Vinay created HDFS-5257:
---------------------------

             Summary: addBlock() retry should return LocatedBlock with 
locations else client will get AIOBE
                 Key: HDFS-5257
                 URL: https://issues.apache.org/jira/browse/HDFS-5257
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client, namenode
    Affects Versions: 2.1.1-beta
            Reporter: Vinay
            Assignee: Vinay
            Priority: Critical


{{addBlock()}} call retry should return the LocatedBlock with locations if the 
block was created in previous call and failover/restart of namenode happened.

otherwise client will get {{ArrayIndexOutOfBoundsException}} while creating the 
block and write will fail.

{noformat}java.lang.ArrayIndexOutOfBoundsException: 0
        at 
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1118)
        at 
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1078)
        at 
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:511){noformat}

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