HDFS-7412. Move RetryCache to NameNodeRpcServer. Contributed by Haohui Mai.

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

@@ -388,6 +388,8 @@ Release 2.7.0 - UNRELEASED
     HDFS-7331. Add Datanode network counts to datanode jmx page. (Charles Lamb
     via atm)
 
+    HDFS-7412. Move RetryCache to NameNodeRpcServer. (wheat9)
+
   OPTIMIZATIONS
 
   BUG FIXES

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

@@ -1943,28 +1943,18 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @param srcs file that will be concatenated
    * @throws IOException on error
    */
-  void concat(String target, String [] srcs) 
+  void concat(String target, String [] srcs, boolean logRetryCache)
       throws IOException, UnresolvedLinkException {
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
-    
-    // Either there is no previous request in progress or it has failed
     if(FSNamesystem.LOG.isDebugEnabled()) {
       FSNamesystem.LOG.debug("concat " + Arrays.toString(srcs) +
           " to " + target);
     }
 
-    boolean success = false;
     try {
-      concatInt(target, srcs, cacheEntry != null);
+      concatInt(target, srcs, logRetryCache);
-      success = true;
     } catch (AccessControlException e) {
       logAuditEvent(false, "concat", Arrays.toString(srcs), target, null);
       throw e;
-    } finally {
-      RetryCache.setState(cacheEntry, success);
     }
   }
 
@@ -2181,7 +2171,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * Create a symbolic link.
    */
   void createSymlink(String target, String link,
-      PermissionStatus dirPerms, boolean createParent) 
+      PermissionStatus dirPerms, boolean createParent, boolean logRetryCache)
       throws IOException, UnresolvedLinkException {
     if (!DFSUtil.isValidName(link)) {
       throw new InvalidPathException("Invalid link name: " + link);
@@ -2189,19 +2179,14 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     if (FSDirectory.isReservedName(target)) {
       throw new InvalidPathException("Invalid target name: " + target);
     }
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
     boolean success = false;
     try {
-      createSymlinkInt(target, link, dirPerms, createParent, cacheEntry != null);
+      createSymlinkInt(target, link, dirPerms, createParent, logRetryCache);
       success = true;
     } catch (AccessControlException e) {
       logAuditEvent(false, "createSymlink", link, target, null);
       throw e;
-    } finally {
-      RetryCache.setState(cacheEntry, success);
     }
   }
 
@@ -2489,26 +2474,19 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
   HdfsFileStatus startFile(String src, PermissionStatus permissions,
       String holder, String clientMachine, EnumSet<CreateFlag> flag,
       boolean createParent, short replication, long blockSize, 
-      CryptoProtocolVersion[] supportedVersions)
+      CryptoProtocolVersion[] supportedVersions, boolean logRetryCache)
       throws AccessControlException, SafeModeException,
       FileAlreadyExistsException, UnresolvedLinkException,
       FileNotFoundException, ParentNotDirectoryException, IOException {
-    HdfsFileStatus status = null;
-    CacheEntryWithPayload cacheEntry = RetryCache.waitForCompletion(retryCache,
-        null);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return (HdfsFileStatus) cacheEntry.getPayload();
-    }
 
+    HdfsFileStatus status = null;
     try {
       status = startFileInt(src, permissions, holder, clientMachine, flag,
           createParent, replication, blockSize, supportedVersions,
-          cacheEntry != null);
+          logRetryCache);
     } catch (AccessControlException e) {
       logAuditEvent(false, "create", src);
       throw e;
-    } finally {
-      RetryCache.setState(cacheEntry, status != null, status);
     }
     return status;
   }
@@ -3035,27 +3013,14 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
   /**
    * Append to an existing file in the namespace.
    */
-  LocatedBlock appendFile(String src, String holder, String clientMachine)
+  LocatedBlock appendFile(
-      throws AccessControlException, SafeModeException,
+      String src, String holder, String clientMachine, boolean logRetryCache)
-      FileAlreadyExistsException, FileNotFoundException,
+      throws IOException {
-      ParentNotDirectoryException, IOException {
-    LocatedBlock lb = null;
-    CacheEntryWithPayload cacheEntry = RetryCache.waitForCompletion(retryCache,
-        null);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return (LocatedBlock) cacheEntry.getPayload();
-    }
-      
-    boolean success = false;
     try {
-      lb = appendFileInt(src, holder, clientMachine, cacheEntry != null);
+      return appendFileInt(src, holder, clientMachine, logRetryCache);
-      success = true;
-      return lb;
     } catch (AccessControlException e) {
       logAuditEvent(false, "append", src);
       throw e;
-    } finally {
-      RetryCache.setState(cacheEntry, success, lb);
     }
   }
 
@@ -3717,20 +3682,14 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @deprecated Use {@link #renameTo(String, String, Options.Rename...)} instead.
    */
   @Deprecated
-  boolean renameTo(String src, String dst) 
+  boolean renameTo(String src, String dst, boolean logRetryCache)
       throws IOException, UnresolvedLinkException {
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return true; // Return previous response
-    }
     boolean ret = false;
     try {
-      ret = renameToInt(src, dst, cacheEntry != null);
+      ret = renameToInt(src, dst, logRetryCache);
     } catch (AccessControlException e) {
       logAuditEvent(false, "rename", src, dst, null);
       throw e;
-    } finally {
-      RetryCache.setState(cacheEntry, ret);
     }
     return ret;
   }
@@ -3775,7 +3734,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     return status;
   }
 
-  /** @deprecated See {@link #renameTo(String, String)} */
+  /** @deprecated See {@link #renameTo(String, String, boolean)} */
   @Deprecated
   private boolean renameToInternal(FSPermissionChecker pc, String src,
       String dst, boolean logRetryCache) throws IOException,
@@ -3808,7 +3767,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
   
 
   /** Rename src to dst */
-  void renameTo(final String srcArg, final String dstArg,
+  void renameTo(final String srcArg, final String dstArg, boolean logRetryCache,
       Options.Rename... options) throws IOException, UnresolvedLinkException {
     String src = srcArg;
     String dst = dstArg;
@@ -3822,14 +3781,10 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     final FSPermissionChecker pc = getPermissionChecker();
     
     checkOperation(OperationCategory.WRITE);
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
     byte[][] srcComponents = FSDirectory.getPathComponentsForReservedPath(src);
     byte[][] dstComponents = FSDirectory.getPathComponentsForReservedPath(dst);
     HdfsFileStatus resultingStat = null;
-    boolean success = false;
     writeLock();
     BlocksMapUpdateInfo collectedBlocks = new BlocksMapUpdateInfo();
     try {
@@ -3837,13 +3792,10 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       checkNameNodeSafeMode("Cannot rename " + src);
       src = dir.resolvePath(pc, src, srcComponents);
       dst = dir.resolvePath(pc, dst, dstComponents);
-      renameToInternal(pc, src, dst, cacheEntry != null, 
+      renameToInternal(pc, src, dst, logRetryCache, collectedBlocks, options);
-          collectedBlocks, options);
       resultingStat = getAuditFileInfo(dst, false);
-      success = true;
     } finally {
       writeUnlock();
-      RetryCache.setState(cacheEntry, success);
     }
     getEditLog().logSync();
     if (!collectedBlocks.getToDeleteList().isEmpty()) {
@@ -3886,21 +3838,16 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @see ClientProtocol#delete(String, boolean) for detailed description and 
    * description of exceptions
    */
-  boolean delete(String src, boolean recursive)
+  boolean delete(String src, boolean recursive, boolean logRetryCache)
       throws AccessControlException, SafeModeException,
       UnresolvedLinkException, IOException {
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return true; // Return previous response
-    }
     boolean ret = false;
     try {
-      ret = deleteInt(src, recursive, cacheEntry != null);
+      ret = deleteInt(src, recursive, logRetryCache);
     } catch (AccessControlException e) {
       logAuditEvent(false, "delete", src);
       throw e;
-    } finally {
-      RetryCache.setState(cacheEntry, ret);
     }
     return ret;
   }
@@ -5479,11 +5426,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     checkOperation(OperationCategory.UNCHECKED);
     checkSuperuserPrivilege();
 
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
-    boolean success = false;
     readLock();
     try {
       checkOperation(OperationCategory.UNCHECKED);
@@ -5493,10 +5436,8 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
             + "in order to create namespace image.");
       }
       getFSImage().saveNamespace(this);
-      success = true;
     } finally {
       readUnlock();
-      RetryCache.setState(cacheEntry, success);
     }
     LOG.info("New namespace image has been created");
   }
@@ -6327,24 +6268,18 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
   NamenodeCommand startCheckpoint(NamenodeRegistration backupNode,
       NamenodeRegistration activeNamenode) throws IOException {
     checkOperation(OperationCategory.CHECKPOINT);
-    CacheEntryWithPayload cacheEntry = RetryCache.waitForCompletion(retryCache,
-        null);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return (NamenodeCommand) cacheEntry.getPayload();
-    }
     writeLock();
-    NamenodeCommand cmd = null;
     try {
       checkOperation(OperationCategory.CHECKPOINT);
       checkNameNodeSafeMode("Checkpoint not started");
       
       LOG.info("Start checkpoint for " + backupNode.getAddress());
-      cmd = getFSImage().startCheckpoint(backupNode, activeNamenode);
+      NamenodeCommand cmd = getFSImage().startCheckpoint(backupNode,
+          activeNamenode);
       getEditLog().logSync();
       return cmd;
     } finally {
       writeUnlock();
-      RetryCache.setState(cacheEntry, cmd != null, cmd);
     }
   }
 
@@ -6362,22 +6297,14 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
   void endCheckpoint(NamenodeRegistration registration,
                             CheckpointSignature sig) throws IOException {
     checkOperation(OperationCategory.CHECKPOINT);
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
-    boolean success = false;
     readLock();
     try {
       checkOperation(OperationCategory.CHECKPOINT);
-
       checkNameNodeSafeMode("Checkpoint not ended");
       LOG.info("End checkpoint for " + registration.getAddress());
       getFSImage().endCheckpoint(sig);
-      success = true;
     } finally {
       readUnlock();
-      RetryCache.setState(cacheEntry, success);
     }
   }
 
@@ -6821,14 +6748,12 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @param newNodes datanodes in the pipeline
    * @throws IOException if any error occurs
    */
-  void updatePipeline(String clientName, ExtendedBlock oldBlock, 
+  void updatePipeline(
-      ExtendedBlock newBlock, DatanodeID[] newNodes, String[] newStorageIDs)
+      String clientName, ExtendedBlock oldBlock, ExtendedBlock newBlock,
+      DatanodeID[] newNodes, String[] newStorageIDs, boolean logRetryCache)
       throws IOException {
     checkOperation(OperationCategory.WRITE);
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
     LOG.info("updatePipeline(" + oldBlock.getLocalBlock()
              + ", newGS=" + newBlock.getGenerationStamp()
              + ", newLength=" + newBlock.getNumBytes()
@@ -6837,18 +6762,15 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
              + ")");
     waitForLoadingFSImage();
     writeLock();
-    boolean success = false;
     try {
       checkOperation(OperationCategory.WRITE);
       checkNameNodeSafeMode("Pipeline not updated");
       assert newBlock.getBlockId()==oldBlock.getBlockId() : newBlock + " and "
         + oldBlock + " has different block identifier";
       updatePipelineInternal(clientName, oldBlock, newBlock, newNodes,
-          newStorageIDs, cacheEntry != null);
+          newStorageIDs, logRetryCache);
-      success = true;
     } finally {
       writeUnlock();
-      RetryCache.setState(cacheEntry, success);
     }
     getEditLog().logSync();
     LOG.info("updatePipeline(" + oldBlock.getLocalBlock() + " => "
@@ -7844,15 +7766,12 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @param snapshotRoot The directory path where the snapshot is taken
    * @param snapshotName The name of the snapshot
    */
-  String createSnapshot(String snapshotRoot, String snapshotName)
+  String createSnapshot(String snapshotRoot, String snapshotName,
+                        boolean logRetryCache)
       throws SafeModeException, IOException {
     checkOperation(OperationCategory.WRITE);
     final FSPermissionChecker pc = getPermissionChecker();
-    CacheEntryWithPayload cacheEntry = RetryCache.waitForCompletion(retryCache,
+
-        null);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return (String) cacheEntry.getPayload();
-    }
     String snapshotPath = null;
     writeLock();
     try {
@@ -7878,11 +7797,9 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       } finally {
         dir.writeUnlock();
       }
-      getEditLog().logCreateSnapshot(snapshotRoot, snapshotName,
+      getEditLog().logCreateSnapshot(snapshotRoot, snapshotName, logRetryCache);
-          cacheEntry != null);
     } finally {
       writeUnlock();
-      RetryCache.setState(cacheEntry, snapshotPath != null, snapshotPath);
     }
     getEditLog().logSync();
     
@@ -7900,16 +7817,14 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @throws SafeModeException
    * @throws IOException 
    */
-  void renameSnapshot(String path, String snapshotOldName,
+  void renameSnapshot(
-      String snapshotNewName) throws SafeModeException, IOException {
+      String path, String snapshotOldName, String snapshotNewName,
+      boolean logRetryCache) throws IOException {
     checkOperation(OperationCategory.WRITE);
     final FSPermissionChecker pc = getPermissionChecker();
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
     writeLock();
-    boolean success = false;
+
     try {
       checkOperation(OperationCategory.WRITE);
       checkNameNodeSafeMode("Cannot rename snapshot for " + path);
@@ -7920,11 +7835,10 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       
       snapshotManager.renameSnapshot(path, snapshotOldName, snapshotNewName);
       getEditLog().logRenameSnapshot(path, snapshotOldName, snapshotNewName,
-          cacheEntry != null);
+          logRetryCache);
-      success = true;
     } finally {
       writeUnlock();
-      RetryCache.setState(cacheEntry, success);
+
     }
     getEditLog().logSync();
     
@@ -8014,16 +7928,12 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @throws SafeModeException
    * @throws IOException
    */
-  void deleteSnapshot(String snapshotRoot, String snapshotName)
+  void deleteSnapshot(String snapshotRoot, String snapshotName,
+                      boolean logRetryCache)
       throws SafeModeException, IOException {
     checkOperation(OperationCategory.WRITE);
     final FSPermissionChecker pc = getPermissionChecker();
 
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
-    boolean success = false;
     BlocksMapUpdateInfo collectedBlocks = new BlocksMapUpdateInfo();
     writeLock();
     try {
@@ -8043,12 +7953,10 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
         dir.writeUnlock();
       }
       removedINodes.clear();
-      getEditLog().logDeleteSnapshot(snapshotRoot, snapshotName,
+      getEditLog().logDeleteSnapshot(snapshotRoot, snapshotName, logRetryCache);
-          cacheEntry != null);
-      success = true;
     } finally {
       writeUnlock();
-      RetryCache.setState(cacheEntry, success);
+
     }
     getEditLog().logSync();
 
@@ -8246,20 +8154,17 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     return new RollingUpgradeInfo(blockPoolId, false, startTime, finalizeTime);
   }
 
-  long addCacheDirective(CacheDirectiveInfo directive, EnumSet<CacheFlag> flags)
+  long addCacheDirective(CacheDirectiveInfo directive,
+                         EnumSet<CacheFlag> flags, boolean logRetryCache)
       throws IOException {
     checkOperation(OperationCategory.WRITE);
     final FSPermissionChecker pc = isPermissionEnabled ?
         getPermissionChecker() : null;
-    CacheEntryWithPayload cacheEntry =
+
-        RetryCache.waitForCompletion(retryCache, null);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return (Long) cacheEntry.getPayload();
-    }
-    boolean success = false;
     if (!flags.contains(CacheFlag.FORCE)) {
       cacheManager.waitForRescanIfNeeded();
     }
+    boolean success = false;
     writeLock();
     String effectiveDirectiveStr = null;
     Long result = null;
@@ -8275,8 +8180,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       }
       CacheDirectiveInfo effectiveDirective =
           cacheManager.addDirective(directive, pc, flags);
-      getEditLog().logAddCacheDirectiveInfo(effectiveDirective,
+      getEditLog().logAddCacheDirectiveInfo(effectiveDirective, logRetryCache);
-          cacheEntry != null);
       result = effectiveDirective.getId();
       effectiveDirectiveStr = effectiveDirective.toString();
       success = true;
@@ -8288,21 +8192,18 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       if (isAuditEnabled() && isExternalInvocation()) {
         logAuditEvent(success, "addCacheDirective", effectiveDirectiveStr, null, null);
       }
-      RetryCache.setState(cacheEntry, success, result);
+
     }
     return result;
   }
 
   void modifyCacheDirective(CacheDirectiveInfo directive,
-      EnumSet<CacheFlag> flags) throws IOException {
+      EnumSet<CacheFlag> flags, boolean logRetryCache) throws IOException {
     checkOperation(OperationCategory.WRITE);
     final FSPermissionChecker pc = isPermissionEnabled ?
         getPermissionChecker() : null;
     boolean success = false;
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return;
-    }
     if (!flags.contains(CacheFlag.FORCE)) {
       cacheManager.waitForRescanIfNeeded();
     }
@@ -8314,8 +8215,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
             "Cannot add cache directive", safeMode);
       }
       cacheManager.modifyDirective(directive, pc, flags);
-      getEditLog().logModifyCacheDirectiveInfo(directive,
+      getEditLog().logModifyCacheDirectiveInfo(directive, logRetryCache);
-          cacheEntry != null);
       success = true;
     } finally {
       writeUnlock();
@@ -8326,18 +8226,14 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
         String idStr = "{id: " + directive.getId().toString() + "}";
         logAuditEvent(success, "modifyCacheDirective", idStr, directive.toString(), null);
       }
-      RetryCache.setState(cacheEntry, success);
     }
   }
 
-  void removeCacheDirective(Long id) throws IOException {
+  void removeCacheDirective(long id, boolean logRetryCache) throws IOException {
     checkOperation(OperationCategory.WRITE);
     final FSPermissionChecker pc = isPermissionEnabled ?
         getPermissionChecker() : null;
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return;
-    }
     boolean success = false;
     writeLock();
     try {
@@ -8347,16 +8243,15 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
             "Cannot remove cache directives", safeMode);
       }
       cacheManager.removeDirective(id, pc);
-      getEditLog().logRemoveCacheDirectiveInfo(id, cacheEntry != null);
+      getEditLog().logRemoveCacheDirectiveInfo(id, logRetryCache);
       success = true;
     } finally {
       writeUnlock();
       if (isAuditEnabled() && isExternalInvocation()) {
-        String idStr = "{id: " + id.toString() + "}";
+        String idStr = "{id: " + Long.toString(id) + "}";
         logAuditEvent(success, "removeCacheDirective", idStr, null,
             null);
       }
-      RetryCache.setState(cacheEntry, success);
     }
     getEditLog().logSync();
   }
@@ -8385,14 +8280,12 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     return results;
   }
 
-  public void addCachePool(CachePoolInfo req) throws IOException {
+  public void addCachePool(CachePoolInfo req, boolean logRetryCache)
+      throws IOException {
     checkOperation(OperationCategory.WRITE);
     final FSPermissionChecker pc = isPermissionEnabled ?
         getPermissionChecker() : null;
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
     writeLock();
     boolean success = false;
     String poolInfoStr = null;
@@ -8407,27 +8300,24 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       }
       CachePoolInfo info = cacheManager.addCachePool(req);
       poolInfoStr = info.toString();
-      getEditLog().logAddCachePool(info, cacheEntry != null);
+      getEditLog().logAddCachePool(info, logRetryCache);
       success = true;
     } finally {
       writeUnlock();
       if (isAuditEnabled() && isExternalInvocation()) {
         logAuditEvent(success, "addCachePool", poolInfoStr, null, null);
       }
-      RetryCache.setState(cacheEntry, success);
     }
     
     getEditLog().logSync();
   }
 
-  public void modifyCachePool(CachePoolInfo req) throws IOException {
+  public void modifyCachePool(CachePoolInfo req, boolean logRetryCache)
+      throws IOException {
     checkOperation(OperationCategory.WRITE);
     final FSPermissionChecker pc =
         isPermissionEnabled ? getPermissionChecker() : null;
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
     writeLock();
     boolean success = false;
     try {
@@ -8440,7 +8330,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
         pc.checkSuperuserPrivilege();
       }
       cacheManager.modifyCachePool(req);
-      getEditLog().logModifyCachePool(req, cacheEntry != null);
+      getEditLog().logModifyCachePool(req, logRetryCache);
       success = true;
     } finally {
       writeUnlock();
@@ -8448,20 +8338,17 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
         String poolNameStr = "{poolName: " + req.getPoolName() + "}";
         logAuditEvent(success, "modifyCachePool", poolNameStr, req.toString(), null);
       }
-      RetryCache.setState(cacheEntry, success);
     }
 
     getEditLog().logSync();
   }
 
-  public void removeCachePool(String cachePoolName) throws IOException {
+  public void removeCachePool(String cachePoolName, boolean logRetryCache)
+      throws IOException {
     checkOperation(OperationCategory.WRITE);
     final FSPermissionChecker pc =
         isPermissionEnabled ? getPermissionChecker() : null;
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
     writeLock();
     boolean success = false;
     try {
@@ -8474,7 +8361,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
         pc.checkSuperuserPrivilege();
       }
       cacheManager.removeCachePool(cachePoolName);
-      getEditLog().logRemoveCachePool(cachePoolName, cacheEntry != null);
+      getEditLog().logRemoveCachePool(cachePoolName, logRetryCache);
       success = true;
     } finally {
       writeUnlock();
@@ -8482,7 +8369,6 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
         String poolNameStr = "{poolName: " + cachePoolName + "}";
         logAuditEvent(success, "removeCachePool", poolNameStr, null, null);
       }
-      RetryCache.setState(cacheEntry, success);
     }
     
     getEditLog().logSync();
@@ -8675,15 +8561,10 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @throws UnresolvedLinkException if the path can't be resolved.
    * @throws SafeModeException       if the Namenode is in safe mode.
    */
-  void createEncryptionZone(final String src, final String keyName)
+  void createEncryptionZone(final String src, final String keyName,
+                            boolean logRetryCache)
     throws IOException, UnresolvedLinkException,
       SafeModeException, AccessControlException {
-    final CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
-
-    boolean success = false;
     try {
       if (provider == null) {
         throw new IOException(
@@ -8709,13 +8590,10 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
       // If the provider supports pool for EDEKs, this will fill in the pool
       generateEncryptedDataEncryptionKey(keyName);
       createEncryptionZoneInt(src, metadata.getCipher(),
-          keyName, cacheEntry != null);
+          keyName, logRetryCache);
-      success = true;
     } catch (AccessControlException e) {
       logAuditEvent(false, "createEncryptionZone", src);
       throw e;
-    } finally {
-      RetryCache.setState(cacheEntry, success);
     }
   }
 
@@ -8820,22 +8698,15 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @throws UnresolvedLinkException
    * @throws IOException
    */
-  void setXAttr(String src, XAttr xAttr, EnumSet<XAttrSetFlag> flag)
+  void setXAttr(String src, XAttr xAttr, EnumSet<XAttrSetFlag> flag,
+                boolean logRetryCache)
       throws AccessControlException, SafeModeException,
       UnresolvedLinkException, IOException {
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
-    boolean success = false;
     try {
-      setXAttrInt(src, xAttr, flag, cacheEntry != null);
+      setXAttrInt(src, xAttr, flag, logRetryCache);
-      success = true;
     } catch (AccessControlException e) {
       logAuditEvent(false, "setXAttr", src);
       throw e;
-    } finally {
-      RetryCache.setState(cacheEntry, success);
     }
   }
   
@@ -8985,20 +8856,13 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
    * @throws UnresolvedLinkException
    * @throws IOException
    */
-  void removeXAttr(String src, XAttr xAttr) throws IOException {
+  void removeXAttr(String src, XAttr xAttr, boolean logRetryCache)
-    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+      throws IOException {
-    if (cacheEntry != null && cacheEntry.isSuccess()) {
-      return; // Return previous response
-    }
-    boolean success = false;
     try {
-      removeXAttrInt(src, xAttr, cacheEntry != null);
+      removeXAttrInt(src, xAttr, logRetryCache);
-      success = true;
     } catch (AccessControlException e) {
       logAuditEvent(false, "removeXAttr", src);
       throw e;
-    } finally {
-      RetryCache.setState(cacheEntry, success);
     }
   }
 

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

@@ -138,6 +138,9 @@ import org.apache.hadoop.io.EnumSetWritable;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.ipc.ProtobufRpcEngine;
 import org.apache.hadoop.ipc.RPC;
+import org.apache.hadoop.ipc.RetryCache;
+import org.apache.hadoop.ipc.RetryCache.CacheEntry;
+import org.apache.hadoop.ipc.RetryCache.CacheEntryWithPayload;
 import org.apache.hadoop.ipc.Server;
 import org.apache.hadoop.ipc.WritableRpcEngine;
 import org.apache.hadoop.ipc.RefreshRegistry;
@@ -166,7 +169,6 @@ import org.apache.hadoop.tools.proto.GetUserMappingsProtocolProtos.GetUserMappin
 import org.apache.hadoop.tools.protocolPB.GetUserMappingsProtocolPB;
 import org.apache.hadoop.tools.protocolPB.GetUserMappingsProtocolServerSideTranslatorPB;
 import org.apache.hadoop.tracing.SpanReceiverInfo;
-import org.apache.hadoop.tracing.TraceAdminPB;
 import org.apache.hadoop.tracing.TraceAdminPB.TraceAdminService;
 import org.apache.hadoop.tracing.TraceAdminProtocolPB;
 import org.apache.hadoop.tracing.TraceAdminProtocolServerSideTranslatorPB;
@@ -191,6 +193,8 @@ class NameNodeRpcServer implements NamenodeProtocols {
   protected final NameNode nn;
   private final NameNodeMetrics metrics;
 
+  private final RetryCache retryCache;
+
   private final boolean serviceAuthEnabled;
 
   /** The RPC server that listens to requests from DataNodes */
@@ -207,6 +211,7 @@ class NameNodeRpcServer implements NamenodeProtocols {
       throws IOException {
     this.nn = nn;
     this.namesystem = nn.getNamesystem();
+    this.retryCache = namesystem.getRetryCache();
     this.metrics = NameNode.getNameNodeMetrics();
     
     int handlerCount = 
@@ -510,14 +515,36 @@ class NameNodeRpcServer implements NamenodeProtocols {
     verifyRequest(registration);
     if(!nn.isRole(NamenodeRole.NAMENODE))
       throw new IOException("Only an ACTIVE node can invoke startCheckpoint.");
-    return namesystem.startCheckpoint(registration, nn.setRegistration());
+
+    CacheEntryWithPayload cacheEntry = RetryCache.waitForCompletion(retryCache,
+      null);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return (NamenodeCommand) cacheEntry.getPayload();
+    }
+    NamenodeCommand ret = null;
+    try {
+      ret = namesystem.startCheckpoint(registration, nn.setRegistration());
+    } finally {
+      RetryCache.setState(cacheEntry, ret != null, ret);
+    }
+    return ret;
   }
 
   @Override // NamenodeProtocol
   public void endCheckpoint(NamenodeRegistration registration,
                             CheckpointSignature sig) throws IOException {
     namesystem.checkSuperuserPrivilege();
-    namesystem.endCheckpoint(registration, sig);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+    try {
+      namesystem.endCheckpoint(registration, sig);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override // ClientProtocol
@@ -562,19 +589,32 @@ class NameNodeRpcServer implements NamenodeProtocols {
     String clientMachine = getClientMachine();
     if (stateChangeLog.isDebugEnabled()) {
       stateChangeLog.debug("*DIR* NameNode.create: file "
-                         +src+" for "+clientName+" at "+clientMachine);
+          +src+" for "+clientName+" at "+clientMachine);
     }
     if (!checkPathLength(src)) {
       throw new IOException("create: Pathname too long.  Limit "
           + MAX_PATH_LENGTH + " characters, " + MAX_PATH_DEPTH + " levels.");
     }
-    HdfsFileStatus fileStatus = namesystem.startFile(src, new PermissionStatus(
+
-        getRemoteUser().getShortUserName(), null, masked),
+    CacheEntryWithPayload cacheEntry = RetryCache.waitForCompletion(retryCache, null);
-        clientName, clientMachine, flag.get(), createParent, replication,
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
-        blockSize, supportedVersions);
+      return (HdfsFileStatus) cacheEntry.getPayload();
+    }
+
+    HdfsFileStatus status = null;
+    try {
+      PermissionStatus perm = new PermissionStatus(getRemoteUser()
+          .getShortUserName(), null, masked);
+      status = namesystem.startFile(src, perm, clientName, clientMachine,
+          flag.get(), createParent, replication, blockSize, supportedVersions,
+          cacheEntry != null);
+    } finally {
+      RetryCache.setState(cacheEntry, status != null, status);
+    }
+
     metrics.incrFilesCreated();
     metrics.incrCreateFileOps();
-    return fileStatus;
+    return status;
   }
 
   @Override // ClientProtocol
@@ -585,7 +625,20 @@ class NameNodeRpcServer implements NamenodeProtocols {
       stateChangeLog.debug("*DIR* NameNode.append: file "
           +src+" for "+clientName+" at "+clientMachine);
     }
-    LocatedBlock info = namesystem.appendFile(src, clientName, clientMachine);
+    CacheEntryWithPayload cacheEntry = RetryCache.waitForCompletion(retryCache, null);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return (LocatedBlock) cacheEntry.getPayload();
+    }
+
+    LocatedBlock info = null;
+    boolean success = false;
+    try {
+      info = namesystem.appendFile(src, clientName, clientMachine,
+          cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success, info);
+    }
     metrics.incrFilesAppended();
     return info;
   }
@@ -727,7 +780,19 @@ class NameNodeRpcServer implements NamenodeProtocols {
   public void updatePipeline(String clientName, ExtendedBlock oldBlock,
       ExtendedBlock newBlock, DatanodeID[] newNodes, String[] newStorageIDs)
       throws IOException {
-    namesystem.updatePipeline(clientName, oldBlock, newBlock, newNodes, newStorageIDs);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+
+    boolean success = false;
+    try {
+      namesystem.updatePipeline(clientName, oldBlock, newBlock, newNodes,
+          newStorageIDs, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
   
   @Override // DatanodeProtocol
@@ -756,7 +821,18 @@ class NameNodeRpcServer implements NamenodeProtocols {
       throw new IOException("rename: Pathname too long.  Limit "
           + MAX_PATH_LENGTH + " characters, " + MAX_PATH_DEPTH + " levels.");
     }
-    boolean ret = namesystem.renameTo(src, dst);
+
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return true; // Return previous response
+    }
+
+    boolean ret = false;
+    try {
+      ret = namesystem.renameTo(src, dst, cacheEntry != null);
+    } finally {
+      RetryCache.setState(cacheEntry, ret);
+    }
     if (ret) {
       metrics.incrFilesRenamed();
     }
@@ -765,7 +841,18 @@ class NameNodeRpcServer implements NamenodeProtocols {
   
   @Override // ClientProtocol
   public void concat(String trg, String[] src) throws IOException {
-    namesystem.concat(trg, src);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+
+    try {
+      namesystem.concat(trg, src, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
   
   @Override // ClientProtocol
@@ -778,7 +865,17 @@ class NameNodeRpcServer implements NamenodeProtocols {
       throw new IOException("rename: Pathname too long.  Limit "
           + MAX_PATH_LENGTH + " characters, " + MAX_PATH_DEPTH + " levels.");
     }
-    namesystem.renameTo(src, dst, options);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+    try {
+      namesystem.renameTo(src, dst, cacheEntry != null, options);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
     metrics.incrFilesRenamed();
   }
 
@@ -788,7 +885,17 @@ class NameNodeRpcServer implements NamenodeProtocols {
       stateChangeLog.debug("*DIR* Namenode.delete: src=" + src
           + ", recursive=" + recursive);
     }
-    boolean ret = namesystem.delete(src, recursive);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return true; // Return previous response
+    }
+
+    boolean ret = false;
+    try {
+      ret = namesystem.delete(src, recursive, cacheEntry != null);
+    } finally {
+      RetryCache.setState(cacheEntry, ret);
+    }
     if (ret) 
       metrics.incrDeleteFileOps();
     return ret;
@@ -904,7 +1011,17 @@ class NameNodeRpcServer implements NamenodeProtocols {
 
   @Override // ClientProtocol
   public void saveNamespace() throws IOException {
-    namesystem.saveNamespace();
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+    try {
+      namesystem.saveNamespace();
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
   
   @Override // ClientProtocol
@@ -1025,6 +1142,11 @@ class NameNodeRpcServer implements NamenodeProtocols {
   @Override // ClientProtocol
   public void createSymlink(String target, String link, FsPermission dirPerms,
       boolean createParent) throws IOException {
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+
     metrics.incrCreateSymlinkOps();
     /* We enforce the MAX_PATH_LENGTH limit even though a symlink target 
      * URI may refer to a non-HDFS file system. 
@@ -1038,8 +1160,17 @@ class NameNodeRpcServer implements NamenodeProtocols {
       throw new IOException("Invalid symlink target");
     }
     final UserGroupInformation ugi = getRemoteUser();
-    namesystem.createSymlink(target, link,
+
-      new PermissionStatus(ugi.getShortUserName(), null, dirPerms), createParent);
+    boolean success = false;
+    try {
+      PermissionStatus perm = new PermissionStatus(ugi.getShortUserName(),
+          null, dirPerms);
+      namesystem.createSymlink(target, link, perm, createParent,
+          cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override // ClientProtocol
@@ -1326,15 +1457,38 @@ class NameNodeRpcServer implements NamenodeProtocols {
       throw new IOException("createSnapshot: Pathname too long.  Limit "
           + MAX_PATH_LENGTH + " characters, " + MAX_PATH_DEPTH + " levels.");
     }
+    CacheEntryWithPayload cacheEntry = RetryCache.waitForCompletion(retryCache,
+      null);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return (String) cacheEntry.getPayload();
+    }
+
     metrics.incrCreateSnapshotOps();
-    return namesystem.createSnapshot(snapshotRoot, snapshotName);
+    String ret = null;
+    try {
+      ret = namesystem.createSnapshot(snapshotRoot, snapshotName,
+          cacheEntry != null);
+    } finally {
+      RetryCache.setState(cacheEntry, ret != null, ret);
+    }
+    return ret;
   }
   
   @Override
   public void deleteSnapshot(String snapshotRoot, String snapshotName)
       throws IOException {
     metrics.incrDeleteSnapshotOps();
-    namesystem.deleteSnapshot(snapshotRoot, snapshotName);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+    try {
+      namesystem.deleteSnapshot(snapshotRoot, snapshotName, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override
@@ -1358,7 +1512,18 @@ class NameNodeRpcServer implements NamenodeProtocols {
       throw new IOException("The new snapshot name is null or empty.");
     }
     metrics.incrRenameSnapshotOps();
-    namesystem.renameSnapshot(snapshotRoot, snapshotOldName, snapshotNewName);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+    try {
+      namesystem.renameSnapshot(snapshotRoot, snapshotOldName,
+          snapshotNewName, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override // Client Protocol
@@ -1382,18 +1547,53 @@ class NameNodeRpcServer implements NamenodeProtocols {
   @Override
   public long addCacheDirective(
       CacheDirectiveInfo path, EnumSet<CacheFlag> flags) throws IOException {
-    return namesystem.addCacheDirective(path, flags);
+    CacheEntryWithPayload cacheEntry = RetryCache.waitForCompletion
+      (retryCache, null);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return (Long) cacheEntry.getPayload();
+    }
+
+    boolean success = false;
+    long ret = 0;
+    try {
+      ret = namesystem.addCacheDirective(path, flags, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success, ret);
+    }
+    return ret;
   }
 
   @Override
   public void modifyCacheDirective(
       CacheDirectiveInfo directive, EnumSet<CacheFlag> flags) throws IOException {
-    namesystem.modifyCacheDirective(directive, flags);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return;
+    }
+
+    boolean success = false;
+    try {
+      namesystem.modifyCacheDirective(directive, flags, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override
   public void removeCacheDirective(long id) throws IOException {
-    namesystem.removeCacheDirective(id);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return;
+    }
+    boolean success = false;
+    try {
+      namesystem.removeCacheDirective(id, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override
@@ -1407,17 +1607,47 @@ class NameNodeRpcServer implements NamenodeProtocols {
 
   @Override
   public void addCachePool(CachePoolInfo info) throws IOException {
-    namesystem.addCachePool(info);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+    try {
+      namesystem.addCachePool(info, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override
   public void modifyCachePool(CachePoolInfo info) throws IOException {
-    namesystem.modifyCachePool(info);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+    try {
+      namesystem.modifyCachePool(info, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override
   public void removeCachePool(String cachePoolName) throws IOException {
-    namesystem.removeCachePool(cachePoolName);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return;
+    }
+    boolean success = false;
+    try {
+      namesystem.removeCachePool(cachePoolName, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override
@@ -1461,7 +1691,17 @@ class NameNodeRpcServer implements NamenodeProtocols {
   @Override
   public void createEncryptionZone(String src, String keyName)
     throws IOException {
-    namesystem.createEncryptionZone(src, keyName);
+    final CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return;
+    }
+    boolean success = false;
+    try {
+      namesystem.createEncryptionZone(src, keyName, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override
@@ -1479,7 +1719,17 @@ class NameNodeRpcServer implements NamenodeProtocols {
   @Override
   public void setXAttr(String src, XAttr xAttr, EnumSet<XAttrSetFlag> flag)
       throws IOException {
-    namesystem.setXAttr(src, xAttr, flag);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+    try {
+      namesystem.setXAttr(src, xAttr, flag, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
   
   @Override
@@ -1495,7 +1745,17 @@ class NameNodeRpcServer implements NamenodeProtocols {
   
   @Override
   public void removeXAttr(String src, XAttr xAttr) throws IOException {
-    namesystem.removeXAttr(src, xAttr);
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
+      return; // Return previous response
+    }
+    boolean success = false;
+    try {
+      namesystem.removeXAttr(src, xAttr, cacheEntry != null);
+      success = true;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
+    }
   }
 
   @Override

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

@@ -19,15 +19,11 @@ package org.apache.hadoop.hdfs.server.namenode;
 
 import static org.junit.Assert.*;
 
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.EnumSet;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.CreateFlag;
-import org.apache.hadoop.fs.FileAlreadyExistsException;
-import org.apache.hadoop.fs.ParentNotDirectoryException;
-import org.apache.hadoop.fs.UnresolvedLinkException;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.fs.permission.PermissionStatus;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
@@ -37,16 +33,14 @@ import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
 import org.apache.hadoop.net.StaticMapping;
-import org.apache.hadoop.security.AccessControlException;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 
 public class TestDefaultBlockPlacementPolicy {
 
-  private Configuration conf;
+  private static final short REPLICATION_FACTOR = (short) 3;
-  private final short REPLICATION_FACTOR = (short) 3;
+  private static final int DEFAULT_BLOCK_SIZE = 1024;
-  private final int DEFAULT_BLOCK_SIZE = 1024;
   private MiniDFSCluster cluster = null;
   private NamenodeProtocols nameNodeRpc = null;
   private FSNamesystem namesystem = null;
@@ -55,13 +49,12 @@ public class TestDefaultBlockPlacementPolicy {
   @Before
   public void setup() throws IOException {
     StaticMapping.resetMap();
-    conf = new HdfsConfiguration();
+    Configuration conf = new HdfsConfiguration();
     final String[] racks = { "/RACK0", "/RACK0", "/RACK2", "/RACK3", "/RACK2" };
     final String[] hosts = { "/host0", "/host1", "/host2", "/host3", "/host4" };
 
     conf.setLong(DFSConfigKeys.DFS_BLOCK_SIZE_KEY, DEFAULT_BLOCK_SIZE);
-    conf.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY,
+    conf.setInt(DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_KEY, DEFAULT_BLOCK_SIZE / 2);
-        DEFAULT_BLOCK_SIZE / 2);
     cluster = new MiniDFSCluster.Builder(conf).numDataNodes(5).racks(racks)
         .hosts(hosts).build();
     cluster.waitActive();
@@ -104,17 +97,14 @@ public class TestDefaultBlockPlacementPolicy {
   }
 
   private void testPlacement(String clientMachine,
-      String clientRack) throws AccessControlException,
+      String clientRack) throws IOException {
-      SafeModeException, FileAlreadyExistsException, UnresolvedLinkException,
-      FileNotFoundException, ParentNotDirectoryException, IOException,
-      NotReplicatedYetException {
     // write 5 files and check whether all times block placed
     for (int i = 0; i < 5; i++) {
       String src = "/test-" + i;
       // Create the file with client machine
       HdfsFileStatus fileStatus = namesystem.startFile(src, perm,
           clientMachine, clientMachine, EnumSet.of(CreateFlag.CREATE), true,
-          REPLICATION_FACTOR, DEFAULT_BLOCK_SIZE, null);
+          REPLICATION_FACTOR, DEFAULT_BLOCK_SIZE, null, false);
       LocatedBlock locatedBlock = nameNodeRpc.addBlock(src, clientMachine,
           null, null, fileStatus.getFileId(), null);
 

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

@@ -191,7 +191,7 @@ public class TestFsLimits {
     lazyInitFSDirectory();
     Class<?> generated = null;
     try {
-      fs.renameTo(src, dst, new Rename[] { });
+      fs.renameTo(src, dst, false, new Rename[] { });
     } catch (Throwable e) {
       generated = e.getClass();
     }
@@ -204,7 +204,7 @@ public class TestFsLimits {
     lazyInitFSDirectory();
     Class<?> generated = null;
     try {
-      fs.renameTo(src, dst);
+      fs.renameTo(src, dst, false);
     } catch (Throwable e) {
       generated = e.getClass();
     }