YARN-1339. Recover DeletionService state upon nodemanager restart. (Contributed by Jason Lowe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1603036 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/CHANGES.txt

@@ -39,6 +39,9 @@ Release 2.5.0 - UNRELEASED
     YARN-1702. Added kill app functionality to RM web services. (Varun Vasudev
     via vinodkv)
 
+    YARN-1339. Recover DeletionService state upon nodemanager restart. (Jason Lowe
+    via junping_du)
+
   IMPROVEMENTS
 
     YARN-1479. Invalid NaN values in Hadoop REST API JSON response (Chen He via

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DeletionService.java

@@ -21,10 +21,13 @@ package org.apache.hadoop.yarn.server.nodemanager;
 import static java.util.concurrent.TimeUnit.SECONDS;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.concurrent.ThreadFactory;
@@ -40,6 +43,10 @@ import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.UnsupportedFileSystemException;
 import org.apache.hadoop.service.AbstractService;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.DeletionServiceDeleteTaskProto;
+import org.apache.hadoop.yarn.server.nodemanager.recovery.NMNullStateStoreService;
+import org.apache.hadoop.yarn.server.nodemanager.recovery.NMStateStoreService;
+import org.apache.hadoop.yarn.server.nodemanager.recovery.NMStateStoreService.RecoveredDeletionServiceState;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
@@ -50,6 +57,8 @@ public class DeletionService extends AbstractService {
   private final ContainerExecutor exec;
   private ScheduledThreadPoolExecutor sched;
   private static final FileContext lfs = getLfs();
+  private final NMStateStoreService stateStore;
+  private AtomicInteger nextTaskId = new AtomicInteger(0);
 
   static final FileContext getLfs() {
     try {
@@ -60,13 +69,17 @@ public class DeletionService extends AbstractService {
   }
 
   public DeletionService(ContainerExecutor exec) {
+    this(exec, new NMNullStateStoreService());
+  }
+
+  public DeletionService(ContainerExecutor exec,
+      NMStateStoreService stateStore) {
     super(DeletionService.class.getName());
     this.exec = exec;
     this.debugDelay = 0;
+    this.stateStore = stateStore;
   }
   
-  /**
-   * 
   /**
    * Delete the path(s) as this user.
    * @param user The user to delete as, or the JVM user if null
@@ -76,19 +89,20 @@ public class DeletionService extends AbstractService {
   public void delete(String user, Path subDir, Path... baseDirs) {
     // TODO if parent owned by NM, rename within parent inline
     if (debugDelay != -1) {
-      if (baseDirs == null || baseDirs.length == 0) {
+      List<Path> baseDirList = null;
-        sched.schedule(new FileDeletionTask(this, user, subDir, null),
+      if (baseDirs != null && baseDirs.length != 0) {
-          debugDelay, TimeUnit.SECONDS);
+        baseDirList = Arrays.asList(baseDirs);
-      } else {
-        sched.schedule(
-          new FileDeletionTask(this, user, subDir, Arrays.asList(baseDirs)),
-          debugDelay, TimeUnit.SECONDS);
       }
+      FileDeletionTask task =
+          new FileDeletionTask(this, user, subDir, baseDirList);
+      recordDeletionTaskInStateStore(task);
+      sched.schedule(task, debugDelay, TimeUnit.SECONDS);
     }
   }
   
   public void scheduleFileDeletionTask(FileDeletionTask fileDeletionTask) {
     if (debugDelay != -1) {
+      recordDeletionTaskInStateStore(fileDeletionTask);
       sched.schedule(fileDeletionTask, debugDelay, TimeUnit.SECONDS);
     }
   }
@@ -109,6 +123,9 @@ public class DeletionService extends AbstractService {
     }
     sched.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
     sched.setKeepAliveTime(60L, SECONDS);
+    if (stateStore.canRecover()) {
+      recover(stateStore.loadDeletionServiceState());
+    }
     super.serviceInit(conf);
   }
 
@@ -139,6 +156,8 @@ public class DeletionService extends AbstractService {
   }
 
   public static class FileDeletionTask implements Runnable {
+    public static final int INVALID_TASK_ID = -1;
+    private int taskId;
     private final String user;
     private final Path subDir;
     private final List<Path> baseDirs;
@@ -152,6 +171,12 @@ public class DeletionService extends AbstractService {
     
     private FileDeletionTask(DeletionService delService, String user,
         Path subDir, List<Path> baseDirs) {
+      this(INVALID_TASK_ID, delService, user, subDir, baseDirs);
+    }
+
+    private FileDeletionTask(int taskId, DeletionService delService,
+        String user, Path subDir, List<Path> baseDirs) {
+      this.taskId = taskId;
       this.delService = delService;
       this.user = user;
       this.subDir = subDir;
@@ -198,6 +223,12 @@ public class DeletionService extends AbstractService {
       return this.success;
     }
     
+    public synchronized FileDeletionTask[] getSuccessorTasks() {
+      FileDeletionTask[] successors =
+          new FileDeletionTask[successorTaskSet.size()];
+      return successorTaskSet.toArray(successors);
+    }
+
     @Override
     public void run() {
       if (LOG.isDebugEnabled()) {
@@ -286,6 +317,12 @@ public class DeletionService extends AbstractService {
      * dependent tasks of it has failed marking its success = false.  
      */
     private synchronized void fileDeletionTaskFinished() {
+      try {
+        delService.stateStore.removeDeletionTask(taskId);
+      } catch (IOException e) {
+        LOG.error("Unable to remove deletion task " + taskId
+            + " from state store", e);
+      }
       Iterator<FileDeletionTask> successorTaskI =
           this.successorTaskSet.iterator();
       while (successorTaskI.hasNext()) {
@@ -318,4 +355,129 @@ public class DeletionService extends AbstractService {
       Path[] baseDirs) {
     return new FileDeletionTask(this, user, subDir, Arrays.asList(baseDirs));
   }
+
+  private void recover(RecoveredDeletionServiceState state)
+      throws IOException {
+    List<DeletionServiceDeleteTaskProto> taskProtos = state.getTasks();
+    Map<Integer, DeletionTaskRecoveryInfo> idToInfoMap =
+        new HashMap<Integer, DeletionTaskRecoveryInfo>(taskProtos.size());
+    Set<Integer> successorTasks = new HashSet<Integer>();
+    for (DeletionServiceDeleteTaskProto proto : taskProtos) {
+      DeletionTaskRecoveryInfo info = parseTaskProto(proto);
+      idToInfoMap.put(info.task.taskId, info);
+      nextTaskId.set(Math.max(nextTaskId.get(), info.task.taskId));
+      successorTasks.addAll(info.successorTaskIds);
+    }
+
+    // restore the task dependencies and schedule the deletion tasks that
+    // have no predecessors
+    final long now = System.currentTimeMillis();
+    for (DeletionTaskRecoveryInfo info : idToInfoMap.values()) {
+      for (Integer successorId : info.successorTaskIds){
+        DeletionTaskRecoveryInfo successor = idToInfoMap.get(successorId);
+        if (successor != null) {
+          info.task.addFileDeletionTaskDependency(successor.task);
+        } else {
+          LOG.error("Unable to locate dependency task for deletion task "
+              + info.task.taskId + " at " + info.task.getSubDir());
+        }
+      }
+      if (!successorTasks.contains(info.task.taskId)) {
+        long msecTilDeletion = info.deletionTimestamp - now;
+        sched.schedule(info.task, msecTilDeletion, TimeUnit.MILLISECONDS);
+      }
+    }
+  }
+
+  private DeletionTaskRecoveryInfo parseTaskProto(
+      DeletionServiceDeleteTaskProto proto) throws IOException {
+    int taskId = proto.getId();
+    String user = proto.hasUser() ? proto.getUser() : null;
+    Path subdir = null;
+    List<Path> basePaths = null;
+    if (proto.hasSubdir()) {
+      subdir = new Path(proto.getSubdir());
+    }
+    List<String> basedirs = proto.getBasedirsList();
+    if (basedirs != null && basedirs.size() > 0) {
+      basePaths = new ArrayList<Path>(basedirs.size());
+      for (String basedir : basedirs) {
+        basePaths.add(new Path(basedir));
+      }
+    }
+
+    FileDeletionTask task = new FileDeletionTask(taskId, this, user,
+        subdir, basePaths);
+    return new DeletionTaskRecoveryInfo(task,
+        proto.getSuccessorIdsList(),
+        proto.getDeletionTime());
+  }
+
+  private int generateTaskId() {
+    // get the next ID but avoid an invalid ID
+    int taskId = nextTaskId.incrementAndGet();
+    while (taskId == FileDeletionTask.INVALID_TASK_ID) {
+      taskId = nextTaskId.incrementAndGet();
+    }
+    return taskId;
+  }
+
+  private void recordDeletionTaskInStateStore(FileDeletionTask task) {
+    if (!stateStore.canRecover()) {
+      // optimize the case where we aren't really recording
+      return;
+    }
+    if (task.taskId != FileDeletionTask.INVALID_TASK_ID) {
+      return;  // task already recorded
+    }
+
+    task.taskId = generateTaskId();
+
+    FileDeletionTask[] successors = task.getSuccessorTasks();
+
+    // store successors first to ensure task IDs have been generated for them
+    for (FileDeletionTask successor : successors) {
+      recordDeletionTaskInStateStore(successor);
+    }
+
+    DeletionServiceDeleteTaskProto.Builder builder =
+        DeletionServiceDeleteTaskProto.newBuilder();
+    builder.setId(task.taskId);
+    if (task.getUser() != null) {
+      builder.setUser(task.getUser());
+    }
+    if (task.getSubDir() != null) {
+      builder.setSubdir(task.getSubDir().toString());
+    }
+    builder.setDeletionTime(System.currentTimeMillis() +
+        TimeUnit.MILLISECONDS.convert(debugDelay, TimeUnit.SECONDS));
+    if (task.getBaseDirs() != null) {
+      for (Path dir : task.getBaseDirs()) {
+        builder.addBasedirs(dir.toString());
+      }
+    }
+    for (FileDeletionTask successor : successors) {
+      builder.addSuccessorIds(successor.taskId);
+    }
+
+    try {
+      stateStore.storeDeletionTask(task.taskId, builder.build());
+    } catch (IOException e) {
+      LOG.error("Unable to store deletion task " + task.taskId + " for "
+          + task.getSubDir(), e);
+    }
+  }
+
+  private static class DeletionTaskRecoveryInfo {
+    FileDeletionTask task;
+    List<Integer> successorTaskIds;
+    long deletionTimestamp;
+
+    public DeletionTaskRecoveryInfo(FileDeletionTask task,
+        List<Integer> successorTaskIds, long deletionTimestamp) {
+      this.task = task;
+      this.successorTaskIds = successorTaskIds;
+      this.deletionTimestamp = deletionTimestamp;
+    }
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/NodeManager.java

@@ -114,7 +114,7 @@ public class NodeManager extends CompositeService
   }
 
   protected DeletionService createDeletionService(ContainerExecutor exec) {
-    return new DeletionService(exec);
+    return new DeletionService(exec, nmStore);
   }
 
   protected NMContext createNMContext(

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/recovery/NMLeveldbStateStoreService.java

@@ -38,6 +38,7 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.proto.YarnProtos.LocalResourceProto;
+import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.DeletionServiceDeleteTaskProto;
 import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.LocalizedResourceProto;
 import org.apache.hadoop.yarn.server.utils.LeveldbIterator;
 import org.apache.hadoop.yarn.util.ConverterUtils;
@@ -58,6 +59,9 @@ public class NMLeveldbStateStoreService extends NMStateStoreService {
   private static final String DB_SCHEMA_VERSION_KEY = "schema-version";
   private static final String DB_SCHEMA_VERSION = "1.0";
 
+  private static final String DELETION_TASK_KEY_PREFIX =
+      "DeletionService/deltask_";
+
   private static final String LOCALIZATION_KEY_PREFIX = "Localization/";
   private static final String LOCALIZATION_PUBLIC_KEY_PREFIX =
       LOCALIZATION_KEY_PREFIX + "public/";
@@ -308,6 +312,56 @@ public class NMLeveldbStateStoreService extends NMStateStoreService {
   }
 
 
+  @Override
+  public RecoveredDeletionServiceState loadDeletionServiceState()
+      throws IOException {
+    RecoveredDeletionServiceState state = new RecoveredDeletionServiceState();
+    state.tasks = new ArrayList<DeletionServiceDeleteTaskProto>();
+    LeveldbIterator iter = null;
+    try {
+      iter = new LeveldbIterator(db);
+      iter.seek(bytes(DELETION_TASK_KEY_PREFIX));
+      while (iter.hasNext()) {
+        Entry<byte[], byte[]> entry = iter.next();
+        String key = asString(entry.getKey());
+        if (!key.startsWith(DELETION_TASK_KEY_PREFIX)) {
+          break;
+        }
+        state.tasks.add(
+            DeletionServiceDeleteTaskProto.parseFrom(entry.getValue()));
+      }
+    } catch (DBException e) {
+      throw new IOException(e.getMessage(), e);
+    } finally {
+      if (iter != null) {
+        iter.close();
+      }
+    }
+    return state;
+  }
+
+  @Override
+  public void storeDeletionTask(int taskId,
+      DeletionServiceDeleteTaskProto taskProto) throws IOException {
+    String key = DELETION_TASK_KEY_PREFIX + taskId;
+    try {
+      db.put(bytes(key), taskProto.toByteArray());
+    } catch (DBException e) {
+      throw new IOException(e.getMessage(), e);
+    }
+  }
+
+  @Override
+  public void removeDeletionTask(int taskId) throws IOException {
+    String key = DELETION_TASK_KEY_PREFIX + taskId;
+    try {
+      db.delete(bytes(key));
+    } catch (DBException e) {
+      throw new IOException(e.getMessage(), e);
+    }
+  }
+
+
   @Override
   protected void initStorage(Configuration conf)
       throws IOException {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/recovery/NMNullStateStoreService.java

@@ -24,6 +24,7 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.proto.YarnProtos.LocalResourceProto;
+import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.DeletionServiceDeleteTaskProto;
 import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.LocalizedResourceProto;
 
 // The state store to use when state isn't being stored
@@ -60,6 +61,22 @@ public class NMNullStateStoreService extends NMStateStoreService {
       Path localPath) throws IOException {
   }
 
+  @Override
+  public RecoveredDeletionServiceState loadDeletionServiceState()
+      throws IOException {
+    throw new UnsupportedOperationException(
+        "Recovery not supported by this state store");
+  }
+
+  @Override
+  public void storeDeletionTask(int taskId,
+      DeletionServiceDeleteTaskProto taskProto) throws IOException {
+  }
+
+  @Override
+  public void removeDeletionTask(int taskId) throws IOException {
+  }
+
   @Override
   protected void initStorage(Configuration conf) throws IOException {
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/recovery/NMStateStoreService.java

@@ -31,6 +31,7 @@ import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.service.AbstractService;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.proto.YarnProtos.LocalResourceProto;
+import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.DeletionServiceDeleteTaskProto;
 import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.LocalizedResourceProto;
 
 @Private
@@ -91,6 +92,14 @@ public abstract class NMStateStoreService extends AbstractService {
     }
   }
 
+  public static class RecoveredDeletionServiceState {
+    List<DeletionServiceDeleteTaskProto> tasks;
+
+    public List<DeletionServiceDeleteTaskProto> getTasks() {
+      return tasks;
+    }
+  }
+
   /** Initialize the state storage */
   @Override
   public void serviceInit(Configuration conf) throws IOException {
@@ -155,6 +164,15 @@ public abstract class NMStateStoreService extends AbstractService {
       ApplicationId appId, Path localPath) throws IOException;
 
 
+  public abstract RecoveredDeletionServiceState loadDeletionServiceState()
+      throws IOException;
+
+  public abstract void storeDeletionTask(int taskId,
+      DeletionServiceDeleteTaskProto taskProto) throws IOException;
+
+  public abstract void removeDeletionTask(int taskId) throws IOException;
+
+
   protected abstract void initStorage(Configuration conf) throws IOException;
 
   protected abstract void startStorage() throws IOException;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/proto/yarn_server_nodemanager_recovery.proto

@@ -24,6 +24,15 @@ package hadoop.yarn;
 
 import "yarn_protos.proto";
 
+message DeletionServiceDeleteTaskProto {
+  optional int32 id = 1;
+  optional string user = 2;
+  optional string subdir = 3;
+  optional int64 deletionTime = 4;
+  repeated string basedirs = 5;
+  repeated int32 successorIds = 6;
+}
+
 message LocalizedResourceProto {
   optional LocalResourceProto resource = 1;
   optional string localPath = 2;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/TestDeletionService.java

@@ -34,6 +34,7 @@ import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.UnsupportedFileSystemException;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.server.nodemanager.DeletionService.FileDeletionTask;
+import org.apache.hadoop.yarn.server.nodemanager.recovery.NMMemoryStateStoreService;
 import org.junit.AfterClass;
 import org.junit.Test;
 import org.mockito.Mockito;
@@ -285,4 +286,58 @@ public class TestDeletionService {
       del.stop();
     }
   }
+
+  @Test
+  public void testRecovery() throws Exception {
+    Random r = new Random();
+    long seed = r.nextLong();
+    r.setSeed(seed);
+    System.out.println("SEED: " + seed);
+    List<Path> baseDirs = buildDirs(r, base, 4);
+    createDirs(new Path("."), baseDirs);
+    List<Path> content = buildDirs(r, new Path("."), 10);
+    for (Path b : baseDirs) {
+      createDirs(b, content);
+    }
+    Configuration conf = new YarnConfiguration();
+    conf.setBoolean(YarnConfiguration.NM_RECOVERY_ENABLED, true);
+    conf.setInt(YarnConfiguration.DEBUG_NM_DELETE_DELAY_SEC, 1);
+    NMMemoryStateStoreService stateStore = new NMMemoryStateStoreService();
+    stateStore.init(conf);
+    stateStore.start();
+    DeletionService del =
+      new DeletionService(new FakeDefaultContainerExecutor(), stateStore);
+    try {
+      del.init(conf);
+      del.start();
+      for (Path p : content) {
+        assertTrue(lfs.util().exists(new Path(baseDirs.get(0), p)));
+        del.delete((Long.parseLong(p.getName()) % 2) == 0 ? null : "dingo",
+            p, baseDirs.toArray(new Path[4]));
+      }
+
+      // restart the deletion service
+      del.stop();
+      del = new DeletionService(new FakeDefaultContainerExecutor(),
+          stateStore);
+      del.init(conf);
+      del.start();
+
+      // verify paths are still eventually deleted
+      int msecToWait = 10 * 1000;
+      for (Path p : baseDirs) {
+        for (Path q : content) {
+          Path fp = new Path(p, q);
+          while (msecToWait > 0 && lfs.util().exists(fp)) {
+            Thread.sleep(100);
+            msecToWait -= 100;
+          }
+          assertFalse(lfs.util().exists(fp));
+        }
+      }
+    } finally {
+      del.close();
+      stateStore.close();
+    }
+  }
 }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/recovery/NMMemoryStateStoreService.java

@@ -18,6 +18,8 @@
 
 package org.apache.hadoop.yarn.server.nodemanager.recovery;
 
+import java.io.IOException;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -25,10 +27,12 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.proto.YarnProtos.LocalResourceProto;
+import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.DeletionServiceDeleteTaskProto;
 import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.LocalizedResourceProto;
 
 public class NMMemoryStateStoreService extends NMStateStoreService {
   private Map<TrackerKey, TrackerState> trackerStates;
+  private Map<Integer, DeletionServiceDeleteTaskProto> deleteTasks;
 
   public NMMemoryStateStoreService() {
     super(NMMemoryStateStoreService.class.getName());
@@ -110,6 +114,7 @@ public class NMMemoryStateStoreService extends NMStateStoreService {
   @Override
   protected void initStorage(Configuration conf) {
     trackerStates = new HashMap<TrackerKey, TrackerState>();
+    deleteTasks = new HashMap<Integer, DeletionServiceDeleteTaskProto>();
   }
 
   @Override
@@ -121,6 +126,28 @@ public class NMMemoryStateStoreService extends NMStateStoreService {
   }
 
 
+  @Override
+  public RecoveredDeletionServiceState loadDeletionServiceState()
+      throws IOException {
+    RecoveredDeletionServiceState result =
+        new RecoveredDeletionServiceState();
+    result.tasks = new ArrayList<DeletionServiceDeleteTaskProto>(
+        deleteTasks.values());
+    return result;
+  }
+
+  @Override
+  public synchronized void storeDeletionTask(int taskId,
+      DeletionServiceDeleteTaskProto taskProto) throws IOException {
+    deleteTasks.put(taskId, taskProto);
+  }
+
+  @Override
+  public synchronized void removeDeletionTask(int taskId) throws IOException {
+    deleteTasks.remove(taskId);
+  }
+
+
   private static class TrackerState {
     Map<Path, LocalResourceProto> inProgressMap =
         new HashMap<Path, LocalResourceProto>();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/recovery/TestNMLeveldbStateStoreService.java

@@ -35,8 +35,10 @@ import org.apache.hadoop.yarn.api.records.LocalResourceVisibility;
 import org.apache.hadoop.yarn.api.records.impl.pb.LocalResourcePBImpl;
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.proto.YarnProtos.LocalResourceProto;
+import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.DeletionServiceDeleteTaskProto;
 import org.apache.hadoop.yarn.proto.YarnServerNodemanagerRecoveryProtos.LocalizedResourceProto;
 import org.apache.hadoop.yarn.server.nodemanager.recovery.NMStateStoreService.LocalResourceTrackerState;
+import org.apache.hadoop.yarn.server.nodemanager.recovery.NMStateStoreService.RecoveredDeletionServiceState;
 import org.apache.hadoop.yarn.server.nodemanager.recovery.NMStateStoreService.RecoveredLocalizationState;
 import org.apache.hadoop.yarn.server.nodemanager.recovery.NMStateStoreService.RecoveredUserResources;
 import org.apache.hadoop.yarn.util.ConverterUtils;
@@ -404,4 +406,58 @@ public class TestNMLeveldbStateStoreService {
         state.getUserResources();
     assertTrue(userResources.isEmpty());
   }
+
+  @Test
+  public void testDeletionTaskStorage() throws IOException {
+    // test empty when no state
+    RecoveredDeletionServiceState state =
+        stateStore.loadDeletionServiceState();
+    assertTrue(state.getTasks().isEmpty());
+
+    // store a deletion task and verify recovered
+    DeletionServiceDeleteTaskProto proto =
+        DeletionServiceDeleteTaskProto.newBuilder()
+        .setId(7)
+        .setUser("someuser")
+        .setSubdir("some/subdir")
+        .addBasedirs("some/dir/path")
+        .addBasedirs("some/other/dir/path")
+        .setDeletionTime(123456L)
+        .addSuccessorIds(8)
+        .addSuccessorIds(9)
+        .build();
+    stateStore.storeDeletionTask(proto.getId(), proto);
+    restartStateStore();
+    state = stateStore.loadDeletionServiceState();
+    assertEquals(1, state.getTasks().size());
+    assertEquals(proto, state.getTasks().get(0));
+
+    // store another deletion task
+    DeletionServiceDeleteTaskProto proto2 =
+        DeletionServiceDeleteTaskProto.newBuilder()
+        .setId(8)
+        .setUser("user2")
+        .setSubdir("subdir2")
+        .setDeletionTime(789L)
+        .build();
+    stateStore.storeDeletionTask(proto2.getId(), proto2);
+    restartStateStore();
+    state = stateStore.loadDeletionServiceState();
+    assertEquals(2, state.getTasks().size());
+    assertTrue(state.getTasks().contains(proto));
+    assertTrue(state.getTasks().contains(proto2));
+
+    // delete a task and verify gone after recovery
+    stateStore.removeDeletionTask(proto2.getId());
+    restartStateStore();
+    state = stateStore.loadDeletionServiceState();
+    assertEquals(1, state.getTasks().size());
+    assertEquals(proto, state.getTasks().get(0));
+
+    // delete the last task and verify none left
+    stateStore.removeDeletionTask(proto.getId());
+    restartStateStore();
+    state = stateStore.loadDeletionServiceState();
+    assertTrue(state.getTasks().isEmpty());
+  }
 }