YARN-9848. Revert YARN-4946. Contributed by Steven Rand.

(cherry picked from commit 6ef01646ba)
(cherry picked from commit 62ee5970f8)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/RMAppManager.java

@@ -93,7 +93,7 @@ public class RMAppManager implements EventHandler<RMAppManagerEvent>,
   private int maxCompletedAppsInMemory;
   private int maxCompletedAppsInStateStore;
   protected int completedAppsInStateStore = 0;
-  protected LinkedList<ApplicationId> completedApps = new LinkedList<>();
+  private LinkedList<ApplicationId> completedApps = new LinkedList<>();
 
   private final RMContext rmContext;
   private final ApplicationMasterService masterService;
@@ -316,71 +316,30 @@ public class RMAppManager implements EventHandler<RMAppManagerEvent>,
    * check to see if hit the limit for max # completed apps kept
    */
   protected synchronized void checkAppNumCompletedLimit() {
-    if (completedAppsInStateStore > maxCompletedAppsInStateStore) {
+    // check apps kept in state store.
-      removeCompletedAppsFromStateStore();
+    while (completedAppsInStateStore > this.maxCompletedAppsInStateStore) {
-    }
+      ApplicationId removeId =
-
+          completedApps.get(completedApps.size() - completedAppsInStateStore);
-    if (completedApps.size() > maxCompletedAppsInMemory) {
-      removeCompletedAppsFromMemory();
-    }
-  }
-
-  private void removeCompletedAppsFromStateStore() {
-    int numDelete = completedAppsInStateStore - maxCompletedAppsInStateStore;
-    for (int i = 0; i < numDelete; i++) {
-      ApplicationId removeId = completedApps.get(i);
       RMApp removeApp = rmContext.getRMApps().get(removeId);
-      boolean deleteApp = shouldDeleteApp(removeApp);
-
-      if (deleteApp) {
       LOG.info("Max number of completed apps kept in state store met:"
-            + " maxCompletedAppsInStateStore = "
+          + " maxCompletedAppsInStateStore = " + maxCompletedAppsInStateStore
-            + maxCompletedAppsInStateStore + ", removing app " + removeId
+          + ", removing app " + removeApp.getApplicationId()
           + " from state store.");
       rmContext.getStateStore().removeApplication(removeApp);
       completedAppsInStateStore--;
-      } else {
-        LOG.info("Max number of completed apps kept in state store met:"
-            + " maxCompletedAppsInStateStore = "
-            + maxCompletedAppsInStateStore + ", but not removing app "
-            + removeId
-            + " from state store as log aggregation have not finished yet.");
-      }
-    }
     }
 
-  private void removeCompletedAppsFromMemory() {
+    // check apps kept in memory.
-    int numDelete = completedApps.size() - maxCompletedAppsInMemory;
+    while (completedApps.size() > this.maxCompletedAppsInMemory) {
-    int offset = 0;
+      ApplicationId removeId = completedApps.remove();
-    for (int i = 0; i < numDelete; i++) {
-      int deletionIdx = i - offset;
-      ApplicationId removeId = completedApps.get(deletionIdx);
-      RMApp removeApp = rmContext.getRMApps().get(removeId);
-      boolean deleteApp = shouldDeleteApp(removeApp);
-
-      if (deleteApp) {
-        ++offset;
       LOG.info("Application should be expired, max number of completed apps"
           + " kept in memory met: maxCompletedAppsInMemory = "
           + this.maxCompletedAppsInMemory + ", removing app " + removeId
           + " from memory: ");
-        completedApps.remove(deletionIdx);
       rmContext.getRMApps().remove(removeId);
       this.applicationACLsManager.removeApplication(removeId);
-      } else {
-        LOG.info("Application should be expired, max number of completed apps"
-                + " kept in memory met: maxCompletedAppsInMemory = "
-                + this.maxCompletedAppsInMemory + ", but not removing app "
-                + removeId
-                + " from memory as log aggregation have not finished yet.");
     }
   }
-  }
-
-  private boolean shouldDeleteApp(RMApp app) {
-    return !app.isLogAggregationEnabled()
-            || app.isLogAggregationFinished();
-  }
 
   @SuppressWarnings("unchecked")
   protected void submitApplication(

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMApp.java

@@ -243,10 +243,6 @@ public interface RMApp extends EventHandler<RMAppEvent> {
    */
   int getMaxAppAttempts();
 
-  boolean isLogAggregationEnabled();
-
-  boolean isLogAggregationFinished();
-
   /**
    * Returns the application type
    * @return the application type.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java

@@ -1765,16 +1765,6 @@ public class RMAppImpl implements RMApp, Recoverable {
     logAggregation.aggregateLogReport(nodeId, report, this);
   }
 
-  @Override
-  public boolean isLogAggregationFinished() {
-    return logAggregation.isFinished();
-  }
-
-  @Override
-  public boolean isLogAggregationEnabled() {
-    return logAggregation.isEnabled();
-  }
-
   public String getLogAggregationFailureMessagesForNM(NodeId nodeId) {
     return logAggregation.getLogAggregationFailureMessagesForNM(nodeId);
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/AppManagerTestBase.java

@@ -18,24 +18,15 @@
 
 package org.apache.hadoop.yarn.server.resourcemanager;
 
-import static java.util.stream.Collectors.toSet;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-
-import java.util.List;
-import java.util.Set;
-
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ApplicationSubmissionContext;
 import org.apache.hadoop.yarn.exceptions.YarnException;
 import org.apache.hadoop.yarn.server.resourcemanager.placement.PlacementManager;
 import org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore;
-import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMApp;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.YarnScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.security.ClientToAMTokenSecretManagerInRM;
 import org.apache.hadoop.yarn.server.security.ApplicationACLsManager;
-import org.mockito.ArgumentCaptor;
 
 /**
  * Base class for AppManager related test.
@@ -76,28 +67,6 @@ public class AppManagerTestBase {
       return this.completedAppsInStateStore;
     }
 
-    public List<ApplicationId> getCompletedApps() {
-      return completedApps;
-    }
-
-    public Set<ApplicationId> getFirstNCompletedApps(int n) {
-      return getCompletedApps().stream().limit(n).collect(toSet());
-    }
-
-    public Set<ApplicationId> getCompletedAppsWithEvenIdsInRange(int n) {
-      return getCompletedApps().stream().limit(n)
-          .filter(app -> app.getId() % 2 == 0).collect(toSet());
-    }
-
-    public Set<ApplicationId> getRemovedAppsFromStateStore(int numRemoves) {
-      ArgumentCaptor<RMApp> argumentCaptor =
-          ArgumentCaptor.forClass(RMApp.class);
-      verify(stateStore, times(numRemoves))
-          .removeApplication(argumentCaptor.capture());
-      return argumentCaptor.getAllValues().stream().map(RMApp::getApplicationId)
-          .collect(toSet());
-    }
-
     public void submitApplication(
         ApplicationSubmissionContext submissionContext, String user)
         throws YarnException {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestAppManager.java

@@ -89,7 +89,6 @@ import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -143,52 +142,12 @@ public class TestAppManager extends AppManagerTestBase{
     return list;
   }
 
-  private static List<RMApp> newRMAppsMixedLogAggregationStatus(int n,
-      long time, RMAppState state) {
-    List<RMApp> list = Lists.newArrayList();
-    for (int i = 0; i < n; ++i) {
-      MockRMApp rmApp = new MockRMApp(i, time, state);
-      rmApp.setLogAggregationEnabled(true);
-      rmApp.setLogAggregationFinished(i % 2 == 0);
-      list.add(rmApp);
-    }
-    return list;
-  }
-
   public RMContext mockRMContext(int n, long time) {
-    final ConcurrentMap<ApplicationId, RMApp> map = createRMAppsMap(n, time);
-    return createMockRMContextInternal(map);
-  }
-
-  public RMContext mockRMContextWithMixedLogAggregationStatus(int n,
-      long time) {
-    final ConcurrentMap<ApplicationId, RMApp> map =
-        createRMAppsMapMixedLogAggStatus(n, time);
-    return createMockRMContextInternal(map);
-  }
-
-  private ConcurrentMap<ApplicationId, RMApp> createRMAppsMap(int n,
-      long time) {
     final List<RMApp> apps = newRMApps(n, time, RMAppState.FINISHED);
     final ConcurrentMap<ApplicationId, RMApp> map = Maps.newConcurrentMap();
     for (RMApp app : apps) {
       map.put(app.getApplicationId(), app);
     }
-    return map;
-  }
-
-  private ConcurrentMap<ApplicationId, RMApp> createRMAppsMapMixedLogAggStatus(
-      int n, long time) {
-    final List<RMApp> apps =
-        newRMAppsMixedLogAggregationStatus(n, time, RMAppState.FINISHED);
-    final ConcurrentMap<ApplicationId, RMApp> map = Maps.newConcurrentMap();
-    for (RMApp app : apps) {
-      map.put(app.getApplicationId(), app);
-    }
-    return map;
-  }
-
-  private RMContext createMockRMContextInternal(ConcurrentMap<ApplicationId, RMApp> map) {
     Dispatcher rmDispatcher = new AsyncDispatcher();
     ContainerAllocationExpirer containerAllocationExpirer = new ContainerAllocationExpirer(
             rmDispatcher);
@@ -240,12 +199,8 @@ public class TestAppManager extends AppManagerTestBase{
     }   
   }
 
-  private void addToCompletedApps(TestRMAppManager appMonitor,
+  protected void addToCompletedApps(TestRMAppManager appMonitor, RMContext rmContext) {
-          RMContext rmContext) {
+    for (RMApp app : rmContext.getRMApps().values()) {
-    // ensure applications are finished in order by their IDs
-    List<RMApp> sortedApps = new ArrayList<>(rmContext.getRMApps().values());
-    sortedApps.sort(Comparator.comparingInt(o -> o.getApplicationId().getId()));
-    for (RMApp app : sortedApps) {
       if (app.getState() == RMAppState.FINISHED
           || app.getState() == RMAppState.KILLED
           || app.getState() == RMAppState.FAILED) {
@@ -654,32 +609,18 @@ public class TestAppManager extends AppManagerTestBase{
     addToCompletedApps(appMonitor, rmContext);
     Assert.assertEquals("Number of completed apps incorrect", allApps,
         appMonitor.getCompletedAppsListSize());
-
-    int numRemoveAppsFromStateStore = allApps - maxAppsInStateStore;
-    Set<ApplicationId> appsShouldBeRemovedFromStateStore = appMonitor
-            .getFirstNCompletedApps(numRemoveAppsFromStateStore);
     appMonitor.checkAppNumCompletedLimit();
 
-    Set<ApplicationId> removedAppsFromStateStore = appMonitor
-            .getRemovedAppsFromStateStore(numRemoveAppsFromStateStore);
-
     Assert.assertEquals("Number of apps incorrect after # completed check",
       maxAppsInMemory, rmContext.getRMApps().size());
     Assert.assertEquals("Number of completed apps incorrect after check",
       maxAppsInMemory, appMonitor.getCompletedAppsListSize());
 
+    int numRemoveAppsFromStateStore = 10 - maxAppsInStateStore;
     verify(rmContext.getStateStore(), times(numRemoveAppsFromStateStore))
       .removeApplication(isA(RMApp.class));
     Assert.assertEquals(maxAppsInStateStore,
       appMonitor.getNumberOfCompletedAppsInStateStore());
-
-    List<ApplicationId> completedApps = appMonitor.getCompletedApps();
-    Assert.assertEquals(maxAppsInMemory, completedApps.size());
-    Assert.assertEquals(numRemoveAppsFromStateStore,
-        removedAppsFromStateStore.size());
-    Assert.assertEquals(numRemoveAppsFromStateStore,
-        Sets.intersection(appsShouldBeRemovedFromStateStore,
-            removedAppsFromStateStore).size());
   }
 
   @Test
@@ -697,12 +638,9 @@ public class TestAppManager extends AppManagerTestBase{
     addToCompletedApps(appMonitor, rmContext);
     Assert.assertEquals("Number of completed apps incorrect", allApps,
         appMonitor.getCompletedAppsListSize());
-
-    int numRemoveApps = allApps - maxAppsInMemory;
-    Set<ApplicationId> appsShouldBeRemoved = appMonitor
-            .getFirstNCompletedApps(numRemoveApps);
     appMonitor.checkAppNumCompletedLimit();
 
+    int numRemoveApps = allApps - maxAppsInMemory;
     Assert.assertEquals("Number of apps incorrect after # completed check",
       maxAppsInMemory, rmContext.getRMApps().size());
     Assert.assertEquals("Number of completed apps incorrect after check",
@@ -711,56 +649,6 @@ public class TestAppManager extends AppManagerTestBase{
       isA(RMApp.class));
     Assert.assertEquals(maxAppsInMemory,
       appMonitor.getNumberOfCompletedAppsInStateStore());
-
-    List<ApplicationId> completedApps = appMonitor.getCompletedApps();
-    Assert.assertEquals(maxAppsInMemory, completedApps.size());
-    Assert.assertEquals(numRemoveApps, appsShouldBeRemoved.size());
-    assertTrue(Collections.disjoint(completedApps, appsShouldBeRemoved));
-  }
-
-  @Test
-  public void testStateStoreAppLimitSomeAppsHaveNotFinishedLogAggregation() {
-    long now = System.currentTimeMillis();
-    final int allApps = 10;
-    RMContext rmContext =
-        mockRMContextWithMixedLogAggregationStatus(allApps, now - 20000);
-    Configuration conf = new YarnConfiguration();
-    int maxAppsInMemory = 2;
-    conf.setInt(YarnConfiguration.RM_MAX_COMPLETED_APPLICATIONS,
-        maxAppsInMemory);
-    // greater than maxCompletedAppsInMemory, reset to
-    // RM_MAX_COMPLETED_APPLICATIONS.
-    conf.setInt(YarnConfiguration.RM_STATE_STORE_MAX_COMPLETED_APPLICATIONS,
-        1000);
-    TestRMAppManager appMonitor = new TestRMAppManager(rmContext, conf);
-
-    addToCompletedApps(appMonitor, rmContext);
-    Assert.assertEquals("Number of completed apps incorrect", allApps,
-            appMonitor.getCompletedAppsListSize());
-
-    int numRemoveApps = allApps - maxAppsInMemory;
-    int effectiveNumRemoveApps = numRemoveApps / 2;
-    //only apps with even ID would be deleted due to log aggregation status
-    int expectedNumberOfAppsInMemory = maxAppsInMemory + effectiveNumRemoveApps;
-
-    Set<ApplicationId> appsShouldBeRemoved = appMonitor
-            .getCompletedAppsWithEvenIdsInRange(numRemoveApps);
-    appMonitor.checkAppNumCompletedLimit();
-
-    Assert.assertEquals("Number of apps incorrect after # completed check",
-        expectedNumberOfAppsInMemory, rmContext.getRMApps().size());
-    Assert.assertEquals("Number of completed apps incorrect after check",
-        expectedNumberOfAppsInMemory, appMonitor.getCompletedAppsListSize());
-    verify(rmContext.getStateStore(), times(effectiveNumRemoveApps))
-        .removeApplication(isA(RMApp.class));
-    Assert.assertEquals(expectedNumberOfAppsInMemory,
-        appMonitor.getNumberOfCompletedAppsInStateStore());
-
-    List<ApplicationId> completedApps = appMonitor.getCompletedApps();
-
-    Assert.assertEquals(expectedNumberOfAppsInMemory, completedApps.size());
-    Assert.assertEquals(effectiveNumRemoveApps, appsShouldBeRemoved.size());
-    assertTrue(Collections.disjoint(completedApps, appsShouldBeRemoved));
   }
 
   protected void setupDispatcher(RMContext rmContext, Configuration conf) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/applicationsmanager/MockAsm.java

@@ -146,17 +146,6 @@ public abstract class MockAsm extends MockApps {
     public int getMaxAppAttempts() {
       throw new UnsupportedOperationException("Not supported yet.");
     }
-
-    @Override
-    public boolean isLogAggregationEnabled() {
-      throw new UnsupportedOperationException("Not supported yet.");
-    }
-
-    @Override
-    public boolean isLogAggregationFinished() {
-      throw new UnsupportedOperationException("Not supported yet.");
-    }
-
     @Override
     public ApplicationReport createAndGetApplicationReport(
         String clientUserName,boolean allowAccess) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/MockRMApp.java

@@ -70,8 +70,6 @@ public class MockRMApp implements RMApp {
   int maxAppAttempts = 1;
   List<ResourceRequest> amReqs;
   private Set<String> applicationTags = null;
-  private boolean logAggregationEnabled;
-  private boolean logAggregationFinished;
 
   public MockRMApp(int newid, long time, RMAppState newState) {
     finish = time;
@@ -238,24 +236,6 @@ public class MockRMApp implements RMApp {
     return maxAppAttempts;
   }
 
-  @Override
-  public boolean isLogAggregationEnabled() {
-    return logAggregationEnabled;
-  }
-
-  @Override
-  public boolean isLogAggregationFinished() {
-    return logAggregationFinished;
-  }
-
-  public void setLogAggregationEnabled(boolean enabled) {
-    this.logAggregationEnabled = enabled;
-  }
-
-  public void setLogAggregationFinished(boolean finished) {
-    this.logAggregationFinished = finished;
-  }
-
   public void setNumMaxRetries(int maxAppAttempts) {
     this.maxAppAttempts = maxAppAttempts;
   }