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Posted to hdfs-dev@hadoop.apache.org by "Chris Nauroth (JIRA)" <ji...@apache.org> on 2013/07/15 22:56:48 UTC

[jira] [Created] (HDFS-4996) ClientProtocol#metaSave can be made idempotent by overwriting the output file instead of appending to it

Chris Nauroth created HDFS-4996:
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             Summary: ClientProtocol#metaSave can be made idempotent by overwriting the output file instead of appending to it
                 Key: HDFS-4996
                 URL: https://issues.apache.org/jira/browse/HDFS-4996
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode
    Affects Versions: 3.0.0, 2.1.0-beta
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth
            Priority: Minor


{{ClientProtocol#metaSave}} opens its output file for append.  This prevents the operation from being idempotent, because retries can cause unpredictable side effects (single copy of the output vs. multiple copies).  As discussed on HDFS-4974, the operation could be made idempotent by changing this to open the file for overwrite instead of append.

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