Progress-report RPCs should wait for the RPC to complete before sending another 
progress report
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                 Key: HADOOP-1235
                 URL: https://issues.apache.org/jira/browse/HADOOP-1235
             Project: Hadoop
          Issue Type: Bug
          Components: dfs, mapred
            Reporter: Devaraj Das
            Priority: Minor


The Progress-report IPCs don't wait for an invoked IPC to complete before 
sending another progress report. Since in the IPC server, handlers execute as 
threads, an old progress report might overwrite the status sent by a newer 
progress report. Making the progress report IPC methods return a boolean or 
something, and having the clients wait for the response to a progress report 
before sending the next one, should handle the issue.

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