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Message-ID: <6524158.44261272997451923.JavaMail.jira@thor>
Date: Tue, 4 May 2010 14:24:11 -0400 (EDT)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hbase-issues@hadoop.apache.org
Subject: [jira] Commented: (HBASE-2467) Concurrent flushers in HLog sync
 using HDFS-895
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    [ https://issues.apache.org/jira/browse/HBASE-2467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863930#action_12863930 ] 

Todd Lipcon commented on HBASE-2467:
------------------------------------

dhruba: I've been running all of my tests with these patches for the last several weeks and it's been very stable. I haven't done a recent benchmark but it was a substantial gain - close to 2x if I remember correctly. Before this patch gets finally committed I'll do a proper benchmark comparison.

> Concurrent flushers in HLog sync using HDFS-895
> -----------------------------------------------
>
>                 Key: HBASE-2467
>                 URL: https://issues.apache.org/jira/browse/HBASE-2467
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.20.5, 0.21.0
>
>         Attachments: hbase-2467.txt
>
>
> HDFS-895 changes hflush() to be able to run concurrently from multiple threads, where flushes can be concurrent with further writes to the same file.
> We need to rip out/amend the group commit code a bit to take advantage of this.

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