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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7421) Move processing of postponed over-replicated blocks to a background task
Date Fri, 21 Nov 2014 09:26:34 GMT
Aaron T. Myers created HDFS-7421:
------------------------------------

             Summary: Move processing of postponed over-replicated blocks to a background
task
                 Key: HDFS-7421
                 URL: https://issues.apache.org/jira/browse/HDFS-7421
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: ha, namenode
    Affects Versions: 2.6.0
            Reporter: Aaron T. Myers
            Assignee: Aaron T. Myers


In an HA environment, we postpone sending block invalidates to DNs until all DNs holding a
given block have done at least one block report to the NN after it became active. When that
first block report after becoming active does occur, we attempt to reprocess all postponed
misreplicated blocks inline with the block report RPC. In the case where there are many postponed
misreplicated blocks, this can cause block report RPCs to take an inordinately long time to
complete, sometimes on the order of minutes, which has the potential to tie up RPC handlers,
block incoming RPCs, etc. There's no need to hurriedly process all postponed misreplicated
blocks so that we can quickly send invalidate commands back to DNs, so let's move this processing
outside of the RPC handler context and into a background thread.



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