Merge -r 1353756:1353757 from trunk to branch. FIXES: MAPREDUCE-4355

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1353760 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -6,6 +6,8 @@ Release 2.0.1-alpha - UNRELEASED
 
   NEW FEATURES
 
+    MAPREDUCE-4355. Add JobStatus getJobStatus(JobID) to JobClient. (kkambatl via tucu)
+
   IMPROVEMENTS
 
     MAPREDUCE-4146. Support limits on task status string length and number of

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/test/java/org/apache/hadoop/mapred/TestJobClient.java

@@ -19,6 +19,7 @@
 package org.apache.hadoop.mapred;
 
 import static junit.framework.Assert.assertNotNull;
+import static org.junit.Assert.assertEquals;
 
 import java.io.IOException;
 
@@ -28,7 +29,7 @@ import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.junit.Test;
 
-public class TestJobClientGetJob {
+public class TestJobClient {
   
   private static Path TEST_ROOT_DIR =
     new Path(System.getProperty("test.build.data","/tmp"));
@@ -45,7 +46,7 @@ public class TestJobClientGetJob {
   
   @SuppressWarnings("deprecation")
   @Test
-  public void testGetRunningJobFromJobClient() throws Exception {
+  public void testGetRunningJob() throws Exception {
     JobConf conf = new JobConf();
     conf.set("mapreduce.framework.name", "local");
     FileInputFormat.addInputPath(conf, createTempFile("in", "hello"));
@@ -60,4 +61,21 @@ public class TestJobClientGetJob {
     assertNotNull("New running job", newRunningJob);
   }
 
+  @SuppressWarnings("deprecation")
+  @Test
+  public void testGetJobStatus() throws Exception {
+    JobConf conf = new JobConf();
+    conf.set("mapreduce.framework.name", "local");
+    FileInputFormat.addInputPath(conf, createTempFile("in", "hello"));
+    Path outputDir = new Path(TEST_ROOT_DIR, getClass().getSimpleName());
+    outputDir.getFileSystem(conf).delete(outputDir, true);
+    FileOutputFormat.setOutputPath(conf, outputDir);
+    JobClient jc = new JobClient(conf);
+    RunningJob runningJob = jc.submitJob(conf);
+    assertNotNull("Running job", runningJob);
+    JobID jobid = runningJob.getID();
+    JobStatus jobStatus = jc.getJobStatus(jobid);
+    assertNotNull("New running job", jobStatus);
+    assertEquals("Equal JobIDs", jobid, jobStatus.getJobID());
+  }
 }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/JobClient.java

@@ -620,6 +620,15 @@ public class JobClient extends CLI {
     }
   }
 
+  private JobStatus getJobStatusUsingCluster(final JobID jobId)
+      throws IOException, InterruptedException {
+    return clientUgi.doAs(new PrivilegedExceptionAction<JobStatus>() {
+      public JobStatus run() throws IOException, InterruptedException {
+        return JobStatus.downgrade(cluster.getJobStatus(jobId));
+      }
+    });
+  }
+
   private Job getJobUsingCluster(final JobID jobid) throws IOException,
   InterruptedException {
     return clientUgi.doAs(new PrivilegedExceptionAction<Job>() {
@@ -628,27 +637,39 @@ public class JobClient extends CLI {
       }
     });
   }
+
   /**
-   * Get an {@link RunningJob} object to track an ongoing job.  Returns
+   * Get {@link JobStatus} of a job. Returns null if the id does not correspond
-   * null if the id does not correspond to any known job.
+   * to any known job.
    * 
-   * @param jobid the jobid of the job.
+   * @param jobid
+   *          the jobid of the job.
+   * @return the {@link JobStatus} object to retrieve the job stats, null if the
+   *         <code>jobid</code> doesn't correspond to any known job.
+   * @throws IOException
+   */
+  public JobStatus getJobStatus(JobID jobId) throws IOException {
+    try {
+      return getJobStatusUsingCluster(jobId);
+    } catch (InterruptedException ie) {
+      throw new IOException(ie);
+    }
+  }
+
+  /**
+   * Get an {@link RunningJob} object to track an ongoing job. Returns null if
+   * the id does not correspond to any known job.
+   * 
+   * @param jobid
+   *          the jobid of the job.
    * @return the {@link RunningJob} handle to track the job, null if the
    *         <code>jobid</code> doesn't correspond to any known job.
    * @throws IOException
    */
-  public RunningJob getJob(final JobID jobid) throws IOException {
+  public RunningJob getJob(JobID jobId) throws IOException {
-    try {
+    JobStatus status = getJobStatus(jobId);
-      
+    if (status != null) {
-      Job job = getJobUsingCluster(jobid);
+      return new NetworkedJob(status, cluster);
-      if (job != null) {
-        JobStatus status = JobStatus.downgrade(job.getStatus());
-        if (status != null) {
-          return new NetworkedJob(status, cluster);
-        } 
-      }
-    } catch (InterruptedException ie) {
-      throw new IOException(ie);
     }
     return null;
   }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/Cluster.java

@@ -172,6 +172,19 @@ public class Cluster {
     return fs;
   }
 
+  /**
+   * Get JobStatus corresponding to jobId.
+   * 
+   * @param jobId
+   * @return object of {@link JobStatus}
+   * @throws IOException
+   * @throws InterruptedException
+   */
+  public JobStatus getJobStatus(JobID jobId) throws IOException,
+      InterruptedException {
+    return client.getJobStatus(jobId);
+  }
+
   /**
    * Get job corresponding to jobid.
    * 
@@ -181,7 +194,7 @@ public class Cluster {
    * @throws InterruptedException
    */
   public Job getJob(JobID jobId) throws IOException, InterruptedException {
-    JobStatus status = client.getJobStatus(jobId);
+    JobStatus status = getJobStatus(jobId);
     if (status != null) {
       return Job.getInstance(this, status, new JobConf(status.getJobFile()));
     }