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From "Keith Turner (JIRA)" <>
Subject [jira] [Resolved] (ACCUMULO-509) default walog copy/sort uses replication of 1
Date Tue, 29 May 2012 18:36:24 GMT


Keith Turner resolved ACCUMULO-509.

       Resolution: Fixed
    Fix Version/s: 1.5.0
         Assignee: Keith Turner  (was: Eric Newton)
> default walog copy/sort uses replication of 1
> ---------------------------------------------
>                 Key: ACCUMULO-509
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: logger
>         Environment: medium size cluster
>            Reporter: Eric Newton
>            Assignee: Keith Turner
>            Priority: Minor
>             Fix For: 1.5.0, 1.4.1
> During recovery, the logger copied/sorted a recovery walog to hdfs.  The copy was ok,
but there was a checksum error when replaying the data.  The system did not recover without
manual intervention.  The work-around was to find the datanode serving the back block, and
stop it.  Then I removed the bad recovery file and restarted the master.  The copy/sort took
place again, and used a different datanode.  Recovery proceeded successfully.
> We need to use a higher replication and/or a more sophisticated approach to verifying
and restarting recoveries.

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