0.20: DNs should interrupt writers at start of recovery
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                 Key: HDFS-1186
                 URL: https://issues.apache.org/jira/browse/HDFS-1186
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node
    Affects Versions: 0.20-append
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Blocker


When block recovery starts (eg due to NN recovering lease) it needs to 
interrupt any writers currently writing to those blocks. Otherwise, an old 
writer (who hasn't realized he lost his lease) can continue to write+sync to 
the blocks, and thus recovery ends up truncating data that has been sync()ed.

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