Adding a patch that was missed in previous svn port of HDFS-630 change.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security@1164722 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -63,6 +63,9 @@ Release 0.20.205.0 - unreleased
     HDFS-988. Fix bug where savenameSpace can corrupt edits log.
     (Nicolas Spiegelberg via dhruba)
 
+    HDFS-1054. remove sleep before retry for allocating a block.
+    (Todd Lipcon via dhruba)
+
   IMPROVEMENTS
 
     MAPREDUCE-2187. Reporter sends progress during sort/merge. (Anupam Seth via

src/hdfs/org/apache/hadoop/hdfs/DFSClient.java

@@ -3054,19 +3054,12 @@ public class DFSClient implements FSConstants, java.io.Closeable {
           namenode.abandonBlock(block, src, clientName);
 
           if (errorIndex < nodes.length) {
-            LOG.debug("Excluding datanode " + nodes[errorIndex]);
+            LOG.info("Excluding datanode " + nodes[errorIndex]);
             excludedNodes.add(nodes[errorIndex]);
           }
 
           // Connection failed.  Let's wait a little bit and retry
           retry = true;
-          try {
-            if (System.currentTimeMillis() - startTime > 5000) {
-              LOG.info("Waiting to find target node: " + nodes[0].getName());
-            }
-            Thread.sleep(6000);
-          } catch (InterruptedException iex) {
-          }
         }
       } while (retry && --count >= 0);
 

src/test/org/apache/hadoop/hdfs/TestDFSClientExcludedNodes.java

@@ -0,0 +1,55 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+import junit.*;
+import static junit.framework.Assert.fail;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+
+
+/**
+ * These tests make sure that DFSClient retries fetching data from DFS
+ * properly in case of errors.
+ */
+public class TestDFSClientExcludedNodes extends junit.framework.TestCase {
+
+  public void testExcludedNodes() throws IOException {
+    Configuration conf = new Configuration();
+    MiniDFSCluster cluster = new MiniDFSCluster(conf, 3, true, null);
+    FileSystem fs = cluster.getFileSystem();
+    Path filePath = new Path("/testExcludedNodes");
+
+    // kill a datanode
+    cluster.stopDataNode(AppendTestUtil.nextInt(3));
+    OutputStream out = fs.create(filePath, true, 4096);
+    out.write(20);
+
+    try {
+      out.close();
+    } catch (Exception e) {
+      fail("DataNode failure should not result in a block abort: \n" + e.getMessage());
+    }
+  }
+  
+}