YARN-7913. Improve error handling when application recovery fails with exception. Contributed by Wilfred Spiegelenburg

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java

@@ -477,12 +477,25 @@ public class FairScheduler extends
     writeLock.lock();
     try {
       RMApp rmApp = rmContext.getRMApps().get(applicationId);
+      // This will re-create the queue on restore, however this could fail if
+      // the config was changed.
       FSLeafQueue queue = assignToQueue(rmApp, queueName, user);
       if (queue == null) {
+        if (!isAppRecovering) {
           return;
         }
+        // app is recovering we do not want to fail the app now as it was there
+        // before we started the recovery. Add it to the recovery queue:
+        // dynamic queue directly under root, no ACL needed (auto clean up)
+        queueName = "root.recovery";
+        queue = queueMgr.getLeafQueue(queueName, true);
+      }
 
-      if (rmApp != null && rmApp.getAMResourceRequests() != null) {
+      // when recovering the NMs might not have registered and we could have
+      // no resources in the queue, the app is already running and has thus
+      // passed all these checks, skip them now.
+      if (!isAppRecovering && rmApp != null &&
+          rmApp.getAMResourceRequests() != null) {
         // Resources.fitsIn would always return false when queueMaxShare is 0
         // for any resource, but only using Resources.fitsIn is not enough
         // is it would return false for such cases when the requested
@@ -507,6 +520,9 @@ public class FairScheduler extends
         }
       }
 
+      // Skip ACL check for recovering applications: they have been accepted
+      // in the queue already recovery should not break that.
+      if (!isAppRecovering) {
         // Enforce ACLs
         UserGroupInformation userUgi = UserGroupInformation.createRemoteUser(
             user);
@@ -519,6 +535,7 @@ public class FairScheduler extends
           rejectApplicationWithMessage(applicationId, msg);
           return;
         }
+      }
 
       SchedulerApplication<FSAppAttempt> application =
           new SchedulerApplication<FSAppAttempt>(queue, user);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairSchedulerTestBase.java

@@ -260,6 +260,26 @@ public class FairSchedulerTestBase {
     scheduler.update();
   }
 
+  protected ApplicationAttemptId createRecoveringApplication(
+      Resource amResource, String queueId, String userId) {
+    ApplicationAttemptId id =
+        createAppAttemptId(this.APP_ID++, this.ATTEMPT_ID++);
+
+    // On restore the app is already created but we need to check the AM
+    // resource, make sure it is set for test
+    ResourceRequest amRequest = createResourceRequest(
+        // cast to int as we're not testing large values so it is safe
+        (int)amResource.getMemorySize(), amResource.getVirtualCores(),
+        ResourceRequest.ANY, 1, 1, true);
+    List<ResourceRequest> amReqs = new ArrayList<>();
+    amReqs.add(amRequest);
+    createApplicationWithAMResourceInternal(id, queueId, userId, amResource,
+        amReqs);
+
+    scheduler.addApplication(id.getApplicationId(), queueId, userId, true);
+    return id;
+  }
+
   protected void createApplicationWithAMResource(ApplicationAttemptId attId,
       String queue, String user, Resource amResource) {
     createApplicationWithAMResourceInternal(attId, queue, user, amResource,

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFairScheduler.java

@@ -5766,4 +5766,131 @@ public class TestFairScheduler extends FairSchedulerTestBase {
 
     createSchedulingRequest(memory, vCores, "queueA", "user1", 1, 2);
   }
+
+  @Test
+  public void testRestoreToExistingQueue() throws IOException {
+    conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
+    generateAllocationFilePercentageResource();
+
+    scheduler.init(conf);
+    scheduler.start();
+    scheduler.reinitialize(conf, resourceManager.getRMContext());
+
+    // no nodes so the resource total should be zero for all queues
+    // AM is using resources
+    Resource amResource = Resources.createResource(1024, 1);
+    // Add the app and the attempt
+    ApplicationAttemptId appAttemptId = null;
+    String queueId = "root.parent.queueA";
+    try {
+      appAttemptId = createRecoveringApplication(amResource, queueId, "user1");
+    } catch (Exception e) {
+      fail("The exception is not expected. Exception message: "
+          + e.getMessage());
+    }
+    scheduler.addApplicationAttempt(appAttemptId, false, true);
+
+    List<ApplicationAttemptId> appsInQueue =
+        scheduler.getAppsInQueue(queueId);
+    assertEquals("Number of apps in queue 'root.parent.queueA' should be one!",
+        1, appsInQueue.size());
+
+    appAttemptId = scheduler.getAppsInQueue(queueId).get(0);
+    assertNotNull("Scheduler app for appAttemptId " + appAttemptId
+        + " should not be null!", scheduler.getSchedulerApp(appAttemptId));
+
+    FSAppAttempt schedulerApp = scheduler.getSchedulerApp(appAttemptId);
+    assertNotNull("Scheduler app queueInfo for appAttemptId " + appAttemptId
+        + " should not be null!", schedulerApp.getAppSchedulingInfo());
+
+    assertTrue("There should be no requests accepted", schedulerApp
+        .getAppSchedulingInfo().getAllResourceRequests().isEmpty());
+
+    // Restore an applications with a user that has no access to the queue
+    try {
+      appAttemptId = createRecoveringApplication(amResource, queueId,
+        "usernotinacl");
+    } catch (Exception e) {
+      fail("The exception is not expected. Exception message: "
+          + e.getMessage());
+    }
+    scheduler.addApplicationAttempt(appAttemptId, false, true);
+
+    appsInQueue = scheduler.getAppsInQueue(queueId);
+    assertEquals("Number of apps in queue 'root.parent.queueA' should be two!",
+        2, appsInQueue.size());
+
+    appAttemptId = scheduler.getAppsInQueue(queueId).get(1);
+    assertNotNull("Scheduler app for appAttemptId " + appAttemptId
+        + " should not be null!", scheduler.getSchedulerApp(appAttemptId));
+
+    schedulerApp = scheduler.getSchedulerApp(appAttemptId);
+    assertNotNull("Scheduler app queueInfo for appAttemptId " + appAttemptId
+        + " should not be null!", schedulerApp.getAppSchedulingInfo());
+
+    assertTrue("There should be no requests accepted", schedulerApp
+        .getAppSchedulingInfo().getAllResourceRequests().isEmpty());
+  }
+
+  @Test
+  public void testRestoreToParentQueue() throws IOException {
+    conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
+    generateAllocationFilePercentageResource();
+
+    scheduler.init(conf);
+    scheduler.start();
+    scheduler.reinitialize(conf, resourceManager.getRMContext());
+
+    // no nodes so the resource total should be zero for all queues
+    // AM is using resources
+    Resource amResource = Resources.createResource(1024, 1);
+    // Add the app and the attempt, use a queue that is now a parent
+    ApplicationAttemptId appAttemptId = null;
+    String queueId = "root.parent";
+    try {
+      appAttemptId = createRecoveringApplication(amResource, queueId, "user1");
+    } catch (Exception e) {
+      fail("The exception is not expected. Exception message: "
+          + e.getMessage());
+    }
+    scheduler.addApplicationAttempt(appAttemptId, false, true);
+
+    String recoveredQueue = "root.recovery";
+    List<ApplicationAttemptId> appsInQueue =
+        scheduler.getAppsInQueue(recoveredQueue);
+    assertEquals("Number of apps in queue 'root.recovery' should be one!",
+        1, appsInQueue.size());
+
+    appAttemptId =
+        scheduler.getAppsInQueue(recoveredQueue).get(0);
+    assertNotNull("Scheduler app for appAttemptId " + appAttemptId
+        + " should not be null!", scheduler.getSchedulerApp(appAttemptId));
+
+    FSAppAttempt schedulerApp = scheduler.getSchedulerApp(appAttemptId);
+    assertNotNull("Scheduler app queueInfo for appAttemptId " + appAttemptId
+        + " should not be null!", schedulerApp.getAppSchedulingInfo());
+
+    assertTrue("There should be no requests accepted", schedulerApp
+        .getAppSchedulingInfo().getAllResourceRequests().isEmpty());
+  }
+
+  private void generateAllocationFilePercentageResource()
+      throws IOException {
+    PrintWriter out = new PrintWriter(new FileWriter(ALLOC_FILE));
+    out.println("<?xml version=\"1.0\"?>");
+    out.println("<allocations>");
+    out.println("<queue name=\"root\">");
+    out.println("<aclSubmitApps> </aclSubmitApps>");
+    out.println("<aclAdministerApps> </aclAdministerApps>");
+    out.println("<queue name=\"parent\">");
+    out.println("<maxChildResources>memory-mb=15.0%, vcores=15.0%" +
+        "</maxChildResources>");
+    out.println("<queue name=\"queueA\">");
+    out.println("<aclSubmitApps>user1</aclSubmitApps>");
+    out.println("</queue>");
+    out.println("</queue>");
+    out.println("</queue>");
+    out.println("</allocations>");
+    out.close();
+  }
 }