title: Exception in createBlockOutputStream when copying data into HDFS
body: <p>I am getting the below warning messages while copying the data into HDFS. I've 6 node cluster running. Every time during copy it ignores the two nodes and displays the below warning messages.</p>
  
  <pre><code>    INFO hdfs.DFSClient: Exception in createBlockOutputStream
  java.io.IOException: Bad connect ack with firstBadLink as 192.168.226.136:50010
          at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1116)
          at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1039)
          at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:487)
  13/11/04 05:02:15 INFO hdfs.DFSClient: Abandoning BP-603619794-127.0.0.1-1376359904614:blk_-7294477166306619719_1917
  13/11/04 05:02:15 INFO hdfs.DFSClient: Excluding datanode 192.168.226.136:50010
  </code></pre>
  
  <p>Datanode logs</p>
  
  <pre><code>2014-02-07 04:22:01,953 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:                     IOException in offerService
            java.io.IOException: Failed on local exception: java.io.IOException: Connection  reset by peer; Host Details : local host is: "datanode4/192.168.226.136"; destination host is: "namenode":8020;
          at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:763)
          at org.apache.hadoop.ipc.Client.call(Client.java:1235)
          at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:202)
          at sun.proxy.$Proxy10.sendHeartbeat(Unknown Source)
          at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:616)
          at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:164)
          at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:83)
          at sun.proxy.$Proxy10.sendHeartbeat(Unknown Source)
          at org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.sendHeartbeat(DatanodeProtocolClientSideTranslatorPB.java:170)
          at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.sendHeartBeat(BPServiceActor.java:441)
          at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:521)
          at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:673)
          at java.lang.Thread.run(Thread.java:679)
  Caused by: java.io.IOException: Connection reset by peer
          at sun.nio.ch.FileDispatcher.read0(Native Method)
          at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
          at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:251)
          at sun.nio.ch.IOUtil.read(IOUtil.java:224)
          at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:254)
          at org.apache.hadoop.net.SocketInputStream$Reader.performIO(SocketInputStream.java:56)
          at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:143)
          at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:156)
          at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:129)
          at java.io.FilterInputStream.read(FilterInputStream.java:133)
          at java.io.FilterInputStream.read(FilterInputStream.java:133)
          at org.apache.hadoop.ipc.Client$Connection$PingInputStream.read(Client.java:411)
          at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
          at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
          at java.io.FilterInputStream.read(FilterInputStream.java:83)
          at com.google.protobuf.AbstractMessageLite$Builder.mergeDelimitedFrom(AbstractMessageLite.java:276)
          at com.google.protobuf.AbstractMessage$Builder.mergeDelimitedFrom(AbstractMessage.java:760)
          at com.google.protobuf.AbstractMessageLite$Builder.mergeDelimitedFrom(AbstractMessageLite.java:288)
          at com.google.protobuf.AbstractMessage$Builder.mergeDelimitedFrom(AbstractMessage.java:752)
          at org.apache.hadoop.ipc.protobuf.RpcPayloadHeaderProtos$RpcResponseHeaderProto.parseDelimitedFrom(RpcPayloadHeaderProtos.java:985)
          at org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:941)
          at org.apache.hadoop.ipc.Client$Connection.run(Client.java:839)
  2014-02-07 04:22:04,780 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:05,783 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:06,785 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:07,788 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:08,791 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:09,794 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 5 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:10,796 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:11,798 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 7 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:12,802 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:13,813 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: namenode/192.168.226.129:8020. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  2014-02-07 04:22:13,818 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: IOException in offerService
  java.net.ConnectException: Call From datanode4/192.168.226.136 to namenode:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
  </code></pre>
  
  <p>I tried doing SSH from datanode to namenode it works.
  Can anyone please me this one.</p>
  
  <p>Please let me know if you need any other details.</p>