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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2467) Concurrent flushers in HLog sync using HDFS-895
Date Tue, 04 May 2010 18:24:11 GMT

    [ 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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