Revert "HDFS-13388. RequestHedgingProxyProvider calls multiple configured NNs 
all the time. Contributed by Jinglun."

This reverts commit 7e692425d538454abf69b07f6e8fd686a1171ac8.


Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/20472bdf
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/20472bdf
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/20472bdf

Branch: refs/heads/YARN-8200
Commit: 20472bdfd2e8f084e106a8c732498e1601018d0c
Parents: f055a53
Author: Inigo Goiri <inigo...@apache.org>
Authored: Thu Apr 12 08:44:17 2018 -0700
Committer: Inigo Goiri <inigo...@apache.org>
Committed: Thu Apr 12 08:44:17 2018 -0700

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 .../ha/RequestHedgingProxyProvider.java         |  3 --
 .../ha/TestRequestHedgingProxyProvider.java     | 34 --------------------
 2 files changed, 37 deletions(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/20472bdf/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java
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diff --git 
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java
 
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java
index f34adce..010e9e5 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.java
@@ -78,9 +78,6 @@ public class RequestHedgingProxyProvider<T> extends
     public Object
     invoke(Object proxy, final Method method, final Object[] args)
             throws Throwable {
-      if (currentUsedProxy != null) {
-        return method.invoke(currentUsedProxy.proxy, args);
-      }
       Map<Future<Object>, ProxyInfo<T>> proxyMap = new HashMap<>();
       int numAttempts = 0;
 

http://git-wip-us.apache.org/repos/asf/hadoop/blob/20472bdf/hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestRequestHedgingProxyProvider.java
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diff --git 
a/hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestRequestHedgingProxyProvider.java
 
b/hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestRequestHedgingProxyProvider.java
index a8a5c6e..65fbbf8 100644
--- 
a/hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestRequestHedgingProxyProvider.java
+++ 
b/hadoop-hdfs-project/hadoop-hdfs-client/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestRequestHedgingProxyProvider.java
@@ -42,13 +42,10 @@ import org.junit.Assert;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;
-import static org.junit.Assert.assertEquals;
 import org.mockito.Matchers;
 import org.mockito.Mockito;
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;
-import static org.mockito.Mockito.when;
-import static org.mockito.Mockito.mock;
 
 import com.google.common.collect.Lists;
 
@@ -102,37 +99,6 @@ public class TestRequestHedgingProxyProvider {
   }
 
   @Test
-  public void testRequestNNAfterOneSuccess() throws Exception {
-    final AtomicInteger count = new AtomicInteger(0);
-    final ClientProtocol goodMock = mock(ClientProtocol.class);
-    when(goodMock.getStats()).thenAnswer(new Answer<long[]>() {
-      @Override
-      public long[] answer(InvocationOnMock invocation) throws Throwable {
-        count.incrementAndGet();
-        Thread.sleep(1000);
-        return new long[]{1};
-      }
-    });
-    final ClientProtocol badMock = mock(ClientProtocol.class);
-    when(badMock.getStats()).thenAnswer(new Answer<long[]>() {
-      @Override
-      public long[] answer(InvocationOnMock invocation) throws Throwable {
-        count.incrementAndGet();
-        throw new IOException("Bad mock !!");
-      }
-    });
-
-    RequestHedgingProxyProvider<ClientProtocol> provider =
-        new RequestHedgingProxyProvider<>(conf, nnUri, ClientProtocol.class,
-            createFactory(badMock, goodMock, goodMock, badMock));
-    ClientProtocol proxy = provider.getProxy().proxy;
-    proxy.getStats();
-    assertEquals(2, count.get());
-    proxy.getStats();
-    assertEquals(3, count.get());
-  }
-
-  @Test
   public void testHedgingWhenOneIsSlow() throws Exception {
     final ClientProtocol goodMock = Mockito.mock(ClientProtocol.class);
     Mockito.when(goodMock.getStats()).thenAnswer(new Answer<long[]>() {


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