HDDS-288. Fix bugs in OpenContainerBlockMap. Contributed by Tsz Wo Nicholas Sze.

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/OpenContainerBlockMap.java

@@ -21,22 +21,52 @@ package org.apache.hadoop.ozone.container.common.impl;
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
 import org.apache.hadoop.hdds.client.BlockID;
-import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos;
+import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos.ChunkInfo;
 import org.apache.hadoop.ozone.container.common.helpers.KeyData;
 
-import java.io.IOException;
-import java.util.HashMap;
-import java.util.LinkedHashMap;
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
+import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.stream.Collectors;
+import java.util.concurrent.ConcurrentMap;
+import java.util.function.Function;
 
 /**
+ * Map: containerId -> (localId -> KeyData).
+ * The outer container map does not entail locking for a better performance.
+ * The inner {@link KeyDataMap} is synchronized.
+ *
  * This class will maintain list of open keys per container when closeContainer
  * command comes, it should autocommit all open keys of a open container before
  * marking the container as closed.
  */
 public class OpenContainerBlockMap {
+  /**
+   * Map: localId -> KeyData.
+   *
+   * In order to support {@link #getAll()}, the update operations are synchronized.
+   */
+  static class KeyDataMap {
+    private final ConcurrentMap<Long, KeyData> blocks = new ConcurrentHashMap<>();
+
+    KeyData get(long localId) {
+      return blocks.get(localId);
+    }
+
+    synchronized int removeAndGetSize(long localId) {
+      blocks.remove(localId);
+      return blocks.size();
+    }
+
+    synchronized KeyData computeIfAbsent(long localId, Function<Long, KeyData> f) {
+      return blocks.computeIfAbsent(localId, f);
+    }
+
+    synchronized List<KeyData> getAll() {
+      return new ArrayList<>(blocks.values());
+    }
+  }
 
   /**
    * TODO : We may construct the openBlockMap by reading the Block Layout
@@ -46,15 +76,8 @@ public class OpenContainerBlockMap {
    *
    * For now, we will track all open blocks of a container in the blockMap.
    */
-  private final ConcurrentHashMap<Long, HashMap<Long, KeyData>>
-      openContainerBlockMap;
+  private final ConcurrentMap<Long, KeyDataMap> containers = new ConcurrentHashMap<>();
 
-  /**
-   * Constructs OpenContainerBlockMap.
-   */
-  public OpenContainerBlockMap() {
-     openContainerBlockMap = new ConcurrentHashMap<>();
-  }
   /**
    * Removes the Container matching with specified containerId.
    * @param containerId containerId
@@ -62,73 +85,27 @@ public class OpenContainerBlockMap {
   public void removeContainer(long containerId) {
     Preconditions
         .checkState(containerId >= 0, "Container Id cannot be negative.");
-    openContainerBlockMap.computeIfPresent(containerId, (k, v) -> null);
-  }
-
-  /**
-   * updates the chunkInfoList in case chunk is added or deleted
-   * @param blockID id of the block.
-   * @param info - Chunk Info
-   * @param remove if true, deletes the chunkInfo list otherwise appends to the
-   *               chunkInfo List
-   * @throws IOException
-   */
-  public synchronized void updateOpenKeyMap(BlockID blockID,
-      ContainerProtos.ChunkInfo info, boolean remove) throws IOException {
-    if (remove) {
-      deleteChunkFromMap(blockID, info);
-    } else {
-      addChunkToMap(blockID, info);
-    }
+    containers.remove(containerId);
   }
 
-  private KeyData getKeyData(ContainerProtos.ChunkInfo info, BlockID blockID)
-      throws IOException {
-    KeyData keyData = new KeyData(blockID);
-    keyData.addMetadata("TYPE", "KEY");
-    keyData.addChunk(info);
-    return keyData;
-  }
-
-  private void addChunkToMap(BlockID blockID, ContainerProtos.ChunkInfo info)
-      throws IOException {
+  public void addChunk(BlockID blockID, ChunkInfo info) {
     Preconditions.checkNotNull(info);
-    long containerId = blockID.getContainerID();
-    long localID = blockID.getLocalID();
-
-    KeyData keyData = openContainerBlockMap.computeIfAbsent(containerId,
-        emptyMap -> new LinkedHashMap<Long, KeyData>())
-        .putIfAbsent(localID, getKeyData(info, blockID));
-    // KeyData != null means the block already exist
-    if (keyData != null) {
-      HashMap<Long, KeyData> keyDataSet =
-          openContainerBlockMap.get(containerId);
-      keyDataSet.putIfAbsent(blockID.getLocalID(), getKeyData(info, blockID));
-      keyDataSet.computeIfPresent(blockID.getLocalID(), (key, value) -> {
-        value.addChunk(info);
-        return value;
-      });
-    }
+    containers.computeIfAbsent(blockID.getContainerID(), id -> new KeyDataMap())
+        .computeIfAbsent(blockID.getLocalID(), id -> new KeyData(blockID))
+        .addChunk(info);
   }
 
   /**
-   * removes the chunks from the chunkInfo list for the given block.
+   * Removes the chunk from the chunkInfo list for the given block.
    * @param blockID id of the block
    * @param chunkInfo chunk info.
    */
-  private synchronized void deleteChunkFromMap(BlockID blockID,
-      ContainerProtos.ChunkInfo chunkInfo) {
+  public void removeChunk(BlockID blockID, ChunkInfo chunkInfo) {
     Preconditions.checkNotNull(chunkInfo);
     Preconditions.checkNotNull(blockID);
-    HashMap<Long, KeyData> keyDataMap =
-        openContainerBlockMap.get(blockID.getContainerID());
-    if (keyDataMap != null) {
-      long localId = blockID.getLocalID();
-      KeyData keyData = keyDataMap.get(localId);
-      if (keyData != null) {
-        keyData.removeChunk(chunkInfo);
-      }
-    }
+    Optional.ofNullable(containers.get(blockID.getContainerID()))
+        .map(blocks -> blocks.get(blockID.getLocalID()))
+        .ifPresent(keyData -> keyData.removeChunk(chunkInfo));
   }
 
   /**
@@ -137,31 +114,23 @@ public class OpenContainerBlockMap {
    * @return List of open Keys(blocks)
    */
   public List<KeyData> getOpenKeys(long containerId) {
-    HashMap<Long, KeyData> keyDataHashMap =
-        openContainerBlockMap.get(containerId);
-    return keyDataHashMap == null ? null :
-        keyDataHashMap.values().stream().collect(Collectors.toList());
+    return Optional.ofNullable(containers.get(containerId))
+        .map(KeyDataMap::getAll)
+        .orElseGet(Collections::emptyList);
   }
 
   /**
    * removes the block from the block map.
    * @param blockID
    */
-  public synchronized void removeFromKeyMap(BlockID blockID) {
+  public void removeFromKeyMap(BlockID blockID) {
     Preconditions.checkNotNull(blockID);
-    HashMap<Long, KeyData> keyDataMap =
-        openContainerBlockMap.get(blockID.getContainerID());
-    if (keyDataMap != null) {
-      keyDataMap.remove(blockID.getLocalID());
-      if (keyDataMap.size() == 0) {
-        removeContainer(blockID.getContainerID());
-      }
-    }
+    containers.computeIfPresent(blockID.getContainerID(), (containerId, blocks)
+        -> blocks.removeAndGetSize(blockID.getLocalID()) == 0? null: blocks);
   }
 
   @VisibleForTesting
-  public ConcurrentHashMap<Long,
-      HashMap<Long, KeyData>> getContainerOpenKeyMap() {
-    return openContainerBlockMap;
+  KeyDataMap getKeyDataMap(long containerId) {
+    return containers.get(containerId);
   }
 }

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/keyvalue/KeyValueHandler.java

@@ -435,10 +435,8 @@ public class KeyValueHandler extends Handler {
     long containerId = kvContainer.getContainerData().getContainerID();
     List<KeyData> pendingKeys =
         this.openContainerBlockMap.getOpenKeys(containerId);
-    if (pendingKeys != null) {
-      for (KeyData keyData : pendingKeys) {
-        commitKey(keyData, kvContainer);
-      }
+    for(KeyData keyData : pendingKeys) {
+      commitKey(keyData, kvContainer);
     }
   }
 
@@ -598,7 +596,7 @@ public class KeyValueHandler extends Handler {
       Preconditions.checkNotNull(chunkInfo);
 
       chunkManager.deleteChunk(kvContainer, blockID, chunkInfo);
-      openContainerBlockMap.updateOpenKeyMap(blockID, chunkInfoProto, true);
+      openContainerBlockMap.removeChunk(blockID, chunkInfoProto);
     } catch (StorageContainerException ex) {
       return ContainerUtils.logAndReturnError(LOG, ex, request);
     } catch (IOException ex) {
@@ -648,7 +646,7 @@ public class KeyValueHandler extends Handler {
             .getChunkData().getLen());
         // the openContainerBlockMap should be updated only while writing data
         // not during COMMIT_STAGE of handling write chunk request.
-        openContainerBlockMap.updateOpenKeyMap(blockID, chunkInfoProto, false);
+        openContainerBlockMap.addChunk(blockID, chunkInfoProto);
       }
     } catch (StorageContainerException ex) {
       return ContainerUtils.logAndReturnError(LOG, ex, request);

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/container/common/impl/TestCloseContainerHandler.java

@@ -162,9 +162,9 @@ public class TestCloseContainerHandler {
     Pipeline pipeline = createSingleNodePipeline();
     List<ChunkInfo> chunkList = writeChunkBuilder(blockID, pipeline, 3);
     // the key should exist in the map
-    Assert.assertTrue(
-        openContainerBlockMap.getContainerOpenKeyMap().get(testContainerID)
-            .containsKey(blockID.getLocalID()));
+    Assert.assertNotNull(
+        openContainerBlockMap.getKeyDataMap(testContainerID)
+            .get(blockID.getLocalID()));
     KeyData keyData = new KeyData(blockID);
     List<ContainerProtos.ChunkInfo> chunkProtoList = new LinkedList<>();
     for (ChunkInfo i : chunkList) {
@@ -184,7 +184,7 @@ public class TestCloseContainerHandler {
 
     //the open key should be removed from Map
     Assert.assertNull(
-        openContainerBlockMap.getContainerOpenKeyMap().get(testContainerID));
+        openContainerBlockMap.getKeyDataMap(testContainerID));
   }
 
   @Test
@@ -196,11 +196,11 @@ public class TestCloseContainerHandler {
     Pipeline pipeline = createSingleNodePipeline();
     List<ChunkInfo> chunkList = writeChunkBuilder(blockID, pipeline, 3);
     // the key should exist in the map
+    Assert.assertNotNull(
+        openContainerBlockMap.getKeyDataMap(testContainerID)
+            .get(blockID.getLocalID()));
     Assert.assertTrue(
-        openContainerBlockMap.getContainerOpenKeyMap().get(testContainerID)
-            .containsKey(blockID.getLocalID()));
-    Assert.assertTrue(
-        openContainerBlockMap.getContainerOpenKeyMap().get(testContainerID)
+        openContainerBlockMap.getKeyDataMap(testContainerID)
             .get(blockID.getLocalID()).getChunks().size() == 3);
     ContainerProtos.DeleteChunkRequestProto.Builder deleteChunkProto =
         ContainerProtos.DeleteChunkRequestProto.newBuilder();
@@ -219,7 +219,7 @@ public class TestCloseContainerHandler {
     request.setDatanodeUuid(pipeline.getLeader().getUuidString());
     dispatcher.dispatch(request.build());
     Assert.assertTrue(
-        openContainerBlockMap.getContainerOpenKeyMap().get(testContainerID)
+        openContainerBlockMap.getKeyDataMap(testContainerID)
             .get(blockID.getLocalID()).getChunks().size() == 2);
 
   }
@@ -234,12 +234,12 @@ public class TestCloseContainerHandler {
     List<ChunkInfo> chunkList = writeChunkBuilder(blockID, pipeline, 3);
 
     Container container = containerSet.getContainer(testContainerID);
-    KeyData keyData = openContainerBlockMap.getContainerOpenKeyMap().
-        get(testContainerID).get(blockID.getLocalID());
+    KeyData keyData = openContainerBlockMap.
+        getKeyDataMap(testContainerID).get(blockID.getLocalID());
     // the key should exist in the map
-    Assert.assertTrue(
-        openContainerBlockMap.getContainerOpenKeyMap().get(testContainerID)
-            .containsKey(blockID.getLocalID()));
+    Assert.assertNotNull(
+        openContainerBlockMap.getKeyDataMap(testContainerID)
+            .get(blockID.getLocalID()));
     Assert.assertTrue(
         keyData.getChunks().size() == chunkList.size());
     ContainerProtos.CloseContainerRequestProto.Builder closeContainerProto =
@@ -253,7 +253,7 @@ public class TestCloseContainerHandler {
     request.setDatanodeUuid(pipeline.getLeader().getUuidString());
     dispatcher.dispatch(request.build());
     Assert.assertNull(
-        openContainerBlockMap.getContainerOpenKeyMap().get(testContainerID));
+        openContainerBlockMap.getKeyDataMap(testContainerID));
     // Make sure the key got committed
     Assert.assertNotNull(handler.getKeyManager().getKey(container, blockID));
   }