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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2014/05/13 21:47:15 UTC

[jira] [Created] (HBASE-11160) Undo append waiting on region edit/sequence id update

stack created HBASE-11160:
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             Summary: Undo append waiting on region edit/sequence id update
                 Key: HBASE-11160
                 URL: https://issues.apache.org/jira/browse/HBASE-11160
             Project: HBase
          Issue Type: Sub-task
          Components: wal
    Affects Versions: 0.99.0
            Reporter: stack
            Assignee: stack
             Fix For: 0.99.0


HBASE--11135 changed append to wait on the update of the edit/sequence id.  This slows writes by a significant amount (50% slower?).  [~jeffreyz] is going to look at updating MVCC inside in the ring buffer consumer thread just after the region edit/sequence id update.  If that works, then we can undo having append wait on the sequence id update and get some of our speedup back.  Marking this 0.99 and blocker so we don't forget about it (Undoing the wait is just a case of removing the few lines of latch code in FSWALEdit).



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