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https://issues.apache.org/jira/browse/HBASE-2467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931217#action_12931217
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Todd Lipcon commented on HBASE-2467:
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The only potential issue I'm aware of is this possible case where HBase will
call hflush() on a closed stream... maybe that problem is gone in the most
recent iteration of this patch. JD, have you seen that come up on recent
versions? I think we can look carefully through the HBase side to see if this
race still exists -- it was happening when the log rolled in between the append
and hflush. We may need an rwlock to protect log rolling.
> 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: Blocker
> Fix For: 0.90.0
>
> Attachments: HBASE-2467-v2.patch, HBASE-2467-v3.patch,
> HBASE-2467-v4.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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