HDFS-5556. Add some more NameNode cache statistics, cache pool stats (cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1546143 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -218,6 +218,9 @@ Trunk (Unreleased)
     HDFS-5286. Flatten INodeDirectory hierarchy: Replace INodeDirectoryWithQuota
     with DirectoryWithQuotaFeature.  (szetszwo)
 
+    HDFS-5556. Add some more NameNode cache statistics, cache pool stats
+    (cmccabe)
+
   OPTIMIZATIONS
     HDFS-5349. DNA_CACHE and DNA_UNCACHE should be by blockId only. (cmccabe)
 

hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml

@@ -352,6 +352,11 @@
       <Method name="getReplication" />
       <Bug pattern="ICAST_QUESTIONABLE_UNSIGNED_RIGHT_SHIFT" />
     </Match>
+    <Match>
+      <Class name="org.apache.hadoop.hdfs.protocol.CacheDirective" />
+      <Method name="insertInternal" />
+      <Bug pattern="BC_UNCONFIRMED_CAST" />
+    </Match>
     <!-- These two are used for shutting down and kicking the CRMon, do not need strong sync -->
     <Match>
       <Class name="org.apache.hadoop.hdfs.server.blockmanagement.CacheReplicationMonitor" />

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java

@@ -109,6 +109,7 @@ import org.apache.hadoop.hdfs.client.ClientMmapManager;
 import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
 import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
 import org.apache.hadoop.hdfs.protocol.CorruptFileBlocks;
@@ -2358,7 +2359,7 @@ public class DFSClient implements java.io.Closeable {
     }
   }
 
-  public RemoteIterator<CachePoolInfo> listCachePools() throws IOException {
+  public RemoteIterator<CachePoolEntry> listCachePools() throws IOException {
     checkOpen();
     try {
       return namenode.listCachePools("");

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java

@@ -58,6 +58,7 @@ import org.apache.hadoop.hdfs.client.HdfsAdmin;
 import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
 import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.DirectoryListing;
@@ -1713,12 +1714,12 @@ public class DistributedFileSystem extends FileSystem {
   /**
    * List all cache pools.
    *
-   * @return A remote iterator from which you can get CachePoolInfo objects.
+   * @return A remote iterator from which you can get CachePoolEntry objects.
    *          Requests will be made as needed.
    * @throws IOException
    *          If there was an error listing cache pools.
    */
-  public RemoteIterator<CachePoolInfo> listCachePools() throws IOException {
+  public RemoteIterator<CachePoolEntry> listCachePools() throws IOException {
     return dfs.listCachePools();
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/client/HdfsAdmin.java

@@ -29,6 +29,7 @@ import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.tools.DFSAdmin;
@@ -213,12 +214,12 @@ public class HdfsAdmin {
   /**
    * List all cache pools.
    *
-   * @return A remote iterator from which you can get CachePoolInfo objects.
+   * @return A remote iterator from which you can get CachePoolEntry objects.
    *          Requests will be made as needed.
    * @throws IOException
    *          If there was an error listing cache pools.
    */
-  public RemoteIterator<CachePoolInfo> listCachePools() throws IOException {
+  public RemoteIterator<CachePoolEntry> listCachePools() throws IOException {
     return dfs.listCachePools();
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/CacheDirective.java

@@ -21,6 +21,8 @@ import org.apache.commons.lang.builder.HashCodeBuilder;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.server.namenode.CachePool;
+import org.apache.hadoop.util.IntrusiveCollection;
+import org.apache.hadoop.util.IntrusiveCollection.Element;
 
 import com.google.common.base.Preconditions;
 
@@ -30,32 +32,32 @@ import com.google.common.base.Preconditions;
  * This is an implementation class, not part of the public API.
  */
 @InterfaceAudience.Private
-public final class CacheDirective {
+public final class CacheDirective implements IntrusiveCollection.Element {
-  private final long entryId;
+  private final long id;
   private final String path;
   private final short replication;
-  private final CachePool pool;
+  private CachePool pool;
   private long bytesNeeded;
   private long bytesCached;
   private long filesAffected;
+  private Element prev;
+  private Element next;
 
-  public CacheDirective(long entryId, String path,
+  public CacheDirective(long id, String path,
-      short replication, CachePool pool) {
+      short replication) {
-    Preconditions.checkArgument(entryId > 0);
+    Preconditions.checkArgument(id > 0);
-    this.entryId = entryId;
+    this.id = id;
     Preconditions.checkArgument(replication > 0);
     this.path = path;
-    Preconditions.checkNotNull(pool);
     this.replication = replication;
     Preconditions.checkNotNull(path);
-    this.pool = pool;
     this.bytesNeeded = 0;
     this.bytesCached = 0;
     this.filesAffected = 0;
   }
 
-  public long getEntryId() {
+  public long getId() {
-    return entryId;
+    return id;
   }
 
   public String getPath() {
@@ -70,9 +72,9 @@ public final class CacheDirective {
     return replication;
   }
 
-  public CacheDirectiveInfo toDirective() {
+  public CacheDirectiveInfo toInfo() {
     return new CacheDirectiveInfo.Builder().
-        setId(entryId).
+        setId(id).
         setPath(new Path(path)).
         setReplication(replication).
         setPool(pool.getPoolName()).
@@ -88,13 +90,13 @@ public final class CacheDirective {
   }
 
   public CacheDirectiveEntry toEntry() {
-    return new CacheDirectiveEntry(toDirective(), toStats());
+    return new CacheDirectiveEntry(toInfo(), toStats());
   }
   
   @Override
   public String toString() {
     StringBuilder builder = new StringBuilder();
-    builder.append("{ entryId:").append(entryId).
+    builder.append("{ id:").append(id).
       append(", path:").append(path).
       append(", replication:").append(replication).
       append(", pool:").append(pool).
@@ -113,12 +115,12 @@ public final class CacheDirective {
       return false;
     }
     CacheDirective other = (CacheDirective)o;
-    return entryId == other.entryId;
+    return id == other.id;
   }
 
   @Override
   public int hashCode() {
-    return new HashCodeBuilder().append(entryId).toHashCode();
+    return new HashCodeBuilder().append(id).toHashCode();
   }
 
   public long getBytesNeeded() {
@@ -156,4 +158,55 @@ public final class CacheDirective {
   public void incrementFilesAffected() {
     this.filesAffected++;
   }
+
+  @SuppressWarnings("unchecked")
+  @Override // IntrusiveCollection.Element
+  public void insertInternal(IntrusiveCollection<? extends Element> list,
+      Element prev, Element next) {
+    assert this.pool == null;
+    this.pool = ((CachePool.DirectiveList)list).getCachePool();
+    this.prev = prev;
+    this.next = next;
+  }
+
+  @Override // IntrusiveCollection.Element
+  public void setPrev(IntrusiveCollection<? extends Element> list, Element prev) {
+    assert list == pool.getDirectiveList();
+    this.prev = prev;
+  }
+
+  @Override // IntrusiveCollection.Element
+  public void setNext(IntrusiveCollection<? extends Element> list, Element next) {
+    assert list == pool.getDirectiveList();
+    this.next = next;
+  }
+
+  @Override // IntrusiveCollection.Element
+  public void removeInternal(IntrusiveCollection<? extends Element> list) {
+    assert list == pool.getDirectiveList();
+    this.pool = null;
+    this.prev = null;
+    this.next = null;
+  }
+
+  @Override // IntrusiveCollection.Element
+  public Element getPrev(IntrusiveCollection<? extends Element> list) {
+    if (list != pool.getDirectiveList()) {
+      return null;
+    }
+    return this.prev;
+  }
+
+  @Override // IntrusiveCollection.Element
+  public Element getNext(IntrusiveCollection<? extends Element> list) {
+    if (list != pool.getDirectiveList()) {
+      return null;
+    }
+    return this.next;
+  }
+
+  @Override // IntrusiveCollection.Element
+  public boolean isInList(IntrusiveCollection<? extends Element> list) {
+    return pool == null ? false : list == pool.getDirectiveList();
+  }
 };

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/CacheDirectiveStats.java

@@ -94,21 +94,21 @@ public class CacheDirectiveStats {
   /**
    * @return The bytes needed.
    */
-  public Long getBytesNeeded() {
+  public long getBytesNeeded() {
     return bytesNeeded;
   }
 
   /**
    * @return The bytes cached.
    */
-  public Long getBytesCached() {
+  public long getBytesCached() {
     return bytesCached;
   }
 
   /**
    * @return The files affected.
    */
-  public Long getFilesAffected() {
+  public long getFilesAffected() {
     return filesAffected;
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/CachePoolEntry.java

@@ -0,0 +1,45 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hdfs.protocol;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+
+/**
+ * Describes a Cache Pool entry.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public class CachePoolEntry {
+  private final CachePoolInfo info;
+  private final CachePoolStats stats;
+
+  public CachePoolEntry(CachePoolInfo info, CachePoolStats stats) {
+    this.info = info;
+    this.stats = stats;
+  }
+
+  public CachePoolInfo getInfo() {
+    return info;
+  }
+
+  public CachePoolStats getStats() {
+    return stats;
+  }
+}

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/CachePoolInfo.java

@@ -30,6 +30,7 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.InvalidRequestException;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.fs.permission.PermissionStatus;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp;
@@ -150,7 +151,10 @@ public class CachePoolInfo {
 
   public static void validate(CachePoolInfo info) throws IOException {
     if (info == null) {
-      throw new IOException("CachePoolInfo is null");
+      throw new InvalidRequestException("CachePoolInfo is null");
+    }
+    if ((info.getWeight() != null) && (info.getWeight() < 0)) {
+      throw new InvalidRequestException("CachePool weight is negative.");
     }
     validateName(info.poolName);
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/CachePoolStats.java

@@ -0,0 +1,87 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hdfs.protocol;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+
+/**
+ * CachePoolStats describes cache pool statistics.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public class CachePoolStats {
+  public static class Builder {
+    private long bytesNeeded;
+    private long bytesCached;
+    private long filesAffected;
+
+    public Builder() {
+    }
+
+    public Builder setBytesNeeded(long bytesNeeded) {
+      this.bytesNeeded = bytesNeeded;
+      return this;
+    }
+
+    public Builder setBytesCached(long bytesCached) {
+      this.bytesCached = bytesCached;
+      return this;
+    }
+
+    public Builder setFilesAffected(long filesAffected) {
+      this.filesAffected = filesAffected;
+      return this;
+    }
+
+    public CachePoolStats build() {
+      return new CachePoolStats(bytesNeeded, bytesCached, filesAffected);
+    }
+  };
+
+  private final long bytesNeeded;
+  private final long bytesCached;
+  private final long filesAffected;
+
+  private CachePoolStats(long bytesNeeded, long bytesCached, long filesAffected) {
+    this.bytesNeeded = bytesNeeded;
+    this.bytesCached = bytesCached;
+    this.filesAffected = filesAffected;
+  }
+
+  public long getBytesNeeded() {
+    return bytesNeeded;
+  }
+
+  public long getBytesCached() {
+    return bytesNeeded;
+  }
+
+  public long getFilesAffected() {
+    return filesAffected;
+  }
+
+  public String toString() {
+    return new StringBuilder().append("{").
+      append("bytesNeeded:").append(bytesNeeded).
+      append(", bytesCached:").append(bytesCached).
+      append(", filesAffected:").append(filesAffected).
+      append("}").toString();
+  }
+}

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/ClientProtocol.java

@@ -1178,6 +1178,6 @@ public interface ClientProtocol {
    * @return A RemoteIterator which returns CachePool objects.
    */
   @Idempotent
-  public RemoteIterator<CachePoolInfo> listCachePools(String prevPool)
+  public RemoteIterator<CachePoolEntry> listCachePools(String prevPool)
       throws IOException;
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolServerSideTranslatorPB.java

@@ -30,6 +30,7 @@ import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
 import org.apache.hadoop.hdfs.protocol.CorruptFileBlocks;
 import org.apache.hadoop.hdfs.protocol.DirectoryListing;
@@ -51,6 +52,8 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AllowS
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AllowSnapshotResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AppendRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AppendResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CachePoolEntryProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CachePoolInfoProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CompleteRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CompleteResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ConcatRequestProto;
@@ -103,7 +106,6 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSna
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.IsFileClosedRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.IsFileClosedResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCachePoolsRequestProto;
-import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCachePoolsResponseElementProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCachePoolsResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCorruptFileBlocksRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCorruptFileBlocksResponseProto;
@@ -1136,18 +1138,15 @@ public class ClientNamenodeProtocolServerSideTranslatorPB implements
   public ListCachePoolsResponseProto listCachePools(RpcController controller,
       ListCachePoolsRequestProto request) throws ServiceException {
     try {
-      RemoteIterator<CachePoolInfo> iter =
+      RemoteIterator<CachePoolEntry> iter =
         server.listCachePools(request.getPrevPoolName());
       ListCachePoolsResponseProto.Builder responseBuilder =
         ListCachePoolsResponseProto.newBuilder();
       String prevPoolName = null;
       while (iter.hasNext()) {
-        CachePoolInfo pool = iter.next();
+        CachePoolEntry entry = iter.next();
-        ListCachePoolsResponseElementProto.Builder elemBuilder = 
+        responseBuilder.addEntries(PBHelper.convert(entry));
-            ListCachePoolsResponseElementProto.newBuilder();
+        prevPoolName = entry.getInfo().getPoolName();
-        elemBuilder.setInfo(PBHelper.convert(pool));
-        responseBuilder.addElements(elemBuilder.build());
-        prevPoolName = pool.getPoolName();
       }
       // fill in hasNext
       if (prevPoolName == null) {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolTranslatorPB.java

@@ -38,6 +38,7 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
 import org.apache.hadoop.hdfs.protocol.CorruptFileBlocks;
 import org.apache.hadoop.hdfs.protocol.DSQuotaExceededException;
@@ -61,6 +62,7 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AddCac
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AllowSnapshotRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AppendRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.AppendResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CachePoolEntryProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CompleteRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ConcatRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CreateRequestProto;
@@ -96,7 +98,6 @@ import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSna
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetSnapshottableDirListingResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.IsFileClosedRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCachePoolsRequestProto;
-import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCachePoolsResponseElementProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCachePoolsResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCorruptFileBlocksRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.ListCacheDirectivesRequestProto;
@@ -1138,23 +1139,23 @@ public class ClientNamenodeProtocolTranslatorPB implements
     }
   }
 
-  private static class BatchedCachePoolInfo
+  private static class BatchedCachePoolEntries
-    implements BatchedEntries<CachePoolInfo> {
+    implements BatchedEntries<CachePoolEntry> {
       private final ListCachePoolsResponseProto proto;
     
-    public BatchedCachePoolInfo(ListCachePoolsResponseProto proto) {
+    public BatchedCachePoolEntries(ListCachePoolsResponseProto proto) {
       this.proto = proto;
     }
       
     @Override
-    public CachePoolInfo get(int i) {
+    public CachePoolEntry get(int i) {
-      ListCachePoolsResponseElementProto elem = proto.getElements(i);
+      CachePoolEntryProto elem = proto.getEntries(i);
-      return PBHelper.convert(elem.getInfo());
+      return PBHelper.convert(elem);
     }
 
     @Override
     public int size() {
-      return proto.getElementsCount();
+      return proto.getEntriesCount();
     }
     
     @Override
@@ -1164,17 +1165,17 @@ public class ClientNamenodeProtocolTranslatorPB implements
   }
 
   private class CachePoolIterator 
-      extends BatchedRemoteIterator<String, CachePoolInfo> {
+      extends BatchedRemoteIterator<String, CachePoolEntry> {
 
     public CachePoolIterator(String prevKey) {
       super(prevKey);
     }
 
     @Override
-    public BatchedEntries<CachePoolInfo> makeRequest(String prevKey)
+    public BatchedEntries<CachePoolEntry> makeRequest(String prevKey)
         throws IOException {
       try {
-        return new BatchedCachePoolInfo(
+        return new BatchedCachePoolEntries(
             rpcProxy.listCachePools(null, 
               ListCachePoolsRequestProto.newBuilder().
                 setPrevPoolName(prevKey).build()));
@@ -1184,13 +1185,13 @@ public class ClientNamenodeProtocolTranslatorPB implements
     }
 
     @Override
-    public String elementToPrevKey(CachePoolInfo element) {
+    public String elementToPrevKey(CachePoolEntry entry) {
-      return element.getPoolName();
+      return entry.getInfo().getPoolName();
     }
   }
 
   @Override
-  public RemoteIterator<CachePoolInfo> listCachePools(String prevKey)
+  public RemoteIterator<CachePoolEntry> listCachePools(String prevKey)
       throws IOException {
     return new CachePoolIterator(prevKey);
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java

@@ -38,7 +38,9 @@ import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveStats;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
+import org.apache.hadoop.hdfs.protocol.CachePoolStats;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
 import org.apache.hadoop.hdfs.protocol.CorruptFileBlocks;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
@@ -60,7 +62,9 @@ import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CacheDirectiveEntryProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CacheDirectiveStatsProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CachePoolEntryProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CachePoolInfoProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CachePoolStatsProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CreateFlagProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.DatanodeReportTypeProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetFsStatsResponseProto;
@@ -1678,6 +1682,35 @@ public class PBHelper {
     return info;
   }
 
+  public static CachePoolStatsProto convert(CachePoolStats stats) {
+    CachePoolStatsProto.Builder builder = CachePoolStatsProto.newBuilder();
+    builder.setBytesNeeded(stats.getBytesNeeded());
+    builder.setBytesCached(stats.getBytesCached());
+    builder.setFilesAffected(stats.getFilesAffected());
+    return builder.build();
+  }
+
+  public static CachePoolStats convert (CachePoolStatsProto proto) {
+    CachePoolStats.Builder builder = new CachePoolStats.Builder();
+    builder.setBytesNeeded(proto.getBytesNeeded());
+    builder.setBytesCached(proto.getBytesCached());
+    builder.setFilesAffected(proto.getFilesAffected());
+    return builder.build();
+  }
+
+  public static CachePoolEntryProto convert(CachePoolEntry entry) {
+    CachePoolEntryProto.Builder builder = CachePoolEntryProto.newBuilder();
+    builder.setInfo(PBHelper.convert(entry.getInfo()));
+    builder.setStats(PBHelper.convert(entry.getStats()));
+    return builder.build();
+  }
+
+  public static CachePoolEntry convert (CachePoolEntryProto proto) {
+    CachePoolInfo info = PBHelper.convert(proto.getInfo());
+    CachePoolStats stats = PBHelper.convert(proto.getStats());
+    return new CachePoolEntry(info, stats);
+  }
+  
   public static HdfsProtos.ChecksumTypeProto convert(DataChecksum.Type type) {
     return HdfsProtos.ChecksumTypeProto.valueOf(type.id);
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/CacheReplicationMonitor.java

@@ -208,8 +208,6 @@ public class CacheReplicationMonitor extends Thread implements Closeable {
   /**
    * Scan all CacheDirectives.  Use the information to figure out
    * what cache replication factor each block should have.
-   *
-   * @param mark       Whether the current scan is setting or clearing the mark
    */
   private void rescanCacheDirectives() {
     FSDirectory fsDir = namesystem.getFSDirectory();
@@ -301,7 +299,7 @@ public class CacheReplicationMonitor extends Thread implements Closeable {
     pce.addBytesNeeded(neededTotal);
     pce.addBytesCached(cachedTotal);
     if (LOG.isTraceEnabled()) {
-      LOG.debug("Directive " + pce.getEntryId() + " is caching " +
+      LOG.debug("Directive " + pce.getId() + " is caching " +
           file.getFullPathName() + ": " + cachedTotal + "/" + neededTotal);
     }
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeStatistics.java

@@ -43,6 +43,12 @@ public interface DatanodeStatistics {
   /** @return the percentage of the block pool used space over the total capacity. */
   public float getPercentBlockPoolUsed();
   
+  /** @return the total cache capacity of all DataNodes */
+  public long getCacheCapacity();
+
+  /** @return the total cache used by all DataNodes */
+  public long getCacheUsed();
+
   /** @return the xceiver count */
   public int getXceiverCount();
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/HeartbeatManager.java

@@ -149,6 +149,17 @@ class HeartbeatManager implements DatanodeStatistics {
     return stats.xceiverCount;
   }
   
+  @Override
+  public synchronized long getCacheCapacity() {
+    return stats.cacheCapacity;
+  }
+
+  @Override
+  public synchronized long getCacheUsed() {
+    return stats.cacheUsed;
+  }
+  
+
   @Override
   public synchronized long[] getStats() {
     return new long[] {getCapacityTotal(),
@@ -308,6 +319,8 @@ class HeartbeatManager implements DatanodeStatistics {
     private long capacityRemaining = 0L;
     private long blockPoolUsed = 0L;
     private int xceiverCount = 0;
+    private long cacheCapacity = 0L;
+    private long cacheUsed = 0L;
 
     private int expiredHeartbeats = 0;
 
@@ -321,6 +334,8 @@ class HeartbeatManager implements DatanodeStatistics {
       } else {
         capacityTotal += node.getDfsUsed();
       }
+      cacheCapacity += node.getCacheCapacity();
+      cacheUsed += node.getCacheUsed();
     }
 
     private void subtract(final DatanodeDescriptor node) {
@@ -333,6 +348,8 @@ class HeartbeatManager implements DatanodeStatistics {
       } else {
         capacityTotal -= node.getDfsUsed();
       }
+      cacheCapacity -= node.getCacheCapacity();
+      cacheUsed -= node.getCacheUsed();
     }
     
     /** Increment expired heartbeat counter. */

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetCache.java

@@ -145,6 +145,8 @@ public class FsDatasetCache {
    */
   private final HashMap<Key, Value> mappableBlockMap = new HashMap<Key, Value>();
 
+  private final AtomicLong numBlocksCached = new AtomicLong(0);
+
   private final FsDatasetImpl dataset;
 
   private final ThreadPoolExecutor uncachingExecutor;
@@ -417,6 +419,7 @@ public class FsDatasetCache {
           LOG.debug("Successfully cached block " + key.id + " in " + key.bpid +
               ".  We are now caching " + newUsedBytes + " bytes in total.");
         }
+        numBlocksCached.addAndGet(1);
         success = true;
       } finally {
         if (!success) {
@@ -465,6 +468,7 @@ public class FsDatasetCache {
       }
       long newUsedBytes =
           usedBytesCount.release(value.mappableBlock.getLength());
+      numBlocksCached.addAndGet(-1);
       if (LOG.isDebugEnabled()) {
         LOG.debug("Uncaching of block " + key.id + " in " + key.bpid +
             " completed.  usedBytes = " + newUsedBytes);
@@ -477,14 +481,14 @@ public class FsDatasetCache {
   /**
    * Get the approximate amount of cache space used.
    */
-  public long getDnCacheUsed() {
+  public long getCacheUsed() {
     return usedBytesCount.get();
   }
 
   /**
    * Get the maximum amount of bytes we can cache.  This is a constant.
    */
-  public long getDnCacheCapacity() {
+  public long getCacheCapacity() {
     return maxBytes;
   }
 
@@ -496,4 +500,7 @@ public class FsDatasetCache {
     return numBlocksFailedToUncache.get();
   }
 
+  public long getNumBlocksCached() {
+    return numBlocksCached.get();
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java

@@ -292,12 +292,12 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
 
   @Override // FSDatasetMBean
   public long getCacheUsed() {
-    return cacheManager.getDnCacheUsed();
+    return cacheManager.getCacheUsed();
   }
 
   @Override // FSDatasetMBean
   public long getCacheCapacity() {
-    return cacheManager.getDnCacheCapacity();
+    return cacheManager.getCacheCapacity();
   }
 
   @Override // FSDatasetMBean
@@ -310,6 +310,11 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
     return cacheManager.getNumBlocksFailedToUncache();
   }
 
+  @Override // FSDatasetMBean
+  public long getNumBlocksCached() {
+    return cacheManager.getNumBlocksCached();
+  }
+
   /**
    * Find the block's on-disk length
    */

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/metrics/FSDatasetMBean.java

@@ -88,6 +88,11 @@ public interface FSDatasetMBean {
    */
   public long getCacheCapacity();
 
+  /**
+   * Returns the number of blocks cached.
+   */
+  public long getNumBlocksCached();
+
   /**
    * Returns the number of blocks that the datanode was unable to cache
    */

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/CacheManager.java

@@ -49,6 +49,7 @@ import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
@@ -99,24 +100,24 @@ public final class CacheManager {
   private final BlockManager blockManager;
 
   /**
-   * Cache entries, sorted by ID.
+   * Cache directives, sorted by ID.
    *
    * listCacheDirectives relies on the ordering of elements in this map
    * to track what has already been listed by the client.
    */
-  private final TreeMap<Long, CacheDirective> entriesById =
+  private final TreeMap<Long, CacheDirective> directivesById =
       new TreeMap<Long, CacheDirective>();
 
   /**
-   * The entry ID to use for a new entry.  Entry IDs always increase, and are
+   * The directive ID to use for a new directive.  IDs always increase, and are
    * never reused.
    */
-  private long nextEntryId;
+  private long nextDirectiveId;
 
   /**
-   * Cache entries, sorted by path
+   * Cache directives, sorted by path
    */
-  private final TreeMap<String, List<CacheDirective>> entriesByPath =
+  private final TreeMap<String, List<CacheDirective>> directivesByPath =
       new TreeMap<String, List<CacheDirective>>();
 
   /**
@@ -177,7 +178,7 @@ public final class CacheManager {
       BlockManager blockManager) {
     this.namesystem = namesystem;
     this.blockManager = blockManager;
-    this.nextEntryId = 1;
+    this.nextDirectiveId = 1;
     this.maxListCachePoolsResponses = conf.getInt(
         DFS_NAMENODE_LIST_CACHE_POOLS_NUM_RESPONSES,
         DFS_NAMENODE_LIST_CACHE_POOLS_NUM_RESPONSES_DEFAULT);
@@ -239,7 +240,7 @@ public final class CacheManager {
 
   public TreeMap<Long, CacheDirective> getEntriesById() {
     assert namesystem.hasReadLock();
-    return entriesById;
+    return directivesById;
   }
   
   @VisibleForTesting
@@ -250,10 +251,10 @@ public final class CacheManager {
 
   private long getNextEntryId() throws IOException {
     assert namesystem.hasWriteLock();
-    if (nextEntryId >= Long.MAX_VALUE - 1) {
+    if (nextDirectiveId >= Long.MAX_VALUE - 1) {
       throw new IOException("No more available IDs.");
     }
-    return nextEntryId++;
+    return nextDirectiveId++;
   }
 
   // Helper getter / validation methods
@@ -301,7 +302,7 @@ public final class CacheManager {
   }
 
   /**
-   * Get a CacheDirective by ID, validating the ID and that the entry
+   * Get a CacheDirective by ID, validating the ID and that the directive
    * exists.
    */
   private CacheDirective getById(long id) throws InvalidRequestException {
@@ -309,13 +310,13 @@ public final class CacheManager {
     if (id <= 0) {
       throw new InvalidRequestException("Invalid negative ID.");
     }
-    // Find the entry.
+    // Find the directive.
-    CacheDirective entry = entriesById.get(id);
+    CacheDirective directive = directivesById.get(id);
-    if (entry == null) {
+    if (directive == null) {
       throw new InvalidRequestException("No directive with ID " + id
           + " found.");
     }
-    return entry;
+    return directive;
   }
 
   /**
@@ -332,32 +333,34 @@ public final class CacheManager {
 
   // RPC handlers
 
-  private void addInternal(CacheDirective entry) {
+  private void addInternal(CacheDirective directive, CachePool pool) {
-    entriesById.put(entry.getEntryId(), entry);
+    boolean addedDirective = pool.getDirectiveList().add(directive);
-    String path = entry.getPath();
+    assert addedDirective;
-    List<CacheDirective> entryList = entriesByPath.get(path);
+    directivesById.put(directive.getId(), directive);
-    if (entryList == null) {
+    String path = directive.getPath();
-      entryList = new ArrayList<CacheDirective>(1);
+    List<CacheDirective> directives = directivesByPath.get(path);
-      entriesByPath.put(path, entryList);
+    if (directives == null) {
+      directives = new ArrayList<CacheDirective>(1);
+      directivesByPath.put(path, directives);
     }
-    entryList.add(entry);
+    directives.add(directive);
   }
 
   public CacheDirectiveInfo addDirective(
-      CacheDirectiveInfo directive, FSPermissionChecker pc)
+      CacheDirectiveInfo info, FSPermissionChecker pc)
       throws IOException {
     assert namesystem.hasWriteLock();
-    CacheDirective entry;
+    CacheDirective directive;
     try {
-      CachePool pool = getCachePool(validatePoolName(directive));
+      CachePool pool = getCachePool(validatePoolName(info));
       checkWritePermission(pc, pool);
-      String path = validatePath(directive);
+      String path = validatePath(info);
-      short replication = validateReplication(directive, (short)1);
+      short replication = validateReplication(info, (short)1);
       long id;
-      if (directive.getId() != null) {
+      if (info.getId() != null) {
-        // We are loading an entry from the edit log.
+        // We are loading a directive from the edit log.
         // Use the ID from the edit log.
-        id = directive.getId();
+        id = info.getId();
         if (id <= 0) {
           throw new InvalidRequestException("can't add an ID " +
               "of " + id + ": it is not positive.");
@@ -366,88 +369,90 @@ public final class CacheManager {
           throw new InvalidRequestException("can't add an ID " +
               "of " + id + ": it is too big.");
         }
-        if (nextEntryId <= id) {
+        if (nextDirectiveId <= id) {
-          nextEntryId = id + 1;
+          nextDirectiveId = id + 1;
         }
       } else {
-        // Add a new entry with the next available ID.
+        // Add a new directive with the next available ID.
         id = getNextEntryId();
       }
-      entry = new CacheDirective(id, path, replication, pool);
+      directive = new CacheDirective(id, path, replication);
-      addInternal(entry);
+      addInternal(directive, pool);
     } catch (IOException e) {
-      LOG.warn("addDirective of " + directive + " failed: ", e);
+      LOG.warn("addDirective of " + info + " failed: ", e);
       throw e;
     }
-    LOG.info("addDirective of " + directive + " successful.");
+    LOG.info("addDirective of " + info + " successful.");
     if (monitor != null) {
       monitor.kick();
     }
-    return entry.toDirective();
+    return directive.toInfo();
   }
 
-  public void modifyDirective(CacheDirectiveInfo directive,
+  public void modifyDirective(CacheDirectiveInfo info,
       FSPermissionChecker pc) throws IOException {
     assert namesystem.hasWriteLock();
     String idString =
-        (directive.getId() == null) ?
+        (info.getId() == null) ?
-            "(null)" : directive.getId().toString();
+            "(null)" : info.getId().toString();
     try {
       // Check for invalid IDs.
-      Long id = directive.getId();
+      Long id = info.getId();
       if (id == null) {
         throw new InvalidRequestException("Must supply an ID.");
       }
       CacheDirective prevEntry = getById(id);
       checkWritePermission(pc, prevEntry.getPool());
       String path = prevEntry.getPath();
-      if (directive.getPath() != null) {
+      if (info.getPath() != null) {
-        path = validatePath(directive);
+        path = validatePath(info);
       }
       short replication = prevEntry.getReplication();
-      if (directive.getReplication() != null) {
+      if (info.getReplication() != null) {
-        replication = validateReplication(directive, replication);
+        replication = validateReplication(info, replication);
       }
       CachePool pool = prevEntry.getPool();
-      if (directive.getPool() != null) {
+      if (info.getPool() != null) {
-        pool = getCachePool(validatePoolName(directive));
+        pool = getCachePool(validatePoolName(info));
         checkWritePermission(pc, pool);
       }
       removeInternal(prevEntry);
       CacheDirective newEntry =
-          new CacheDirective(id, path, replication, pool);
+          new CacheDirective(id, path, replication);
-      addInternal(newEntry);
+      addInternal(newEntry, pool);
     } catch (IOException e) {
       LOG.warn("modifyDirective of " + idString + " failed: ", e);
       throw e;
     }
     LOG.info("modifyDirective of " + idString + " successfully applied " +
-        directive + ".");
+        info+ ".");
   }
 
-  public void removeInternal(CacheDirective existing)
+  public void removeInternal(CacheDirective directive)
       throws InvalidRequestException {
     assert namesystem.hasWriteLock();
-    // Remove the corresponding entry in entriesByPath.
+    // Remove the corresponding entry in directivesByPath.
-    String path = existing.getPath();
+    String path = directive.getPath();
-    List<CacheDirective> entries = entriesByPath.get(path);
+    List<CacheDirective> directives = directivesByPath.get(path);
-    if (entries == null || !entries.remove(existing)) {
+    if (directives == null || !directives.remove(directive)) {
       throw new InvalidRequestException("Failed to locate entry " +
-          existing.getEntryId() + " by path " + existing.getPath());
+          directive.getId() + " by path " + directive.getPath());
     }
-    if (entries.size() == 0) {
+    if (directives.size() == 0) {
-      entriesByPath.remove(path);
+      directivesByPath.remove(path);
     }
-    entriesById.remove(existing.getEntryId());
+    directivesById.remove(directive.getId());
+    directive.getPool().getDirectiveList().remove(directive);
+    assert directive.getPool() == null;
   }
 
   public void removeDirective(long id, FSPermissionChecker pc)
       throws IOException {
     assert namesystem.hasWriteLock();
     try {
-      CacheDirective existing = getById(id);
+      CacheDirective directive = getById(id);
-      checkWritePermission(pc, existing.getPool());
+      checkWritePermission(pc, directive.getPool());
-      removeInternal(existing);
+      removeInternal(directive);
     } catch (IOException e) {
       LOG.warn("removeDirective of " + id + " failed: ", e);
       throw e;
@@ -478,13 +483,13 @@ public final class CacheManager {
         new ArrayList<CacheDirectiveEntry>(NUM_PRE_ALLOCATED_ENTRIES);
     int numReplies = 0;
     SortedMap<Long, CacheDirective> tailMap =
-      entriesById.tailMap(prevId + 1);
+      directivesById.tailMap(prevId + 1);
     for (Entry<Long, CacheDirective> cur : tailMap.entrySet()) {
       if (numReplies >= maxListCacheDirectivesNumResponses) {
         return new BatchedListEntries<CacheDirectiveEntry>(replies, true);
       }
-      CacheDirective curEntry = cur.getValue();
+      CacheDirective curDirective = cur.getValue();
-      CacheDirectiveInfo info = cur.getValue().toDirective();
+      CacheDirectiveInfo info = cur.getValue().toInfo();
       if (filter.getPool() != null && 
           !info.getPool().equals(filter.getPool())) {
         continue;
@@ -496,7 +501,7 @@ public final class CacheManager {
       boolean hasPermission = true;
       if (pc != null) {
         try {
-          pc.checkPermission(curEntry.getPool(), FsAction.READ);
+          pc.checkPermission(curDirective.getPool(), FsAction.READ);
         } catch (AccessControlException e) {
           hasPermission = false;
         }
@@ -530,7 +535,7 @@ public final class CacheManager {
     pool = CachePool.createFromInfoAndDefaults(info);
     cachePools.put(pool.getPoolName(), pool);
     LOG.info("Created new cache pool " + pool);
-    return pool.getInfo(null);
+    return pool.getInfo(true);
   }
 
   /**
@@ -599,39 +604,34 @@ public final class CacheManager {
       throw new InvalidRequestException(
           "Cannot remove non-existent cache pool " + poolName);
     }
-    
+    // Remove all directives in this pool.
-    // Remove entries using this pool
+    Iterator<CacheDirective> iter = pool.getDirectiveList().iterator();
-    // TODO: could optimize this somewhat to avoid the need to iterate
-    // over all entries in entriesById
-    Iterator<Entry<Long, CacheDirective>> iter = 
-        entriesById.entrySet().iterator();
     while (iter.hasNext()) {
-      Entry<Long, CacheDirective> entry = iter.next();
+      CacheDirective directive = iter.next();
-      if (entry.getValue().getPool() == pool) {
+      directivesByPath.remove(directive.getPath());
-        entriesByPath.remove(entry.getValue().getPath());
+      directivesById.remove(directive.getId());
-        iter.remove();
+      iter.remove();
-      }
     }
     if (monitor != null) {
       monitor.kick();
     }
   }
 
-  public BatchedListEntries<CachePoolInfo>
+  public BatchedListEntries<CachePoolEntry>
       listCachePools(FSPermissionChecker pc, String prevKey) {
     assert namesystem.hasReadLock();
     final int NUM_PRE_ALLOCATED_ENTRIES = 16;
-    ArrayList<CachePoolInfo> results = 
+    ArrayList<CachePoolEntry> results = 
-        new ArrayList<CachePoolInfo>(NUM_PRE_ALLOCATED_ENTRIES);
+        new ArrayList<CachePoolEntry>(NUM_PRE_ALLOCATED_ENTRIES);
     SortedMap<String, CachePool> tailMap = cachePools.tailMap(prevKey, false);
     int numListed = 0;
     for (Entry<String, CachePool> cur : tailMap.entrySet()) {
       if (numListed++ >= maxListCachePoolsResponses) {
-        return new BatchedListEntries<CachePoolInfo>(results, true);
+        return new BatchedListEntries<CachePoolEntry>(results, true);
       }
-      results.add(cur.getValue().getInfo(pc));
+      results.add(cur.getValue().getEntry(pc));
     }
-    return new BatchedListEntries<CachePoolInfo>(results, false);
+    return new BatchedListEntries<CachePoolEntry>(results, false);
   }
 
   public void setCachedLocations(LocatedBlock block) {
@@ -693,13 +693,6 @@ public final class CacheManager {
     for (Iterator<Long> iter = blockIds.iterator(); iter.hasNext(); ) {
       Block block = new Block(iter.next());
       BlockInfo blockInfo = blockManager.getStoredBlock(block);
-      if (blockInfo.getGenerationStamp() < block.getGenerationStamp()) {
-        // The NameNode will eventually remove or update the out-of-date block.
-        // Until then, we pretend that it isn't cached.
-        LOG.warn("Genstamp in cache report disagrees with our genstamp for " +
-          block + ": expected genstamp " + blockInfo.getGenerationStamp());
-        continue;
-      }
       if (!blockInfo.isComplete()) {
         LOG.warn("Ignoring block id " + block.getBlockId() + ", because " +
             "it is in not complete yet.  It is in state " + 
@@ -743,9 +736,9 @@ public final class CacheManager {
    */
   public void saveState(DataOutput out, String sdPath)
       throws IOException {
-    out.writeLong(nextEntryId);
+    out.writeLong(nextDirectiveId);
     savePools(out, sdPath);
-    saveEntries(out, sdPath);
+    saveDirectives(out, sdPath);
   }
 
   /**
@@ -755,10 +748,10 @@ public final class CacheManager {
    * @throws IOException
    */
   public void loadState(DataInput in) throws IOException {
-    nextEntryId = in.readLong();
+    nextDirectiveId = in.readLong();
-    // pools need to be loaded first since entries point to their parent pool
+    // pools need to be loaded first since directives point to their parent pool
     loadPools(in);
-    loadEntries(in);
+    loadDirectives(in);
   }
 
   /**
@@ -773,7 +766,7 @@ public final class CacheManager {
     Counter counter = prog.getCounter(Phase.SAVING_CHECKPOINT, step);
     out.writeInt(cachePools.size());
     for (CachePool pool: cachePools.values()) {
-      pool.getInfo(null).writeTo(out);
+      pool.getInfo(true).writeTo(out);
       counter.increment();
     }
     prog.endStep(Phase.SAVING_CHECKPOINT, step);
@@ -782,19 +775,19 @@ public final class CacheManager {
   /*
    * Save cache entries to fsimage
    */
-  private void saveEntries(DataOutput out, String sdPath)
+  private void saveDirectives(DataOutput out, String sdPath)
       throws IOException {
     StartupProgress prog = NameNode.getStartupProgress();
     Step step = new Step(StepType.CACHE_ENTRIES, sdPath);
     prog.beginStep(Phase.SAVING_CHECKPOINT, step);
-    prog.setTotal(Phase.SAVING_CHECKPOINT, step, entriesById.size());
+    prog.setTotal(Phase.SAVING_CHECKPOINT, step, directivesById.size());
     Counter counter = prog.getCounter(Phase.SAVING_CHECKPOINT, step);
-    out.writeInt(entriesById.size());
+    out.writeInt(directivesById.size());
-    for (CacheDirective entry: entriesById.values()) {
+    for (CacheDirective directive : directivesById.values()) {
-      out.writeLong(entry.getEntryId());
+      out.writeLong(directive.getId());
-      Text.writeString(out, entry.getPath());
+      Text.writeString(out, directive.getPath());
-      out.writeShort(entry.getReplication());
+      out.writeShort(directive.getReplication());
-      Text.writeString(out, entry.getPool().getPoolName());
+      Text.writeString(out, directive.getPool().getPoolName());
       counter.increment();
     }
     prog.endStep(Phase.SAVING_CHECKPOINT, step);
@@ -819,38 +812,41 @@ public final class CacheManager {
   }
 
   /**
-   * Load cache entries from the fsimage
+   * Load cache directives from the fsimage
    */
-  private void loadEntries(DataInput in) throws IOException {
+  private void loadDirectives(DataInput in) throws IOException {
     StartupProgress prog = NameNode.getStartupProgress();
     Step step = new Step(StepType.CACHE_ENTRIES);
     prog.beginStep(Phase.LOADING_FSIMAGE, step);
-    int numberOfEntries = in.readInt();
+    int numDirectives = in.readInt();
-    prog.setTotal(Phase.LOADING_FSIMAGE, step, numberOfEntries);
+    prog.setTotal(Phase.LOADING_FSIMAGE, step, numDirectives);
     Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, step);
-    for (int i = 0; i < numberOfEntries; i++) {
+    for (int i = 0; i < numDirectives; i++) {
-      long entryId = in.readLong();
+      long directiveId = in.readLong();
       String path = Text.readString(in);
       short replication = in.readShort();
       String poolName = Text.readString(in);
       // Get pool reference by looking it up in the map
       CachePool pool = cachePools.get(poolName);
       if (pool == null) {
-        throw new IOException("Entry refers to pool " + poolName +
+        throw new IOException("Directive refers to pool " + poolName +
             ", which does not exist.");
       }
-      CacheDirective entry =
+      CacheDirective directive =
-          new CacheDirective(entryId, path, replication, pool);
+          new CacheDirective(directiveId, path, replication);
-      if (entriesById.put(entry.getEntryId(), entry) != null) {
+      boolean addedDirective = pool.getDirectiveList().add(directive);
-        throw new IOException("An entry with ID " + entry.getEntryId() +
+      assert addedDirective;
+      if (directivesById.put(directive.getId(), directive) != null) {
+        throw new IOException("A directive with ID " + directive.getId() +
             " already exists");
       }
-      List<CacheDirective> entries = entriesByPath.get(entry.getPath());
+      List<CacheDirective> directives =
-      if (entries == null) {
+          directivesByPath.get(directive.getPath());
-        entries = new LinkedList<CacheDirective>();
+      if (directives == null) {
-        entriesByPath.put(entry.getPath(), entries);
+        directives = new LinkedList<CacheDirective>();
+        directivesByPath.put(directive.getPath(), directives);
       }
-      entries.add(entry);
+      directives.add(directive);
       counter.increment();
     }
     prog.endStep(Phase.LOADING_FSIMAGE, step);

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/CachePool.java

@@ -26,9 +26,13 @@ import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.hdfs.protocol.CacheDirective;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
+import org.apache.hadoop.hdfs.protocol.CachePoolStats;
 import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.util.IntrusiveCollection;
 
 import com.google.common.base.Preconditions;
 
@@ -69,6 +73,22 @@ public final class CachePool {
   
   private int weight;
 
+  public final static class DirectiveList
+      extends IntrusiveCollection<CacheDirective> {
+    private CachePool cachePool;
+
+    private DirectiveList(CachePool cachePool) {
+      this.cachePool = cachePool;
+    }
+
+    public CachePool getCachePool() {
+      return cachePool;
+    }
+  }
+
+  @Nonnull
+  private final DirectiveList directiveList = new DirectiveList(this);
+
   /**
    * Create a new cache pool based on a CachePoolInfo object and the defaults.
    * We will fill in information that was not supplied according to the
@@ -171,7 +191,7 @@ public final class CachePool {
    * @return
    *          Cache pool information.
    */
-  private CachePoolInfo getInfo(boolean fullInfo) {
+  CachePoolInfo getInfo(boolean fullInfo) {
     CachePoolInfo info = new CachePoolInfo(poolName);
     if (!fullInfo) {
       return info;
@@ -182,6 +202,19 @@ public final class CachePool {
         setWeight(weight);
   }
 
+  /**
+   * Get statistics about this CachePool.
+   *
+   * @return   Cache pool statistics.
+   */
+  private CachePoolStats getStats() {
+    return new CachePoolStats.Builder().
+        setBytesNeeded(0).
+        setBytesCached(0).
+        setFilesAffected(0).
+        build();
+  }
+
   /**
    * Returns a CachePoolInfo describing this CachePool based on the permissions
    * of the calling user. Unprivileged users will see only minimal descriptive
@@ -189,9 +222,9 @@ public final class CachePool {
    * 
    * @param pc Permission checker to be used to validate the user's permissions,
    *          or null
-   * @return CachePoolInfo describing this CachePool
+   * @return CachePoolEntry describing this CachePool
    */
-  public CachePoolInfo getInfo(FSPermissionChecker pc) {
+  public CachePoolEntry getEntry(FSPermissionChecker pc) {
     boolean hasPermission = true;
     if (pc != null) {
       try {
@@ -200,7 +233,8 @@ public final class CachePool {
         hasPermission = false;
       }
     }
-    return getInfo(hasPermission);
+    return new CachePoolEntry(getInfo(hasPermission), 
+        hasPermission ? getStats() : new CachePoolStats.Builder().build());
   }
 
   public String toString() {
@@ -212,4 +246,8 @@ public final class CachePool {
         append(", weight:").append(weight).
         append(" }").toString();
   }
+
+  public DirectiveList getDirectiveList() {
+    return directiveList;
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -164,6 +164,7 @@ import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
 import org.apache.hadoop.hdfs.protocol.RecoveryInProgressException;
@@ -6429,6 +6430,16 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
     return datanodeStatistics.getCapacityRemainingPercent();
   }
 
+  @Override // NameNodeMXBean
+  public long getCacheCapacity() {
+    return datanodeStatistics.getCacheCapacity();
+  }
+
+  @Override // NameNodeMXBean
+  public long getCacheUsed() {
+    return datanodeStatistics.getCacheUsed();
+  }
+
   @Override // NameNodeMXBean
   public long getTotalBlocks() {
     return getBlocksTotal();
@@ -7285,11 +7296,11 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
     getEditLog().logSync();
   }
 
-  public BatchedListEntries<CachePoolInfo> listCachePools(String prevKey)
+  public BatchedListEntries<CachePoolEntry> listCachePools(String prevKey)
       throws IOException {
     final FSPermissionChecker pc =
         isPermissionEnabled ? getPermissionChecker() : null;
-    BatchedListEntries<CachePoolInfo> results;
+    BatchedListEntries<CachePoolEntry> results;
     checkOperation(OperationCategory.READ);
     boolean success = false;
     readLock();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeMXBean.java

@@ -102,6 +102,16 @@ public interface NameNodeMXBean {
    */
   public float getPercentRemaining();
 
+  /**
+   * Returns the amount of cache used by the datanode (in bytes).
+   */
+  public long getCacheUsed();
+
+  /**
+   * Returns the total cache capacity of the datanode (in bytes).
+   */
+  public long getCacheCapacity();
+  
   /**
    * Get the total space used by the block pools of this namenode
    */

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeRpcServer.java

@@ -64,6 +64,7 @@ import org.apache.hadoop.hdfs.protocol.BlockListAsLongs;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CorruptFileBlocks;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
@@ -1298,26 +1299,26 @@ class NameNodeRpcServer implements NamenodeProtocols {
   }
 
   private class ServerSideCachePoolIterator 
-      extends BatchedRemoteIterator<String, CachePoolInfo> {
+      extends BatchedRemoteIterator<String, CachePoolEntry> {
 
     public ServerSideCachePoolIterator(String prevKey) {
       super(prevKey);
     }
 
     @Override
-    public BatchedEntries<CachePoolInfo> makeRequest(String prevKey)
+    public BatchedEntries<CachePoolEntry> makeRequest(String prevKey)
         throws IOException {
       return namesystem.listCachePools(prevKey);
     }
 
     @Override
-    public String elementToPrevKey(CachePoolInfo element) {
+    public String elementToPrevKey(CachePoolEntry entry) {
-      return element.getPoolName();
+      return entry.getInfo().getPoolName();
     }
   }
 
   @Override
-  public RemoteIterator<CachePoolInfo> listCachePools(String prevKey)
+  public RemoteIterator<CachePoolEntry> listCachePools(String prevKey)
       throws IOException {
     return new ServerSideCachePoolIterator(prevKey);
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/CacheAdmin.java

@@ -32,6 +32,7 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveStats;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.server.namenode.CachePool;
@@ -755,9 +756,10 @@ public class CacheAdmin extends Configured implements Tool {
           build();
       int numResults = 0;
       try {
-        RemoteIterator<CachePoolInfo> iter = dfs.listCachePools();
+        RemoteIterator<CachePoolEntry> iter = dfs.listCachePools();
         while (iter.hasNext()) {
-          CachePoolInfo info = iter.next();
+          CachePoolEntry entry = iter.next();
+          CachePoolInfo info = entry.getInfo();
           String[] row = new String[5];
           if (name == null || info.getPoolName().equals(name)) {
             row[0] = info.getPoolName();

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientNamenodeProtocol.proto

@@ -421,6 +421,12 @@ message CachePoolInfoProto {
   optional int32 weight = 5;
 }
 
+message CachePoolStatsProto {
+  required int64 bytesNeeded = 1;
+  required int64 bytesCached = 2;
+  required int64 filesAffected = 3;
+}
+
 message AddCachePoolRequestProto {
   required CachePoolInfoProto info = 1;
 }
@@ -447,12 +453,13 @@ message ListCachePoolsRequestProto {
 }
 
 message ListCachePoolsResponseProto {
-  repeated ListCachePoolsResponseElementProto elements = 1;
+  repeated CachePoolEntryProto entries = 1;
   required bool hasMore = 2;
 }
 
-message ListCachePoolsResponseElementProto {
+message CachePoolEntryProto {
   required CachePoolInfoProto info = 1;
+  required CachePoolStatsProto stats = 2;
 }
 
 message GetFileLinkInfoRequestProto {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java

@@ -505,6 +505,11 @@ public class SimulatedFSDataset implements FsDatasetSpi<FsVolumeSpi> {
     return 0l;
   }
 
+  @Override // FSDatasetMBean
+  public long getNumBlocksCached() {
+    return 0l;
+  }
+
   @Override
   public long getNumBlocksFailedToCache() {
     return 0l;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestFsDatasetCache.java

@@ -49,8 +49,8 @@ import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
+import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetCache;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetCache.PageRounder;
-import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.MappableBlock;
 import org.apache.hadoop.hdfs.server.namenode.EditLogFileOutputStream;
 import org.apache.hadoop.hdfs.server.namenode.FSImage;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
@@ -72,6 +72,8 @@ import org.junit.After;
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
+import org.apache.log4j.Level;
+import org.apache.log4j.LogManager;
 
 import com.google.common.base.Supplier;
 
@@ -95,6 +97,7 @@ public class TestFsDatasetCache {
 
   static {
     EditLogFileOutputStream.setShouldSkipFsyncForTesting(false);
+    LogManager.getLogger(FsDatasetCache.class).setLevel(Level.DEBUG);
   }
 
   @Before
@@ -201,17 +204,21 @@ public class TestFsDatasetCache {
   /**
    * Blocks until cache usage hits the expected new value.
    */
-  private long verifyExpectedCacheUsage(final long expected) throws Exception {
+  private long verifyExpectedCacheUsage(final long expectedCacheUsed,
+      final long expectedBlocks) throws Exception {
     GenericTestUtils.waitFor(new Supplier<Boolean>() {
       private int tries = 0;
       
       @Override
       public Boolean get() {
-        long curDnCacheUsed = fsd.getCacheUsed();
+        long curCacheUsed = fsd.getCacheUsed();
-        if (curDnCacheUsed != expected) {
+        long curBlocks = fsd.getNumBlocksCached();
+        if ((curCacheUsed != expectedCacheUsed) ||
+            (curBlocks != expectedBlocks)) {
           if (tries++ > 10) {
-            LOG.info("verifyExpectedCacheUsage: expected " +
+            LOG.info("verifyExpectedCacheUsage: have " +
-                expected + ", got " + curDnCacheUsed + "; " +
+                curCacheUsed + "/" + expectedCacheUsed + " bytes cached; " +
+                curBlocks + "/" + expectedBlocks + " blocks cached. " +
                 "memlock limit = " +
                 NativeIO.POSIX.getCacheManipulator().getMemlockLimit() +
                 ".  Waiting...");
@@ -221,14 +228,15 @@ public class TestFsDatasetCache {
         return true;
       }
     }, 100, 60000);
-    return expected;
+    return expectedCacheUsed;
   }
 
   private void testCacheAndUncacheBlock() throws Exception {
     LOG.info("beginning testCacheAndUncacheBlock");
     final int NUM_BLOCKS = 5;
 
-    verifyExpectedCacheUsage(0);
+    verifyExpectedCacheUsage(0, 0);
+    assertEquals(0, fsd.getNumBlocksCached());
 
     // Write a test file
     final Path testFile = new Path("/testCacheBlock");
@@ -255,7 +263,7 @@ public class TestFsDatasetCache {
     // Cache each block in succession, checking each time
     for (int i=0; i<NUM_BLOCKS; i++) {
       setHeartbeatResponse(cacheBlock(locs[i]));
-      current = verifyExpectedCacheUsage(current + blockSizes[i]);
+      current = verifyExpectedCacheUsage(current + blockSizes[i], i + 1);
       dnMetrics = getMetrics(dn.getMetrics().name());
       long cmds = MetricsAsserts.getLongCounter("BlocksCached", dnMetrics);
       assertTrue("Expected more cache requests from the NN ("
@@ -267,7 +275,8 @@ public class TestFsDatasetCache {
     // Uncache each block in succession, again checking each time
     for (int i=0; i<NUM_BLOCKS; i++) {
       setHeartbeatResponse(uncacheBlock(locs[i]));
-      current = verifyExpectedCacheUsage(current - blockSizes[i]);
+      current = verifyExpectedCacheUsage(current - blockSizes[i],
+          NUM_BLOCKS - 1 - i);
       dnMetrics = getMetrics(dn.getMetrics().name());
       long cmds = MetricsAsserts.getLongCounter("BlocksUncached", dnMetrics);
       assertTrue("Expected more uncache requests from the NN",
@@ -334,10 +343,11 @@ public class TestFsDatasetCache {
 
     // Cache the first n-1 files
     long total = 0;
-    verifyExpectedCacheUsage(0);
+    verifyExpectedCacheUsage(0, 0);
     for (int i=0; i<numFiles-1; i++) {
       setHeartbeatResponse(cacheBlocks(fileLocs[i]));
-      total = verifyExpectedCacheUsage(rounder.round(total + fileSizes[i]));
+      total = verifyExpectedCacheUsage(
+          rounder.round(total + fileSizes[i]), 4 * (i + 1));
     }
 
     // nth file should hit a capacity exception
@@ -363,7 +373,7 @@ public class TestFsDatasetCache {
     for (int i=0; i<numFiles-1; i++) {
       setHeartbeatResponse(uncacheBlocks(fileLocs[i]));
       total -= rounder.round(fileSizes[i]);
-      verifyExpectedCacheUsage(total);
+      verifyExpectedCacheUsage(total, 4 * (numFiles - 2 - i));
     }
     LOG.info("finishing testFilesExceedMaxLockedMemory");
   }
@@ -373,7 +383,7 @@ public class TestFsDatasetCache {
     LOG.info("beginning testUncachingBlocksBeforeCachingFinishes");
     final int NUM_BLOCKS = 5;
 
-    verifyExpectedCacheUsage(0);
+    verifyExpectedCacheUsage(0, 0);
 
     // Write a test file
     final Path testFile = new Path("/testCacheBlock");
@@ -409,7 +419,7 @@ public class TestFsDatasetCache {
     // should increase, even though caching doesn't complete on any of them.
     for (int i=0; i<NUM_BLOCKS; i++) {
       setHeartbeatResponse(cacheBlock(locs[i]));
-      current = verifyExpectedCacheUsage(current + blockSizes[i]);
+      current = verifyExpectedCacheUsage(current + blockSizes[i], i + 1);
     }
     
     setHeartbeatResponse(new DatanodeCommand[] {
@@ -417,7 +427,7 @@ public class TestFsDatasetCache {
     });
 
     // wait until all caching jobs are finished cancelling.
-    current = verifyExpectedCacheUsage(0);
+    current = verifyExpectedCacheUsage(0, 0);
     LOG.info("finishing testUncachingBlocksBeforeCachingFinishes");
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCacheDirectives.java

@@ -55,6 +55,7 @@ import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveStats;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.server.blockmanagement.CacheReplicationMonitor;
@@ -263,8 +264,8 @@ public class TestCacheDirectives {
         setOwnerName(ownerName).setGroupName(groupName).
         setMode(mode).setWeight(weight));
     
-    RemoteIterator<CachePoolInfo> iter = dfs.listCachePools();
+    RemoteIterator<CachePoolEntry> iter = dfs.listCachePools();
-    CachePoolInfo info = iter.next();
+    CachePoolInfo info = iter.next().getInfo();
     assertEquals(poolName, info.getPoolName());
     assertEquals(ownerName, info.getOwnerName());
     assertEquals(groupName, info.getGroupName());
@@ -278,7 +279,7 @@ public class TestCacheDirectives {
         setMode(mode).setWeight(weight));
 
     iter = dfs.listCachePools();
-    info = iter.next();
+    info = iter.next().getInfo();
     assertEquals(poolName, info.getPoolName());
     assertEquals(ownerName, info.getOwnerName());
     assertEquals(groupName, info.getGroupName());
@@ -507,9 +508,9 @@ public class TestCacheDirectives {
         .setGroupName(groupName)
         .setMode(mode)
         .setWeight(weight));
-    RemoteIterator<CachePoolInfo> pit = dfs.listCachePools();
+    RemoteIterator<CachePoolEntry> pit = dfs.listCachePools();
     assertTrue("No cache pools found", pit.hasNext());
-    CachePoolInfo info = pit.next();
+    CachePoolInfo info = pit.next().getInfo();
     assertEquals(pool, info.getPoolName());
     assertEquals(groupName, info.getGroupName());
     assertEquals(mode, info.getMode());
@@ -542,7 +543,7 @@ public class TestCacheDirectives {
     // Check that state came back up
     pit = dfs.listCachePools();
     assertTrue("No cache pools found", pit.hasNext());
-    info = pit.next();
+    info = pit.next().getInfo();
     assertEquals(pool, info.getPoolName());
     assertEquals(pool, info.getPoolName());
     assertEquals(groupName, info.getGroupName());
@@ -713,7 +714,16 @@ public class TestCacheDirectives {
     try {
       cluster.waitActive();
       DistributedFileSystem dfs = cluster.getFileSystem();
-      NameNode namenode = cluster.getNameNode();
+      final NameNode namenode = cluster.getNameNode();
+      GenericTestUtils.waitFor(new Supplier<Boolean>() {
+        @Override
+        public Boolean get() {
+          return ((namenode.getNamesystem().getCacheCapacity() ==
+              (NUM_DATANODES * CACHE_CAPACITY)) &&
+                (namenode.getNamesystem().getCacheUsed() == 0));
+        }
+      }, 500, 60000);
+
       NamenodeProtocols nnRpc = namenode.getRpcServer();
       Path rootDir = helper.getDefaultWorkingDirectory(dfs);
       // Create the pool
@@ -967,8 +977,8 @@ public class TestCacheDirectives {
     dfs.addCachePool(new CachePoolInfo(poolName)
         .setMode(new FsPermission((short)0700)));
     // Should only see partial info
-    RemoteIterator<CachePoolInfo> it = myDfs.listCachePools();
+    RemoteIterator<CachePoolEntry> it = myDfs.listCachePools();
-    CachePoolInfo info = it.next();
+    CachePoolInfo info = it.next().getInfo();
     assertFalse(it.hasNext());
     assertEquals("Expected pool name", poolName, info.getPoolName());
     assertNull("Unexpected owner name", info.getOwnerName());
@@ -981,7 +991,7 @@ public class TestCacheDirectives {
         .setWeight(99));
     // Should see full info
     it = myDfs.listCachePools();
-    info = it.next();
+    info = it.next().getInfo();
     assertFalse(it.hasNext());
     assertEquals("Expected pool name", poolName, info.getPoolName());
     assertEquals("Mismatched owner name", myUser.getShortUserName(),

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeMXBean.java

@@ -31,7 +31,10 @@ import javax.management.ObjectName;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.io.nativeio.NativeIO;
+import org.apache.hadoop.io.nativeio.NativeIO.POSIX.NoMlockCacheManipulator;
 import org.apache.hadoop.util.VersionInfo;
 import org.junit.Test;
 import org.mortbay.util.ajax.JSON;
@@ -46,10 +49,16 @@ public class TestNameNodeMXBean {
    */
   private static final double DELTA = 0.000001;
 
+  static {
+    NativeIO.POSIX.setCacheManipulator(new NoMlockCacheManipulator());
+  }
+
   @SuppressWarnings({ "unchecked" })
   @Test
   public void testNameNodeMXBeanInfo() throws Exception {
     Configuration conf = new Configuration();
+    conf.setLong(DFSConfigKeys.DFS_DATANODE_MAX_LOCKED_MEMORY_KEY,
+      NativeIO.POSIX.getCacheManipulator().getMemlockLimit());
     MiniDFSCluster cluster = null;
 
     try {
@@ -171,6 +180,10 @@ public class TestNameNodeMXBean {
       }
       assertEquals(1, statusMap.get("active").size());
       assertEquals(1, statusMap.get("failed").size());
+      assertEquals(0L, mbs.getAttribute(mxbeanName, "CacheUsed"));
+      assertEquals(NativeIO.POSIX.getCacheManipulator().getMemlockLimit() * 
+          cluster.getDataNodes().size(),
+              mbs.getAttribute(mxbeanName, "CacheCapacity"));
     } finally {
       if (cluster != null) {
         for (URI dir : cluster.getNameDirs(0)) {

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestRetryCacheWithHA.java

@@ -54,6 +54,7 @@ import org.apache.hadoop.hdfs.MiniDFSNNTopology;
 import org.apache.hadoop.hdfs.NameNodeProxies;
 import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
 import org.apache.hadoop.hdfs.client.HdfsDataOutputStream.SyncFlag;
+import org.apache.hadoop.hdfs.protocol.CachePoolEntry;
 import org.apache.hadoop.hdfs.protocol.CachePoolInfo;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
@@ -904,7 +905,7 @@ public class TestRetryCacheWithHA {
     @Override
     boolean checkNamenodeBeforeReturn() throws Exception {
       for (int i = 0; i < CHECKTIMES; i++) {
-        RemoteIterator<CachePoolInfo> iter = dfs.listCachePools();
+        RemoteIterator<CachePoolEntry> iter = dfs.listCachePools();
         if (iter.hasNext()) {
           return true;
         }
@@ -941,8 +942,8 @@ public class TestRetryCacheWithHA {
     @Override
     boolean checkNamenodeBeforeReturn() throws Exception {
       for (int i = 0; i < CHECKTIMES; i++) {
-        RemoteIterator<CachePoolInfo> iter = dfs.listCachePools();
+        RemoteIterator<CachePoolEntry> iter = dfs.listCachePools();
-        if (iter.hasNext() && iter.next().getWeight() == 99) {
+        if (iter.hasNext() && iter.next().getInfo().getWeight() == 99) {
           return true;
         }
         Thread.sleep(1000);
@@ -978,7 +979,7 @@ public class TestRetryCacheWithHA {
     @Override
     boolean checkNamenodeBeforeReturn() throws Exception {
       for (int i = 0; i < CHECKTIMES; i++) {
-        RemoteIterator<CachePoolInfo> iter = dfs.listCachePools();
+        RemoteIterator<CachePoolEntry> iter = dfs.listCachePools();
         if (!iter.hasNext()) {
           return true;
         }