svn merge -c 1520126 merging from trunk to branch-2 to fix HADOOP-9932.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1520127 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -179,6 +179,8 @@ Release 2.1.1-beta - UNRELEASED
     HADOOP-9924. FileUtil.createJarWithClassPath() does not generate relative
     classpath correctly. (Shanyu Zhao via ivanmi)
 
+    HADOOP-9932. Improper synchronization in RetryCache. (kihwal)
+
 Release 2.1.0-beta - 2013-08-22
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/RetryCache.java

@@ -76,6 +76,12 @@ public class RetryCache {
       this.expirationTime = expirationTime;
     }
 
+    CacheEntry(byte[] clientId, int callId, long expirationTime,
+        boolean success) {
+      this(clientId, callId, expirationTime);
+      this.state = success ? SUCCESS : FAILED;
+    }
+
     private static int hashCode(long value) {
       return (int)(value ^ (value >>> 32));
     }
@@ -147,6 +153,12 @@ public class RetryCache {
       this.payload = payload;
     }
 
+    CacheEntryWithPayload(byte[] clientId, int callId, Object payload,
+        long expirationTime, boolean success) {
+     super(clientId, callId, expirationTime, success);
+     this.payload = payload;
+   }
+
     /** Override equals to avoid findbugs warnings */
     @Override
     public boolean equals(Object obj) {
@@ -253,18 +265,20 @@ public class RetryCache {
    */
   public void addCacheEntry(byte[] clientId, int callId) {
     CacheEntry newEntry = new CacheEntry(clientId, callId, System.nanoTime()
-        + expirationTime);
-    newEntry.completed(true);
-    set.put(newEntry);
+        + expirationTime, true);
+    synchronized(this) {
+      set.put(newEntry);
+    }
   }
   
   public void addCacheEntryWithPayload(byte[] clientId, int callId,
       Object payload) {
-    CacheEntry newEntry = new CacheEntryWithPayload(clientId, callId, payload,
-        System.nanoTime() + expirationTime);
     // since the entry is loaded from editlog, we can assume it succeeded.    
-    newEntry.completed(true);
-    set.put(newEntry);
+    CacheEntry newEntry = new CacheEntryWithPayload(clientId, callId, payload,
+        System.nanoTime() + expirationTime, true);
+    synchronized(this) {
+      set.put(newEntry);
+    }
   }
 
   private static CacheEntry newEntry(long expirationTime) {