DataBlockScanner (via periodic verification) could be improved to check for 
corrupt block length
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                 Key: HADOOP-3314
                 URL: https://issues.apache.org/jira/browse/HADOOP-3314
             Project: Hadoop Core
          Issue Type: Improvement
          Components: dfs
         Environment: All
            Reporter: lohit vijayarenu


DataBlockScanner should also check for truncated blocks and report them as 
corrupt block to the NN

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