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Date: Thu, 22 Nov 2007 19:24:43 -0800 (PST)
From: "Jim Kellerman (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-2139) [hbase] Increase parallelism in
 region servers
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    [ https://issues.apache.org/jira/browse/HADOOP-2139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12544919 ] 

Jim Kellerman commented on HADOOP-2139:
---------------------------------------

Build 1143 demonstrated both HADOOP-2263 and HADOOP-2251

> [hbase] Increase parallelism in region servers
> ----------------------------------------------
>
>                 Key: HADOOP-2139
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2139
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: contrib/hbase
>    Affects Versions: 0.16.0
>            Reporter: Jim Kellerman
>            Assignee: Jim Kellerman
>             Fix For: 0.16.0
>
>         Attachments: locking.xls, operation-compatibility.jpg, patch.txt, patch.txt, patch.txt, patch.txt, patch.txt, patch.txt, patch.txt, patch.txt
>
>
> There are a number of paths in the region server which block against one another including:
> - log rolling
> - cache flushes
> - region splitting
> - updates
> - scanners
> Investigate which can proceed in parallel and mechanisms for making some operations that currently do not run in parallel.

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