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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2263) Make DFSClient report bad blocks more quickly
Date Wed, 17 Aug 2011 00:09:27 GMT
Make DFSClient report bad blocks more quickly
---------------------------------------------

                 Key: HDFS-2263
                 URL: https://issues.apache.org/jira/browse/HDFS-2263
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs client
    Affects Versions: 0.20.2
            Reporter: Aaron T. Myers


In certain circumstances the DFSClient may detect a block as being bad without reporting it
promptly to the NN.

If when reading a file a client finds an invalid checksum of a block, it immediately reports
that bad block to the NN. If when serving up a block a DN finds a truncated block, it reports
this to the client, but the client merely adds that DN to the list of dead nodes and moves
on to trying another DN, without reporting this to the NN.

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