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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HBASE-1213) Investigate Locking & Contention in the Write Path
Date Thu, 30 Apr 2009 22:51:30 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jonathan Gray reassigned HBASE-1213:

    Assignee: stack

> Investigate Locking & Contention in the Write Path
> --------------------------------------------------
>                 Key: HBASE-1213
>                 URL: https://issues.apache.org/jira/browse/HBASE-1213
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.19.0
>            Reporter: Ben Maurer
>            Assignee: stack
>             Fix For: 0.20.0
> When doing a large number of bulk updates from different clients, I noticed that there
was a high level of lock contention for stuff like locking the HLog. It seems that each thread
acquires the lock for a single BatchUpdate, releases the lock then another thread owns the
lock before the initial writer gets to the next update. Having the threads bounce around may
lead to suboptimal performance.
> Should be benchmarked & maybe changed to have less context switching.

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