MAPREDUCE-5870. Support for passing Job priority through Application Submission Context in Mapreduce Side. Contributed by Sunil G

(cherry picked from commit f634505d48)

Conflicts:

	hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestJobConf.java

hadoop-mapreduce-project/CHANGES.txt

@@ -139,6 +139,9 @@ Release 2.8.0 - UNRELEASED
     MAPREDUCE-6499. Add elapsed time for retired job in JobHistoryServer WebUI.
     (Lin Yiqun via aajisaka)
 
+    MAPREDUCE-5870. Support for passing Job priority through Application
+    Submission Context in Mapreduce Side (Sunil G via jlowe)
+
   OPTIMIZATIONS
 
     MAPREDUCE-6376. Add avro binary support for jhist files (Ray Chiang via

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/local/LocalContainerAllocator.java

@@ -43,6 +43,7 @@ import org.apache.hadoop.yarn.api.protocolrecords.AllocateResponse;
 import org.apache.hadoop.yarn.api.records.Container;
 import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.api.records.NodeId;
+import org.apache.hadoop.yarn.api.records.Priority;
 import org.apache.hadoop.yarn.api.records.ResourceRequest;
 import org.apache.hadoop.yarn.api.records.Token;
 import org.apache.hadoop.yarn.client.ClientRMProxy;
@@ -146,6 +147,11 @@ public class LocalContainerAllocator extends RMCommunicator
       if (token != null) {
         updateAMRMToken(token);
       }
+      Priority priorityFromResponse = Priority.newInstance(allocateResponse
+          .getApplicationPriority().getPriority());
+
+      // Update the job priority to Job directly.
+      getJob().setJobPriority(priorityFromResponse);
     }
   }
 

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TestJobImpl.java

@@ -914,7 +914,7 @@ public class TestJobImpl {
     assertJobState(job, JobStateInternal.RUNNING);
 
     // Update priority of job to 8, and see whether its updated
-    Priority updatedPriority = Priority.newInstance(5);
+    Priority updatedPriority = Priority.newInstance(8);
     job.setJobPriority(updatedPriority);
     assertJobState(job, JobStateInternal.RUNNING);
     Priority jobPriority = job.getReport().getJobPriority();

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/local/TestLocalContainerAllocator.java

@@ -49,6 +49,7 @@ import org.apache.hadoop.yarn.api.records.Container;
 import org.apache.hadoop.yarn.api.records.ContainerStatus;
 import org.apache.hadoop.yarn.api.records.NMToken;
 import org.apache.hadoop.yarn.api.records.NodeReport;
+import org.apache.hadoop.yarn.api.records.Priority;
 import org.apache.hadoop.yarn.api.records.Resource;
 import org.apache.hadoop.yarn.client.ClientRMProxy;
 import org.apache.hadoop.yarn.event.EventHandler;
@@ -245,7 +246,7 @@ public class TestLocalContainerAllocator {
             amToken.getIdentifier(), amToken.getKind().toString(),
             amToken.getPassword(), amToken.getService().toString());
       }
-      return AllocateResponse.newInstance(responseId,
+      AllocateResponse response = AllocateResponse.newInstance(responseId,
           Collections.<ContainerStatus>emptyList(),
           Collections.<Container>emptyList(),
           Collections.<NodeReport>emptyList(),
@@ -254,6 +255,8 @@ public class TestLocalContainerAllocator {
           yarnToken,
           Collections.<Container>emptyList(),
           Collections.<Container>emptyList());
+      response.setApplicationPriority(Priority.newInstance(0));
+      return response;
     }
   }
 }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/TypeConverter.java

@@ -84,6 +84,25 @@ public class TypeConverter {
     return jobId;
   }
 
+  public static int toYarnApplicationPriority(String priority) {
+    JobPriority jobPriority = JobPriority.valueOf(priority);
+    switch (jobPriority) {
+    case VERY_HIGH :
+      return 5;
+    case HIGH :
+      return 4;
+    case NORMAL :
+      return 3;
+    case LOW :
+      return 2;
+    case VERY_LOW :
+      return 1;
+    case DEFAULT :
+      return 0;
+    }
+    throw new IllegalArgumentException("Unrecognized priority: " + priority);
+  }
+
   private static String fromClusterTimeStamp(long clusterTimeStamp) {
     return Long.toString(clusterTimeStamp);
   }
@@ -165,6 +184,8 @@ public class TypeConverter {
       return Phase.REDUCE;
     case CLEANUP:
       return Phase.CLEANUP;
+    default:
+      break;
     }
     throw new YarnRuntimeException("Unrecognized Phase: " + phase);
   }
@@ -327,10 +348,33 @@ public class TypeConverter {
       return JobPriority.VERY_LOW;
     case 0 :
       return JobPriority.DEFAULT;
+    default :
+      break;
     }
     return JobPriority.UNDEFINED_PRIORITY;
   }
 
+  public static org.apache.hadoop.mapreduce.JobPriority
+      fromYarnApplicationPriority(int priority) {
+    switch (priority) {
+    case 5 :
+      return org.apache.hadoop.mapreduce.JobPriority.VERY_HIGH;
+    case 4 :
+      return org.apache.hadoop.mapreduce.JobPriority.HIGH;
+    case 3 :
+      return org.apache.hadoop.mapreduce.JobPriority.NORMAL;
+    case 2 :
+      return org.apache.hadoop.mapreduce.JobPriority.LOW;
+    case 1 :
+      return org.apache.hadoop.mapreduce.JobPriority.VERY_LOW;
+    case 0 :
+      return org.apache.hadoop.mapreduce.JobPriority.DEFAULT;
+    default :
+      break;
+    }
+    return org.apache.hadoop.mapreduce.JobPriority.UNDEFINED_PRIORITY;
+  }
+
   public static org.apache.hadoop.mapreduce.QueueState fromYarn(
       QueueState state) {
     org.apache.hadoop.mapreduce.QueueState qState =
@@ -462,7 +506,9 @@ public class TypeConverter {
           TypeConverter.fromYarn(application.getApplicationId()),
           0.0f, 0.0f, 0.0f, 0.0f,
           TypeConverter.fromYarn(application.getYarnApplicationState(), application.getFinalApplicationStatus()),
-          org.apache.hadoop.mapreduce.JobPriority.NORMAL,
+          fromYarnApplicationPriority(
+            (application.getPriority() == null) ? 0 :
+            application.getPriority().getPriority()),
           application.getUser(), application.getName(),
           application.getQueue(), jobFile, trackingUrl, false
       );

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

@@ -85,6 +85,7 @@ public class TestTypeConverter {
     applicationReport.setStartTime(appStartTime);
     applicationReport.setFinishTime(appFinishTime);
     applicationReport.setUser("TestTypeConverter-user");
+    applicationReport.setPriority(Priority.newInstance(3));
     ApplicationResourceUsageReport appUsageRpt = Records
         .newRecord(ApplicationResourceUsageReport.class);
     Resource r = Records.newRecord(Resource.class);
@@ -99,6 +100,7 @@ public class TestTypeConverter {
     Assert.assertEquals(appStartTime, jobStatus.getStartTime());
     Assert.assertEquals(appFinishTime, jobStatus.getFinishTime());    
     Assert.assertEquals(state.toString(), jobStatus.getState().toString());
+    Assert.assertEquals(JobPriority.NORMAL, jobStatus.getPriority());
   }
 
   @Test
@@ -113,6 +115,7 @@ public class TestTypeConverter {
     when(mockReport.getYarnApplicationState()).thenReturn(YarnApplicationState.KILLED);
     when(mockReport.getUser()).thenReturn("dummy-user");
     when(mockReport.getQueue()).thenReturn("dummy-queue");
+    when(mockReport.getPriority()).thenReturn(Priority.newInstance(4));
     String jobFile = "dummy-path/job.xml";
 
     try {
@@ -146,6 +149,7 @@ public class TestTypeConverter {
     Assert.assertEquals("num used slots info set incorrectly", 3, status.getNumUsedSlots());
     Assert.assertEquals("rsvd mem info set incorrectly", 2048, status.getReservedMem());
     Assert.assertEquals("used mem info set incorrectly", 2048, status.getUsedMem());
+    Assert.assertEquals("priority set incorrectly", JobPriority.HIGH, status.getPriority());
   }
 
   @Test

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

@@ -1561,6 +1561,15 @@ public class JobConf extends Configuration {
     set(JobContext.PRIORITY, prio.toString());
   }
 
+  /**
+   * Set {@link JobPriority} for this job.
+   *
+   * @param prio the {@link JobPriority} for this job.
+   */
+  public void setJobPriorityAsInteger(int prio) {
+    set(JobContext.PRIORITY, Integer.toString(prio));
+  }
+
   /**
    * Get the {@link JobPriority} for this job.
    *
@@ -1569,10 +1578,81 @@ public class JobConf extends Configuration {
   public JobPriority getJobPriority() {
     String prio = get(JobContext.PRIORITY);
     if (prio == null) {
-      return JobPriority.NORMAL;
+      return JobPriority.DEFAULT;
     }
 
-    return JobPriority.valueOf(prio);
+    JobPriority priority = JobPriority.DEFAULT;
+    try {
+      priority = JobPriority.valueOf(prio);
+    } catch (IllegalArgumentException e) {
+      return convertToJobPriority(Integer.parseInt(prio));
+    }
+    return priority;
+  }
+
+  /**
+   * Get the priority for this job.
+   *
+   * @return the priority for this job.
+   */
+  public int getJobPriorityAsInteger() {
+    String priority = get(JobContext.PRIORITY);
+    if (priority == null) {
+      return 0;
+    }
+
+    int jobPriority = 0;
+    try {
+      jobPriority = convertPriorityToInteger(priority);
+    } catch (IllegalArgumentException e) {
+      return Integer.parseInt(priority);
+    }
+    return jobPriority;
+  }
+
+  private int convertPriorityToInteger(String priority) {
+    JobPriority jobPriority = JobPriority.valueOf(priority);
+    switch (jobPriority) {
+    case VERY_HIGH :
+      return 5;
+    case HIGH :
+      return 4;
+    case NORMAL :
+      return 3;
+    case LOW :
+      return 2;
+    case VERY_LOW :
+      return 1;
+    case DEFAULT :
+      return 0;
+    default:
+      break;
+    }
+
+    // If a user sets the priority as "UNDEFINED_PRIORITY", we can return
+    // 0 which is also default value.
+    return 0;
+  }
+
+  private JobPriority convertToJobPriority(int priority) {
+    switch (priority) {
+    case 5 :
+      return JobPriority.VERY_HIGH;
+    case 4 :
+      return JobPriority.HIGH;
+    case 3 :
+      return JobPriority.NORMAL;
+    case 2 :
+      return JobPriority.LOW;
+    case 1 :
+      return JobPriority.VERY_LOW;
+    case 0 :
+      return JobPriority.DEFAULT;
+    default:
+      break;
+    }
+
+    return JobPriority.UNDEFINED_PRIORITY;
   }
 
   /**

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

@@ -22,6 +22,12 @@ import org.apache.hadoop.classification.InterfaceStability;
 
 /**
  * Used to describe the priority of the running job. 
+ * DEFAULT : While submitting a job, if the user is not specifying priority,
+ * YARN has the capability to pick the default priority as per its config.
+ * Hence MapReduce can indicate such cases with this new enum.
+ * UNDEFINED_PRIORITY : YARN supports priority as an integer. Hence other than
+ * the five defined enums, YARN can consider other integers also. To generalize
+ * such cases, this specific enum is used.
  */
 @InterfaceAudience.Public
 @InterfaceStability.Stable

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

@@ -148,7 +148,7 @@ public class JobStatus extends org.apache.hadoop.mapreduce.JobStatus {
                    String user, String jobName, 
                    String jobFile, String trackingUrl) {
     this(jobid, mapProgress, reduceProgress, cleanupProgress, runState,
-        JobPriority.NORMAL, user, jobName, jobFile, trackingUrl);
+        JobPriority.DEFAULT, user, jobName, jobFile, trackingUrl);
   }
 
   /**

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

@@ -407,7 +407,7 @@ public class Job extends JobContextImpl implements JobContext {
   /**
    * Get scheduling info of the job.
    * 
-   * @return the scheduling info of the job
+   * @return the priority info of the job
    */
   public JobPriority getPriority() throws IOException, InterruptedException {
     ensureState(JobState.RUNNING);
@@ -635,27 +635,78 @@ public class Job extends JobContextImpl implements JobContext {
 
   /**
    * Set the priority of a running job.
-   * @param priority the new priority for the job.
+   * @param jobPriority the new priority for the job.
    * @throws IOException
    */
-  public void setPriority(JobPriority priority) 
+  public void setPriority(JobPriority jobPriority) throws IOException,
-      throws IOException, InterruptedException {
+      InterruptedException {
     if (state == JobState.DEFINE) {
-      conf.setJobPriority(
+      if (jobPriority == JobPriority.UNDEFINED_PRIORITY) {
-        org.apache.hadoop.mapred.JobPriority.valueOf(priority.name()));
+        conf.setJobPriorityAsInteger(convertPriorityToInteger(jobPriority));
+      } else {
+        conf.setJobPriority(org.apache.hadoop.mapred.JobPriority
+            .valueOf(jobPriority.name()));
+      }
     } else {
       ensureState(JobState.RUNNING);
-      final JobPriority tmpPriority = priority;
+      final int tmpPriority = convertPriorityToInteger(jobPriority);
       ugi.doAs(new PrivilegedExceptionAction<Object>() {
         @Override
         public Object run() throws IOException, InterruptedException {
-          cluster.getClient().setJobPriority(getJobID(), tmpPriority.toString());
+          cluster.getClient()
+              .setJobPriority(getJobID(), Integer.toString(tmpPriority));
           return null;
         }
       });
     }
   }
 
+  /**
+   * Set the priority of a running job.
+   *
+   * @param jobPriority
+   *          the new priority for the job.
+   * @throws IOException
+   */
+  public void setPriorityAsInteger(int jobPriority) throws IOException,
+      InterruptedException {
+    if (state == JobState.DEFINE) {
+      conf.setJobPriorityAsInteger(jobPriority);
+    } else {
+      ensureState(JobState.RUNNING);
+      final int tmpPriority = jobPriority;
+      ugi.doAs(new PrivilegedExceptionAction<Object>() {
+        @Override
+        public Object run() throws IOException, InterruptedException {
+          cluster.getClient()
+              .setJobPriority(getJobID(), Integer.toString(tmpPriority));
+          return null;
+        }
+      });
+    }
+  }
+
+  private int convertPriorityToInteger(JobPriority jobPriority) {
+    switch (jobPriority) {
+    case VERY_HIGH :
+      return 5;
+    case HIGH :
+      return 4;
+    case NORMAL :
+      return 3;
+    case LOW :
+      return 2;
+    case VERY_LOW :
+      return 1;
+    case DEFAULT :
+      return 0;
+    default:
+      break;
+    }
+    // For UNDEFINED_PRIORITY, we can set it to default for better handling
+    return 0;
+  }
+
   /**
    * Get events indicating completion (success/failure) of component tasks.
    *  

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

@@ -22,7 +22,12 @@ import org.apache.hadoop.classification.InterfaceStability;
 
 /**
  * Used to describe the priority of the running job. 
- *
+ * DEFAULT : While submitting a job, if the user is not specifying priority,
+ * YARN has the capability to pick the default priority as per its config.
+ * Hence MapReduce can indicate such cases with this new enum.
+ * UNDEFINED_PRIORITY : YARN supports priority as an integer. Hence other than
+ * the five defined enums, YARN can consider other integers also. To generalize
+ * such cases, this specific enum is used.
  */
 @InterfaceAudience.Public
 @InterfaceStability.Evolving

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

@@ -97,6 +97,7 @@ public class CLI extends Configured implements Tool {
     String taskState = null;
     int fromEvent = 0;
     int nEvents = 0;
+    int jpvalue = 0;
     boolean getStatus = false;
     boolean getCounter = false;
     boolean killJob = false;
@@ -151,10 +152,14 @@ public class CLI extends Configured implements Tool {
       try {
         jp = JobPriority.valueOf(argv[2]);
       } catch (IllegalArgumentException iae) {
-        LOG.info(iae);
+        try {
+          jpvalue = Integer.parseInt(argv[2]);
+        } catch (NumberFormatException ne) {
+          LOG.info(ne);
           displayUsage(cmd);
           return exitCode;
         }
+      }
       setJobPriority = true; 
     } else if ("-events".equals(cmd)) {
       if (argv.length != 4) {
@@ -322,7 +327,11 @@ public class CLI extends Configured implements Tool {
         if (job == null) {
           System.out.println("Could not find job " + jobid);
         } else {
+          if (jp != null) {
             job.setPriority(jp);
+          } else {
+            job.setPriorityAsInteger(jpvalue);
+          }
           System.out.println("Changed job priority.");
           exitCode = 0;
         } 
@@ -408,6 +417,10 @@ public class CLI extends Configured implements Tool {
   private String getJobPriorityNames() {
     StringBuffer sb = new StringBuffer();
     for (JobPriority p : JobPriority.values()) {
+      // UNDEFINED_PRIORITY need not to be displayed in usage
+      if (JobPriority.UNDEFINED_PRIORITY == p) {
+        continue;
+      }
       sb.append(p.name()).append(" ");
     }
     return sb.substring(0, sb.length()-1);
@@ -444,7 +457,8 @@ public class CLI extends Configured implements Tool {
     } else if ("-set-priority".equals(cmd)) {
       System.err.println(prefix + "[" + cmd + " <job-id> <priority>]. " +
           "Valid values for priorities are: " 
-          + jobPriorityValues); 
+          + jobPriorityValues
+          + ". In addition to this, integers also can be used.");
     } else if ("-list-active-trackers".equals(cmd)) {
       System.err.println(prefix + "[" + cmd + "]");
     } else if ("-list-blacklisted-trackers".equals(cmd)) {
@@ -465,7 +479,8 @@ public class CLI extends Configured implements Tool {
       System.err.printf("\t[-counter <job-id> <group-name> <counter-name>]%n");
       System.err.printf("\t[-kill <job-id>]%n");
       System.err.printf("\t[-set-priority <job-id> <priority>]. " +
-        "Valid values for priorities are: " + jobPriorityValues + "%n");
+          "Valid values for priorities are: " + jobPriorityValues +
+          ". In addition to this, integers also can be used." + "%n");
       System.err.printf("\t[-events <job-id> <from-event-#> <#-of-events>]%n");
       System.err.printf("\t[-history <jobHistoryFile>]%n");
       System.err.printf("\t[-list [all]]%n");

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestJobConf.java

@@ -99,7 +99,7 @@ public class TestJobConf {
     assertEquals(70, conf.getMaxReduceTaskFailuresPercent());
 
     // by default
-    assertEquals(JobPriority.NORMAL.name(), conf.getJobPriority().name());
+    assertEquals(JobPriority.DEFAULT.name(), conf.getJobPriority().name());
     conf.setJobPriority(JobPriority.HIGH);
     assertEquals(JobPriority.HIGH.name(), conf.getJobPriority().name());
 
@@ -359,4 +359,49 @@ public class TestJobConf {
       jobConf.getMaxTaskFailuresPerTracker() < jobConf.getMaxReduceAttempts()
       );
   }
+
+  /**
+   * Test various Job Priority
+   */
+  @Test
+  public void testJobPriorityConf() {
+    JobConf conf = new JobConf();
+
+    // by default
+    assertEquals(JobPriority.DEFAULT.name(), conf.getJobPriority().name());
+    assertEquals(0, conf.getJobPriorityAsInteger());
+    // Set JobPriority.LOW using old API, and verify output from both getter
+    conf.setJobPriority(JobPriority.LOW);
+    assertEquals(JobPriority.LOW.name(), conf.getJobPriority().name());
+    assertEquals(2, conf.getJobPriorityAsInteger());
+
+    // Set JobPriority.VERY_HIGH using old API, and verify output
+    conf.setJobPriority(JobPriority.VERY_HIGH);
+    assertEquals(JobPriority.VERY_HIGH.name(), conf.getJobPriority().name());
+    assertEquals(5, conf.getJobPriorityAsInteger());
+
+    // Set 3 as priority using new API, and verify output from both getter
+    conf.setJobPriorityAsInteger(3);
+    assertEquals(JobPriority.NORMAL.name(), conf.getJobPriority().name());
+    assertEquals(3, conf.getJobPriorityAsInteger());
+
+    // Set 4 as priority using new API, and verify output
+    conf.setJobPriorityAsInteger(4);
+    assertEquals(JobPriority.HIGH.name(), conf.getJobPriority().name());
+    assertEquals(4, conf.getJobPriorityAsInteger());
+    // Now set some high integer values and verify output from old api
+    conf.setJobPriorityAsInteger(57);
+    assertEquals(JobPriority.UNDEFINED_PRIORITY.name(), conf.getJobPriority()
+        .name());
+    assertEquals(57, conf.getJobPriorityAsInteger());
+
+    // Error case where UNDEFINED_PRIORITY is set explicitly
+    conf.setJobPriority(JobPriority.UNDEFINED_PRIORITY);
+    assertEquals(JobPriority.UNDEFINED_PRIORITY.name(), conf.getJobPriority()
+        .name());
+
+    // As UNDEFINED_PRIORITY cannot be mapped to any integer value, resetting
+    // to default as 0.
+    assertEquals(0, conf.getJobPriorityAsInteger());
+  }
 }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapreduce/TestJob.java

@@ -41,7 +41,7 @@ public class TestJob {
     when(cluster.getClient()).thenReturn(client);
     JobID jobid = new JobID("1014873536921", 6);
     JobStatus status = new JobStatus(jobid, 0.0f, 0.0f, 0.0f, 0.0f,
-        State.FAILED, JobPriority.NORMAL, "root", "TestJobToString",
+        State.FAILED, JobPriority.DEFAULT, "root", "TestJobToString",
         "job file", "tracking url");
     when(client.getJobStatus(jobid)).thenReturn(status);
     when(client.getTaskReports(jobid, TaskType.MAP)).thenReturn(

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/main/java/org/apache/hadoop/mapred/YARNRunner.java

@@ -562,13 +562,30 @@ public class YARNRunner implements ClientProtocol {
       appContext.setApplicationTags(new HashSet<String>(tagsFromConf));
     }
 
+    String jobPriority = jobConf.get(MRJobConfig.PRIORITY);
+    if (jobPriority != null) {
+      int iPriority;
+      try {
+        iPriority = TypeConverter.toYarnApplicationPriority(jobPriority);
+      } catch (IllegalArgumentException e) {
+        iPriority = Integer.parseInt(jobPriority);
+      }
+      appContext.setPriority(Priority.newInstance(iPriority));
+    }
+
     return appContext;
   }
 
   @Override
   public void setJobPriority(JobID arg0, String arg1) throws IOException,
       InterruptedException {
-    resMgrDelegate.setJobPriority(arg0, arg1);
+    ApplicationId appId = TypeConverter.toYarn(arg0).getAppId();
+    try {
+      resMgrDelegate.updateApplicationPriority(appId,
+          Priority.newInstance(Integer.parseInt(arg1)));
+    } catch (YarnException e) {
+      throw new IOException(e);
+    }
   }
 
   @Override

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestYARNRunner.java

@@ -87,6 +87,7 @@ import org.apache.hadoop.yarn.api.records.ApplicationReport;
 import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
 import org.apache.hadoop.yarn.api.records.ContainerLaunchContext;
 import org.apache.hadoop.yarn.api.records.FinalApplicationStatus;
+import org.apache.hadoop.yarn.api.records.Priority;
 import org.apache.hadoop.yarn.api.records.QueueInfo;
 import org.apache.hadoop.yarn.api.records.YarnApplicationState;
 import org.apache.hadoop.yarn.api.records.YarnClusterMetrics;
@@ -604,6 +605,30 @@ public class TestYARNRunner extends TestCase {
     assertEquals("Bad SHELL setting", USER_SHELL, shell);
   }
 
+  @Test
+  public void testJobPriority() throws Exception {
+    JobConf jobConf = new JobConf();
+
+    jobConf.set(MRJobConfig.PRIORITY, "LOW");
+
+    YARNRunner yarnRunner = new YARNRunner(jobConf);
+    ApplicationSubmissionContext appSubCtx = buildSubmitContext(yarnRunner,
+        jobConf);
+
+    // 2 corresponds to LOW
+    assertEquals(appSubCtx.getPriority(), Priority.newInstance(2));
+
+    // Set an integer explicitly
+    jobConf.set(MRJobConfig.PRIORITY, "12");
+
+    yarnRunner = new YARNRunner(jobConf);
+    appSubCtx = buildSubmitContext(yarnRunner,
+        jobConf);
+
+    // Verify whether 12 is set to submission context
+    assertEquals(appSubCtx.getPriority(), Priority.newInstance(12));
+  }
+
   private ApplicationSubmissionContext buildSubmitContext(
       YARNRunner yarnRunner, JobConf jobConf) throws IOException {
     File jobxml = new File(testWorkDir, MRJobConfig.JOB_CONF_FILE);

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/TestMRJobClient.java

@@ -527,8 +527,9 @@ public class TestMRJobClient extends ClusterMapReduceTestCase {
     exitCode = runTool(conf, createJobClient(), new String[] { "-set-priority",
         jobId, "VERY_LOW" }, new ByteArrayOutputStream());
     assertEquals("Exit code", 0, exitCode);
-    // because this method does not implemented still.
+    // set-priority is fired after job is completed in YARN, hence need not
-    verifyJobPriority(jobId, "NORMAL", conf, createJobClient());
+    // have to update the priority.
+    verifyJobPriority(jobId, "DEFAULT", conf, createJobClient());
   }
 
   protected CLI createJobClient() throws IOException {

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapreduce/v2/TestMRJobs.java

@@ -66,6 +66,7 @@ import org.apache.hadoop.mapred.TaskLog;
 import org.apache.hadoop.mapreduce.Counters;
 import org.apache.hadoop.mapreduce.Job;
 import org.apache.hadoop.mapreduce.JobCounter;
+import org.apache.hadoop.mapreduce.JobPriority;
 import org.apache.hadoop.mapreduce.JobStatus;
 import org.apache.hadoop.mapreduce.MRConfig;
 import org.apache.hadoop.mapreduce.MRJobConfig;
@@ -159,6 +160,7 @@ public class TestMRJobs {
       Configuration conf = new Configuration();
       conf.set("fs.defaultFS", remoteFs.getUri().toString());   // use HDFS
       conf.set(MRJobConfig.MR_AM_STAGING_DIR, "/apps_staging_dir");
+      conf.setInt("yarn.cluster.max-application-priority", 10);
       mrCluster.init(conf);
       mrCluster.start();
     }
@@ -242,6 +244,67 @@ public class TestMRJobs {
     // JobStatus?)--compare against MRJobConfig.JOB_UBERTASK_ENABLE value
   }
 
+  @Test(timeout = 3000000)
+  public void testJobWithChangePriority() throws Exception {
+
+    if (!(new File(MiniMRYarnCluster.APPJAR)).exists()) {
+      LOG.info("MRAppJar " + MiniMRYarnCluster.APPJAR
+          + " not found. Not running test.");
+      return;
+    }
+
+    Configuration sleepConf = new Configuration(mrCluster.getConfig());
+    // set master address to local to test that local mode applied if framework
+    // equals local
+    sleepConf.set(MRConfig.MASTER_ADDRESS, "local");
+    sleepConf
+        .setInt("yarn.app.mapreduce.am.scheduler.heartbeat.interval-ms", 5);
+
+    SleepJob sleepJob = new SleepJob();
+    sleepJob.setConf(sleepConf);
+    Job job = sleepJob.createJob(1, 1, 1000, 20, 50, 1);
+
+    job.addFileToClassPath(APP_JAR); // The AppMaster jar itself.
+    job.setJarByClass(SleepJob.class);
+    job.setMaxMapAttempts(1); // speed up failures
+    job.submit();
+
+    // Set the priority to HIGH
+    job.setPriority(JobPriority.HIGH);
+    waitForPriorityToUpdate(job, JobPriority.HIGH);
+    // Verify the priority from job itself
+    Assert.assertEquals(job.getPriority(), JobPriority.HIGH);
+
+    // Change priority to NORMAL (3) with new api
+    job.setPriorityAsInteger(3); // Verify the priority from job itself
+    waitForPriorityToUpdate(job, JobPriority.NORMAL);
+    Assert.assertEquals(job.getPriority(), JobPriority.NORMAL);
+
+    // Change priority to a high integer value with new api
+    job.setPriorityAsInteger(89); // Verify the priority from job itself
+    waitForPriorityToUpdate(job, JobPriority.UNDEFINED_PRIORITY);
+    Assert.assertEquals(job.getPriority(), JobPriority.UNDEFINED_PRIORITY);
+
+    boolean succeeded = job.waitForCompletion(true);
+    Assert.assertTrue(succeeded);
+    Assert.assertEquals(JobStatus.State.SUCCEEDED, job.getJobState());
+  }
+
+  private void waitForPriorityToUpdate(Job job, JobPriority expectedStatus)
+      throws IOException, InterruptedException {
+    // Max wait time to get the priority update can be kept as 20sec (100 *
+    // 100ms)
+    int waitCnt = 200;
+    while (waitCnt-- > 0) {
+      if (job.getPriority().equals(expectedStatus)) {
+        // Stop waiting as priority is updated.
+        break;
+      } else {
+        Thread.sleep(100);
+      }
+    }
+  }
+
   @Test(timeout = 300000)
   public void testConfVerificationWithClassloader() throws Exception {
     testConfVerification(true, false, false, false);