YARN-7118. AHS REST API can return NullPointerException. Contributed by Billie Rinaldi.

(cherry picked from commit 4002bf0a9e7e3619a3bdcff071f0369cbf2873ad)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/src/test/java/org/apache/hadoop/yarn/server/applicationhistoryservice/TestApplicationHistoryManagerOnTimelineStore.java

@@ -146,7 +146,11 @@ public class TestApplicationHistoryManagerOnTimelineStore {
       } else if (i == 3) {
         entities.addEntity(createApplicationTimelineEntity(
             appId, false, false, false, false, YarnApplicationState.FINISHED,
-            true));
+            true, false));
+      } else if (i == SCALE + 1) {
+        entities.addEntity(createApplicationTimelineEntity(
+            appId, false, false, false, false, YarnApplicationState.FINISHED,
+            false, true));
       } else {
         entities.addEntity(createApplicationTimelineEntity(
             appId, false, false, false, false, YarnApplicationState.FINISHED));
@@ -497,13 +501,14 @@ public class TestApplicationHistoryManagerOnTimelineStore {
       boolean wrongAppId, boolean enableUpdateEvent,
       YarnApplicationState state) {
     return createApplicationTimelineEntity(appId, emptyACLs, noAttemptId,
-        wrongAppId, enableUpdateEvent, state, false);
+        wrongAppId, enableUpdateEvent, state, false, false);
   }
 
   private static TimelineEntity createApplicationTimelineEntity(
       ApplicationId appId, boolean emptyACLs, boolean noAttemptId,
       boolean wrongAppId, boolean enableUpdateEvent,
-      YarnApplicationState state, boolean missingPreemptMetrics) {
+      YarnApplicationState state, boolean missingPreemptMetrics,
+      boolean missingQueue) {
     TimelineEntity entity = new TimelineEntity();
     entity.setEntityType(ApplicationMetricsConstants.ENTITY_TYPE);
     if (wrongAppId) {
@@ -519,7 +524,10 @@ public class TestApplicationHistoryManagerOnTimelineStore {
     entityInfo.put(ApplicationMetricsConstants.TYPE_ENTITY_INFO,
         "test app type");
     entityInfo.put(ApplicationMetricsConstants.USER_ENTITY_INFO, "user1");
-    entityInfo.put(ApplicationMetricsConstants.QUEUE_ENTITY_INFO, "test queue");
+    if (!missingQueue) {
+      entityInfo.put(ApplicationMetricsConstants.QUEUE_ENTITY_INFO,
+          "test queue");
+    }
     entityInfo.put(
         ApplicationMetricsConstants.UNMANAGED_APPLICATION_ENTITY_INFO, "false");
     entityInfo.put(ApplicationMetricsConstants.APPLICATION_PRIORITY_INFO,

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/src/test/java/org/apache/hadoop/yarn/server/applicationhistoryservice/webapp/TestAHSWebServices.java

@@ -100,7 +100,7 @@ public class TestAHSWebServices extends JerseyTestBase {
   private static ApplicationHistoryClientService historyClientService;
   private static AHSWebServices ahsWebservice;
   private static final String[] USERS = new String[] { "foo" , "bar" };
-  private static final int MAX_APPS = 5;
+  private static final int MAX_APPS = 6;
   private static Configuration conf;
   private static FileSystem fs;
   private static final String remoteLogRootDir = "target/logs/";
@@ -364,7 +364,27 @@ public class TestAHSWebServices extends JerseyTestBase {
     JSONObject apps = json.getJSONObject("apps");
     assertEquals("incorrect number of elements", 1, apps.length());
     JSONArray array = apps.getJSONArray("app");
-    assertEquals("incorrect number of elements", 5, array.length());
+    assertEquals("incorrect number of elements", MAX_APPS, array.length());
+  }
+
+  @Test
+  public void testQueueQuery() throws Exception {
+    WebResource r = resource();
+    ClientResponse response =
+        r.path("ws").path("v1").path("applicationhistory").path("apps")
+            .queryParam("queue", "test queue")
+            .queryParam("user.name", USERS[round])
+            .accept(MediaType.APPLICATION_JSON).get(ClientResponse.class);
+    assertResponseStatusCode(Status.OK, response.getStatusInfo());
+    assertEquals(MediaType.APPLICATION_JSON + "; " + JettyUtils.UTF_8,
+        response.getType().toString());
+    JSONObject json = response.getEntity(JSONObject.class);
+    assertEquals("incorrect number of elements", 1, json.length());
+    JSONObject apps = json.getJSONObject("apps");
+    assertEquals("incorrect number of elements", 1, apps.length());
+    JSONArray array = apps.getJSONArray("app");
+    assertEquals("incorrect number of elements", MAX_APPS - 1,
+        array.length());
   }
 
   @Test
@@ -414,7 +434,7 @@ public class TestAHSWebServices extends JerseyTestBase {
     JSONObject appAttempts = json.getJSONObject("appAttempts");
     assertEquals("incorrect number of elements", 1, appAttempts.length());
     JSONArray array = appAttempts.getJSONArray("appAttempt");
-    assertEquals("incorrect number of elements", 5, array.length());
+    assertEquals("incorrect number of elements", MAX_APPS, array.length());
   }
 
   @Test
@@ -471,7 +491,7 @@ public class TestAHSWebServices extends JerseyTestBase {
     JSONObject containers = json.getJSONObject("containers");
     assertEquals("incorrect number of elements", 1, containers.length());
     JSONArray array = containers.getJSONArray("container");
-    assertEquals("incorrect number of elements", 5, array.length());
+    assertEquals("incorrect number of elements", MAX_APPS, array.length());
   }
 
   @Test

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/webapp/WebServices.java

@@ -192,7 +192,8 @@ public class WebServices {
         }
       }
       if (queueQuery != null && !queueQuery.isEmpty()) {
-        if (!appReport.getQueue().equals(queueQuery)) {
+        if (appReport.getQueue() == null || !appReport.getQueue()
+            .equals(queueQuery)) {
           continue;
         }
       }