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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13529) Procedure v2 - WAL Improvements
Date Wed, 22 Apr 2015 10:50:59 GMT
Matteo Bertozzi created HBASE-13529:

             Summary: Procedure v2 - WAL Improvements
                 Key: HBASE-13529
                 URL: https://issues.apache.org/jira/browse/HBASE-13529
             Project: HBase
          Issue Type: Sub-task
          Components: proc-v2
    Affects Versions: 2.0.0, 1.1.0
            Reporter: Matteo Bertozzi
            Assignee: Matteo Bertozzi
            Priority: Minor
             Fix For: 2.0.0, 1.1.0
         Attachments: HBASE-13529-v0.patch

from the discussion in HBASE-12439 the wal was resulting slow.
 * there is an error around the awake of the slotCond.await(), causing more wait then necessary
 * ArrayBlockingQueue is dog slow, replace it with ConcurrentLinkedQueue
 * roll the wal only if reaches a threshold (conf ops) to amortize the cost
 * hsync() is used by default, when the normal wal is using just hflush() make it tunable
via conf

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