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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2274) [hbase] Excess synchronization introduced by HADOOP-2139 negatively impacts performance
Date Mon, 26 Nov 2007 01:10:43 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jim Kellerman updated HADOOP-2274:
----------------------------------

    Attachment: patch.txt

Make synchronization more fine grained to avoid the "giant lock" syndrome.

> [hbase] Excess synchronization introduced by HADOOP-2139 negatively impacts performance
> ---------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2274
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2274
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.16.0
>            Reporter: Jim Kellerman
>            Assignee: Jim Kellerman
>             Fix For: 0.16.0
>
>         Attachments: patch.txt
>
>
> Phase 2 of HADOOP-2139 introduced more widely scoped synchronization to prevent the concurrent
modification exceptions reported in HADOOP-2163. This has negatively impacted performance.
Investigate synchronization and determine if it can be accomplished at a more fine grained
level.

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