
+   * @param state
+   * @return Collection<VertexInfo>
+   */
+  public final List<VertexInfo> getVertices(final VertexState state) {
+    return Collections.unmodifiableList(Lists.newLinkedList(Iterables.filter(Lists.newLinkedList
+                    (vertexNameMap.values()), new Predicate<VertexInfo>() {
+                  @Override public boolean apply(VertexInfo input) {
+                    return input.getStatus() != null && input.getStatus().equals(state.toString());
+                  }
+                }
+            )
+        )
+    );
+  }
+
+  public final Map<String, VertexInfo> getVertexMapping() {
+    return Collections.unmodifiableMap(vertexNameMap);
+  }
+
+  private Ordering<VertexInfo> getVertexOrdering() {
+    return Ordering.from(new Comparator<VertexInfo>() {
+      @Override public int compare(VertexInfo o1, VertexInfo o2) {
+        return (o1.getTimeTaken() < o2.getTimeTaken()) ? -1 :
+            ((o1.getTimeTaken() == o2.getTimeTaken()) ?
+                0 : 1);
+      }
+    });
+  }
+
+  /**
+   * Get the slowest vertex in the DAG
+   *
+   * @return VertexInfo
+   */
+  public final VertexInfo getSlowestVertex() {
+    List<VertexInfo> vertexInfoList = getVertices();
+    if (vertexInfoList.size() == 0) {
+      return null;
+    }
+    return getVertexOrdering().max(vertexInfoList);
+  }
+
+  /**
+   * Get the slowest vertex in the DAG
+   *
+   * @return VertexInfo
+   */
+  public final VertexInfo getFastestVertex() {
+    List<VertexInfo> vertexInfoList = getVertices();
+    if (vertexInfoList.size() == 0) {
+      return null;
+    }
+    return getVertexOrdering().min(vertexInfoList);
+  }
+
+  /**
+   * Get node details for this DAG. Would be useful for analyzing node to tasks.
+   *
+   * @return Multimap<String, TaskAttemptInfo> taskAttempt details at every node
+   */
+  public final Multimap<String, TaskAttemptInfo> getNodeDetails() {
+    Multimap<String, TaskAttemptInfo> nodeDetails = LinkedListMultimap.create();
+    for (VertexInfo vertexInfo : getVertices()) {
+      Multimap<Container, TaskAttemptInfo> containerMapping = vertexInfo.getContainersMapping();
+      for (Map.Entry<Container, TaskAttemptInfo> entry : containerMapping.entries()) {
+        nodeDetails.put(entry.getKey().getHost(), entry.getValue());
+      }
+    }
+    return nodeDetails;
+  }
+
+  /**
+   * Get containers used for this DAG
+   *
+   * @return Multimap<Container, TaskAttemptInfo> task attempt details at every container
+   */
+  public final Multimap<Container, TaskAttemptInfo> getContainersToTaskAttemptMapping() {
+    List<VertexInfo> VertexInfoList = getVertices();
+    Multimap<Container, TaskAttemptInfo> containerMapping = LinkedHashMultimap.create();
+
+    for (VertexInfo vertexInfo : VertexInfoList) {
+      containerMapping.putAll(vertexInfo.getContainersMapping());
+    }
+    return Multimaps.unmodifiableMultimap(containerMapping);
+  }
+
+  public final Map getVertexNameIDMapping() {
+    return vertexNameIDMapping;
+  }
+
+  public final int getNumVertices() {
+    return numVertices;
+  }
+
+  public final String getDagId() {
+    return dagId;
+  }
+
+  public final int getFailedTaskCount() {
+    return failedTasks;
+  }
+
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/EdgeInfo.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/EdgeInfo.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/EdgeInfo.java
new file mode 100644
index 0000000..ab8e831
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/EdgeInfo.java
@@ -0,0 +1,112 @@
+/**
+ * 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.tez.history.parser.datamodel;
+
+import static org.apache.hadoop.classification.InterfaceAudience.Public;
+import static org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+@Public
+@Evolving
+public class EdgeInfo {
+
+  private final String inputVertexName;
+  private final String outputVertexName;
+  private final String dataMovementType;
+  private final String edgeSourceClass;
+  private final String edgeDestinationClass;
+  private final String inputUserPayloadAsText;
+  private final String outputUserPayloadAsText;
+
+  private VertexInfo sourceVertex;
+  private VertexInfo destinationVertex;
+
+  public EdgeInfo(String inputVertexName, String outputVertexName, String dataMovementType,
+      String edgeSourceClass, String edgeDestinationClass, String inputUserPayloadAsText, String
+      outputUserPayloadAsText) {
+    this.inputVertexName = inputVertexName;
+    this.outputVertexName = outputVertexName;
+    this.dataMovementType = dataMovementType;
+    this.edgeSourceClass = edgeSourceClass;
+    this.edgeDestinationClass = edgeDestinationClass;
+    this.inputUserPayloadAsText = inputUserPayloadAsText;
+    this.outputUserPayloadAsText = outputUserPayloadAsText;
+  }
+
+  public final String getInputVertexName() {
+    return inputVertexName;
+  }
+
+  public final String getOutputVertexName() {
+    return outputVertexName;
+  }
+
+  public final String getDataMovementType() {
+    return dataMovementType;
+  }
+
+  public final String getEdgeSourceClass() {
+    return edgeSourceClass;
+  }
+
+  public final String getEdgeDestinationClass() {
+    return edgeDestinationClass;
+  }
+
+  public final String getInputUserPayloadAsText() {
+    return inputUserPayloadAsText;
+  }
+
+  public final String getOutputUserPayloadAsText() {
+    return outputUserPayloadAsText;
+  }
+
+  public final VertexInfo getSourceVertex() {
+    return sourceVertex;
+  }
+
+  public final void setSourceVertex(VertexInfo sourceVertex) {
+    this.sourceVertex = sourceVertex;
+  }
+
+  public final VertexInfo getDestinationVertex() {
+    return destinationVertex;
+  }
+
+  public final void setDestinationVertex(VertexInfo destinationVertex) {
+    this.destinationVertex = destinationVertex;
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    sb.append("[");
+    sb.append("inputVertexName=").append(inputVertexName).append(", ");
+    sb.append("outputVertexName=").append(outputVertexName).append(", ");
+    sb.append("dataMovementType=").append(dataMovementType).append(", ");
+    sb.append("edgeSourceClass=").append(edgeSourceClass).append(", ");
+    sb.append("edgeDestinationClass=").append(edgeDestinationClass).append(", ");
+    sb.append("inputUserPayloadAsText=").append(inputUserPayloadAsText).append(",");
+    sb.append("outputUserPayloadAsText=").append(outputUserPayloadAsText).append(", ");
+    sb.append("sourceVertex=").append(sourceVertex.getVertexName()).append(", ");
+    sb.append("destinationVertex=").append(destinationVertex.getVertexName()).append(", ");
+    sb.append("outputUserPayloadAsText=").append(outputUserPayloadAsText);
+    sb.append("]");
+    return sb.toString();
+  }
+}

http://git-wip-us.apache.org/repos/asf/tez/blob/11aa17e0/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Event.java
----------------------------------------------------------------------
diff --git a/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Event.java b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Event.java
new file mode 100644
index 0000000..70310f3
--- /dev/null
+++ b/tez-plugins/tez-history-parser/src/main/java/org/apache/tez/history/parser/datamodel/Event.java
@@ -0,0 +1,63 @@
+/**
+ * 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.tez.history.parser.datamodel;
+
+import static org.apache.hadoop.classification.InterfaceAudience.Public;
+import static org.apache.hadoop.classification.InterfaceStability.Evolving;
+
+@Public
+@Evolving
+public class Event {
+  private final String info;
+  private final String type;
+  private final long time;
+
+  private long refTime; //typically dag start time.
+
+  public Event(String info, String type, long time) {
+    this.time = time;
+    this.type = type;
+    this.info = info;
+  }
+
+  void setReferenceTime(long refTime) {
+    this.refTime = refTime;
+  }
+
+  public final String getInfo() {
+    return info;
+  }
+
+  public final String getType() {
+    return type;
+  }
+
+  public final long getAbsoluteTime() {
+    return time;
+  }
+
+  public final long getTime() {
+    return time - refTime;
+  }
+
+  @Override
+  public String toString() {
+    return "[info=" + info + ", type=" + type + ", time=" + time + "]";
+  }
+}


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