MAPREDUCE-5867. Fix NPE in KillAMPreemptionPolicy related to ProportionalCapacityPreemptionPolicy. Contributed by Sunil G.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1595754 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -139,6 +139,9 @@ Trunk (Unreleased)
 
     MAPREDUCE-5717. Task pings are interpreted as task progress (jlowe)
 
+    MAPREDUCE-5867. Fix NPE in KillAMPreemptionPolicy related to 
+    ProportionalCapacityPreemptionPolicy (Sunil G via devaraj)
+
 Release 2.5.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/rm/preemption/KillAMPreemptionPolicy.java

@@ -29,7 +29,9 @@
 import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptEventType;
 import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.api.records.PreemptionContainer;
+import org.apache.hadoop.yarn.api.records.PreemptionContract;
 import org.apache.hadoop.yarn.api.records.PreemptionMessage;
+import org.apache.hadoop.yarn.api.records.StrictPreemptionContract;
 import org.apache.hadoop.yarn.event.EventHandler;
 
 /**
@@ -52,15 +54,20 @@ public void init(AppContext context) {
   public void preempt(Context ctxt, PreemptionMessage preemptionRequests) {
     // for both strict and negotiable preemption requests kill the
     // container
-    for (PreemptionContainer c :
+    StrictPreemptionContract strictContract = preemptionRequests
-        preemptionRequests.getStrictContract().getContainers()) {
+        .getStrictContract();
+    if (strictContract != null) {
+      for (PreemptionContainer c : strictContract.getContainers()) {
         killContainer(ctxt, c);
       }
-    for (PreemptionContainer c :
+    }
-         preemptionRequests.getContract().getContainers()) {
+    PreemptionContract contract = preemptionRequests.getContract();
+    if (contract != null) {
+      for (PreemptionContainer c : contract.getContainers()) {
         killContainer(ctxt, c);
       }
     }
+  }
 
   @SuppressWarnings("unchecked")
   private void killContainer(Context ctxt, PreemptionContainer c){

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

@@ -0,0 +1,144 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.mapreduce.v2.app;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.hadoop.mapreduce.v2.api.records.TaskType;
+import org.apache.hadoop.mapreduce.v2.app.MRAppMaster.RunningAppContext;
+import org.apache.hadoop.mapreduce.v2.app.job.event.JobCounterUpdateEvent;
+import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptEvent;
+import org.apache.hadoop.mapreduce.v2.app.rm.preemption.AMPreemptionPolicy;
+import org.apache.hadoop.mapreduce.v2.app.rm.preemption.KillAMPreemptionPolicy;
+import org.apache.hadoop.mapreduce.v2.util.MRBuilderUtils;
+import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
+import org.apache.hadoop.yarn.api.records.ApplicationId;
+import org.apache.hadoop.yarn.api.records.Container;
+import org.apache.hadoop.yarn.api.records.ContainerId;
+import org.apache.hadoop.yarn.api.records.PreemptionContainer;
+import org.apache.hadoop.yarn.api.records.PreemptionContract;
+import org.apache.hadoop.yarn.api.records.PreemptionMessage;
+import org.apache.hadoop.yarn.api.records.StrictPreemptionContract;
+import org.apache.hadoop.yarn.event.EventHandler;
+import org.apache.hadoop.yarn.factories.RecordFactory;
+import org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider;
+import org.junit.Test;
+
+public class TestKillAMPreemptionPolicy {
+  private final RecordFactory recordFactory = RecordFactoryProvider
+      .getRecordFactory(null);
+
+  @SuppressWarnings("unchecked")
+  @Test
+  public void testKillAMPreemptPolicy() {
+
+    ApplicationId appId = ApplicationId.newInstance(123456789, 1);
+    ContainerId container = ContainerId.newInstance(
+        ApplicationAttemptId.newInstance(appId, 1), 1);
+    AMPreemptionPolicy.Context mPctxt = mock(AMPreemptionPolicy.Context.class);
+    when(mPctxt.getTaskAttempt(any(ContainerId.class))).thenReturn(
+        MRBuilderUtils.newTaskAttemptId(MRBuilderUtils.newTaskId(
+            MRBuilderUtils.newJobId(appId, 1), 1, TaskType.MAP), 0));
+    List<Container> p = new ArrayList<Container>();
+    p.add(Container.newInstance(container, null, null, null, null, null));
+    when(mPctxt.getContainers(any(TaskType.class))).thenReturn(p);
+
+    KillAMPreemptionPolicy policy = new KillAMPreemptionPolicy();
+
+    // strictContract is null & contract is null
+    RunningAppContext mActxt = getRunningAppContext();
+    policy.init(mActxt);
+    PreemptionMessage pM = getPreemptionMessage(false, false, container);
+    policy.preempt(mPctxt, pM);
+    verify(mActxt.getEventHandler(), times(0)).handle(
+        any(TaskAttemptEvent.class));
+    verify(mActxt.getEventHandler(), times(0)).handle(
+        any(JobCounterUpdateEvent.class));
+
+    // strictContract is not null & contract is null
+    mActxt = getRunningAppContext();
+    policy.init(mActxt);
+    pM = getPreemptionMessage(true, false, container);
+    policy.preempt(mPctxt, pM);
+    verify(mActxt.getEventHandler(), times(2)).handle(
+        any(TaskAttemptEvent.class));
+    verify(mActxt.getEventHandler(), times(2)).handle(
+        any(JobCounterUpdateEvent.class));
+
+    // strictContract is null & contract is not null
+    mActxt = getRunningAppContext();
+    policy.init(mActxt);
+    pM = getPreemptionMessage(false, true, container);
+    policy.preempt(mPctxt, pM);
+    verify(mActxt.getEventHandler(), times(2)).handle(
+        any(TaskAttemptEvent.class));
+    verify(mActxt.getEventHandler(), times(2)).handle(
+        any(JobCounterUpdateEvent.class));
+
+    // strictContract is not null & contract is not null
+    mActxt = getRunningAppContext();
+    policy.init(mActxt);
+    pM = getPreemptionMessage(true, true, container);
+    policy.preempt(mPctxt, pM);
+    verify(mActxt.getEventHandler(), times(4)).handle(
+        any(TaskAttemptEvent.class));
+    verify(mActxt.getEventHandler(), times(4)).handle(
+        any(JobCounterUpdateEvent.class));
+  }
+
+  private RunningAppContext getRunningAppContext() {
+    RunningAppContext mActxt = mock(RunningAppContext.class);
+    EventHandler<?> eventHandler = mock(EventHandler.class);
+    when(mActxt.getEventHandler()).thenReturn(eventHandler);
+    return mActxt;
+  }
+
+  private PreemptionMessage getPreemptionMessage(boolean strictContract,
+      boolean contract, final ContainerId container) {
+    PreemptionMessage preemptionMessage = recordFactory
+        .newRecordInstance(PreemptionMessage.class);
+    Set<PreemptionContainer> cntrs = new HashSet<PreemptionContainer>();
+    PreemptionContainer preemptContainer = recordFactory
+        .newRecordInstance(PreemptionContainer.class);
+    preemptContainer.setId(container);
+    cntrs.add(preemptContainer);
+    if (strictContract) {
+      StrictPreemptionContract set = recordFactory
+          .newRecordInstance(StrictPreemptionContract.class);
+      set.setContainers(cntrs);
+      preemptionMessage.setStrictContract(set);
+    }
+    if (contract) {
+      PreemptionContract preemptContract = recordFactory
+          .newRecordInstance(PreemptionContract.class);
+      preemptContract.setContainers(cntrs);
+      preemptionMessage.setContract(preemptContract);
+    }
+    return preemptionMessage;
+  }
+
+}