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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-10094) Add batching to HLogPerformanceEvaluation
Date Sat, 07 Dec 2013 13:52:36 GMT

     [ https://issues.apache.org/jira/browse/HBASE-10094?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

stack updated HBASE-10094:

    Attachment: addendum.0.96.txt

My backport broke the 0.96 build.  Here is fix I applied.

> Add batching to HLogPerformanceEvaluation
> -----------------------------------------
>                 Key: HBASE-10094
>                 URL: https://issues.apache.org/jira/browse/HBASE-10094
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Performance, wal
>            Reporter: stack
>            Assignee: Himanshu Vashishtha
>             Fix For: 0.98.0, 0.96.1, 0.99.0
>         Attachments: 10094v2.txt, addendum.0.96.txt
> As Himanshu points out in the the parent issue, HLogPE is using an unorthodox API appending
edits to the WAL; it is using an API that is meant for tests only that does an append immediately
followed by a sync call.
> In normal deploy, WAL appends are done as a bunch of appends followed by a sync on the
tail of the transaction -- not a sync per append.
> This issue is about changing HLogPE to use append and then sync.  It also adds an argument
so you can specifying batching of a set of appends before  the sync is called.  The latter
lets HLogPE mimic multi puts that use the minibatch... which appends, appends, appends.. and
then syncs.
> Assigning to Himanshu for review.

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