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From "Stephen Yuan Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13529) Procedure v2 - WAL Improvements
Date Thu, 23 Apr 2015 06:24:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14508530#comment-14508530
] 

Stephen Yuan Jiang commented on HBASE-13529:
--------------------------------------------

+1 - LGTM 

> 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: Blocker
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: HBASE-13529-v0.patch, HBASE-13529-v1.patch, HBASE-13529-v2.patch,
ProcedureStoreTest.java
>
>
> 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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