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https://issues.apache.org/jira/browse/HBASE-2467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926664#action_12926664
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Todd Lipcon commented on HBASE-2467:
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We can't commit this to hbase until HDFS-895 is committed to HDFS. If you run
this HBase patch without HDFS-895 you lose group commit and everything goes
much slower. HDFS-895 needs to go into both trunk and 20-append
> Concurrent flushers in HLog sync using HDFS-895
> -----------------------------------------------
>
> Key: HBASE-2467
> URL: https://issues.apache.org/jira/browse/HBASE-2467
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 0.90.0
>
> Attachments: HBASE-2467-v2.patch, HBASE-2467-v3.patch, 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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