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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
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Todd Lipcon commented on HBASE-2467:
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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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