YARN-4288. Fixed RMProxy to retry on IOException from local host. Contributed by Junping Du

(cherry picked from commit c41699965e)

Conflicts:

	hadoop-yarn-project/CHANGES.txt

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

@@ -134,7 +134,17 @@ public class RetryPolicies {
       Map<Class<? extends Exception>, RetryPolicy> exceptionToPolicyMap) {
     return new RemoteExceptionDependentRetry(defaultPolicy, exceptionToPolicyMap);
   }
-  
+
+  /**
+   * A retry policy for exceptions other than RemoteException.
+   */
+  public static final RetryPolicy retryOtherThanRemoteException(
+      RetryPolicy defaultPolicy,
+      Map<Class<? extends Exception>, RetryPolicy> exceptionToPolicyMap) {
+    return new OtherThanRemoteExceptionDependentRetry(defaultPolicy,
+        exceptionToPolicyMap);
+  }
+
   public static final RetryPolicy failoverOnNetworkException(int maxFailovers) {
     return failoverOnNetworkException(TRY_ONCE_THEN_FAIL, maxFailovers);
   }
@@ -483,7 +493,37 @@ public class RetryPolicies {
       return policy.shouldRetry(e, retries, failovers, isIdempotentOrAtMostOnce);
     }
   }
-  
+
+  static class OtherThanRemoteExceptionDependentRetry implements RetryPolicy {
+
+    private RetryPolicy defaultPolicy;
+    private Map<Class<? extends Exception>, RetryPolicy> exceptionToPolicyMap;
+
+    public OtherThanRemoteExceptionDependentRetry(RetryPolicy defaultPolicy,
+        Map<Class<? extends Exception>,
+        RetryPolicy> exceptionToPolicyMap) {
+      this.defaultPolicy = defaultPolicy;
+      this.exceptionToPolicyMap = exceptionToPolicyMap;
+    }
+
+    @Override
+    public RetryAction shouldRetry(Exception e, int retries, int failovers,
+        boolean isIdempotentOrAtMostOnce) throws Exception {
+      RetryPolicy policy = null;
+      // ignore Remote Exception
+      if (e instanceof RemoteException) {
+        // do nothing
+      } else {
+        policy = exceptionToPolicyMap.get(e.getClass());
+      }
+      if (policy == null) {
+        policy = defaultPolicy;
+      }
+      return policy.shouldRetry(
+          e, retries, failovers, isIdempotentOrAtMostOnce);
+    }
+  }
+
   static class ExponentialBackoffRetry extends RetryLimited {
     
     public ExponentialBackoffRetry(

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/retry/TestRetryProxy.java

@@ -22,12 +22,14 @@ import static org.apache.hadoop.io.retry.RetryPolicies.RETRY_FOREVER;
 import static org.apache.hadoop.io.retry.RetryPolicies.TRY_ONCE_THEN_FAIL;
 import static org.apache.hadoop.io.retry.RetryPolicies.retryByException;
 import static org.apache.hadoop.io.retry.RetryPolicies.retryByRemoteException;
+import static org.apache.hadoop.io.retry.RetryPolicies.retryOtherThanRemoteException;
 import static org.apache.hadoop.io.retry.RetryPolicies.retryUpToMaximumCountWithFixedSleep;
 import static org.apache.hadoop.io.retry.RetryPolicies.retryUpToMaximumCountWithProportionalSleep;
 import static org.apache.hadoop.io.retry.RetryPolicies.retryUpToMaximumTimeWithFixedSleep;
 import static org.apache.hadoop.io.retry.RetryPolicies.exponentialBackoffRetry;
 import static org.junit.Assert.*;
 
+import java.io.IOException;
 import java.util.Collections;
 import java.util.Map;
 import java.util.concurrent.Callable;
@@ -202,8 +204,29 @@ public class TestRetryProxy {
     } catch (RemoteException e) {
       // expected
     }
-  }  
-  
+  }
+
+  @Test
+  public void testRetryOtherThanRemoteException() throws Throwable {
+    Map<Class<? extends Exception>, RetryPolicy> exceptionToPolicyMap =
+        Collections.<Class<? extends Exception>, RetryPolicy>singletonMap(
+            IOException.class, RETRY_FOREVER);
+
+    UnreliableInterface unreliable = (UnreliableInterface)
+        RetryProxy.create(UnreliableInterface.class, unreliableImpl,
+            retryOtherThanRemoteException(TRY_ONCE_THEN_FAIL,
+                exceptionToPolicyMap));
+    // should retry with local IOException.
+    unreliable.failsOnceWithIOException();
+    try {
+      // won't get retry on remote exception
+      unreliable.failsOnceWithRemoteException();
+      fail("Should fail");
+    } catch (RemoteException e) {
+      // expected
+    }
+  }
+
   @Test
   public void testRetryInterruptible() throws Throwable {
     final UnreliableInterface unreliable = (UnreliableInterface)

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/retry/UnreliableImplementation.java

@@ -26,6 +26,8 @@ class UnreliableImplementation implements UnreliableInterface {
 
   private int failsOnceInvocationCount,
     failsOnceWithValueInvocationCount,
+    failsOnceIOExceptionInvocationCount,
+    failsOnceRemoteExceptionInvocationCount,
     failsTenTimesInvocationCount,
     succeedsOnceThenFailsCount,
     succeedsOnceThenFailsIdempotentCount,
@@ -89,6 +91,21 @@ class UnreliableImplementation implements UnreliableInterface {
     return true;
   }
 
+  @Override
+  public void failsOnceWithIOException() throws IOException {
+    if (failsOnceIOExceptionInvocationCount++ == 0) {
+      throw new IOException("test exception for failsOnceWithIOException");
+    }
+  }
+
+  @Override
+  public void failsOnceWithRemoteException() throws RemoteException {
+    if (failsOnceRemoteExceptionInvocationCount++ == 0) {
+      throw new RemoteException(IOException.class.getName(),
+          "test exception for failsOnceWithRemoteException");
+    }
+  }
+
   @Override
   public void failsTenTimesThenSucceeds() throws UnreliableException {
     if (failsTenTimesInvocationCount++ < 10) {

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/retry/UnreliableInterface.java

@@ -54,6 +54,9 @@ public interface UnreliableInterface {
   void alwaysFailsWithFatalException() throws FatalException;
   void alwaysFailsWithRemoteFatalException() throws RemoteException;
 
+  void failsOnceWithIOException() throws IOException;
+  void failsOnceWithRemoteException() throws RemoteException;
+
   void failsOnceThenSucceeds() throws UnreliableException;
   boolean failsOnceThenSucceedsWithReturnValue() throws UnreliableException;
 

hadoop-yarn-project/CHANGES.txt

@@ -148,6 +148,9 @@ Release 2.7.3 - UNRELEASED
     YARN-5206. RegistrySecurity includes id:pass in exception text if
     considered invalid (Steve Loughran via jlowe)
 
+    YARN-4288. Fixed RMProxy to retry on IOException from local host.
+    (Junping Du via jianhe)
+
 Release 2.7.2 - 2016-01-25
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/client/RMProxy.java

@@ -249,8 +249,10 @@ public class RMProxy<T> {
     exceptionToPolicyMap.put(ConnectTimeoutException.class, retryPolicy);
     exceptionToPolicyMap.put(RetriableException.class, retryPolicy);
     exceptionToPolicyMap.put(SocketException.class, retryPolicy);
-
-    return RetryPolicies.retryByException(
+    // YARN-4288: local IOException is also possible.
+    exceptionToPolicyMap.put(IOException.class, retryPolicy);
+    // Not retry on remote IO exception.
+    return RetryPolicies.retryOtherThanRemoteException(
         RetryPolicies.TRY_ONCE_THEN_FAIL, exceptionToPolicyMap);
   }
 }