HADOOP-9576. Changed NetUtils#wrapException to throw EOFException instead of wrapping it as IOException. Contributed by Steve Loughran

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

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetUtils.java

@@ -17,6 +17,7 @@
  */
 package org.apache.hadoop.net;
 
+import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -759,6 +760,13 @@ public static IOException wrapException(final String destHost,
               + " failed on socket timeout exception: " + exception
               + ";"
               + see("NoRouteToHost"));
+    } else if (exception instanceof EOFException) {
+      return wrapWithMessage(exception,
+          "End of File Exception between "
+              + getHostDetailsAsString(destHost,  destPort, localHost)
+              + ": " + exception
+              + ";"
+              + see("EOFException"));
     }
     else {
       return (IOException) new IOException("Failed on local exception: "

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestNetUtils.java

@@ -19,6 +19,7 @@
 
 import static org.junit.Assert.*;
 
+import java.io.EOFException;
 import java.io.IOException;
 import java.net.BindException;
 import java.net.ConnectException;
@@ -256,6 +257,17 @@ public void testWrapUnknownHostException() throws Throwable {
     assertInException(wrapped, "/UnknownHost");
   }
   
+  @Test
+  public void testWrapEOFException() throws Throwable {
+    IOException e = new EOFException("eof");
+    IOException wrapped = verifyExceptionClass(e, EOFException.class);
+    assertInException(wrapped, "eof");
+    assertWikified(wrapped);
+    assertInException(wrapped, "localhost");
+    assertRemoteDetailsIncluded(wrapped);
+    assertInException(wrapped, "/EOFException");
+  }
+  
   @Test
   public void testGetConnectAddress() throws IOException {
     NetUtils.addStaticResolution("host", "127.0.0.1");