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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2691) HA: Tests and fixes for pipeline targets and replica recovery
Date Thu, 15 Dec 2011 22:43:30 GMT
HA: Tests and fixes for pipeline targets and replica recovery
-------------------------------------------------------------

                 Key: HDFS-2691
                 URL: https://issues.apache.org/jira/browse/HDFS-2691
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ha
    Affects Versions: HA branch (HDFS-1623)
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon
            Priority: Critical


Currently there are some TODOs around pipeline/recovery code in the HA branch. For example,
commitBlockSynchronization only gets sent to the active NN which may have failed over by that
point. So, we need to write some tests here and figure out what the correct behavior is.

Another related area is the treatment of targets in the pipeline. When a pipeline is created,
the active NN adds the "expected locations" to the BlockInfoUnderConstruction, but the DN
identifiers aren't logged with the OP_ADD. So after a failover, the BlockInfoUnderConstruction
will have no targets and I imagine replica recovery would probably trigger some issues.

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