HADOOP-10630. Possible race condition in RetryInvocationHandler. Contributed by Jing Zhao.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1599366 13f79535-47bb-0310-9956-ffa450edef68

Author: Jing9

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

@@ -527,6 +527,8 @@ Release 2.5.0 - UNRELEASED
     HADOOP-10638. Updating hadoop-daemon.sh to work as expected when nfs is
     started as a privileged user. (Manikandan Narayanaswamy via atm)
 
+    HADOOP-10630. Possible race condition in RetryInvocationHandler. (jing9)
+
 Release 2.4.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/RetryInvocationHandler.java

@@ -36,7 +36,6 @@
 import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.ipc.RpcConstants;
 import org.apache.hadoop.ipc.RpcInvocationHandler;
-import org.apache.hadoop.util.ThreadUtil;
 
 import com.google.common.annotations.VisibleForTesting;
 
@@ -160,11 +159,11 @@ public Object invoke(Object proxy, Method method, Object[] args)
               if (invocationAttemptFailoverCount == proxyProviderFailoverCount) {
                 proxyProvider.performFailover(currentProxy.proxy);
                 proxyProviderFailoverCount++;
-                currentProxy = proxyProvider.getProxy();
               } else {
                 LOG.warn("A failover has occurred since the start of this method"
                     + " invocation attempt.");
               }
+              currentProxy = proxyProvider.getProxy();
             }
             invocationFailoverCount++;
           }