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https://issues.apache.org/jira/browse/HBASE-3504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990690#comment-12990690
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Todd Lipcon commented on HBASE-3504:
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Makes me pretty nervous, though, to have something called sequenceID that isn't
written sequentially... like you I can't think of any exact issues yet, but I
bet there's something subtle and nefarious.
What is the actual performance improvement to be gained measured by a benchmark?
> HLog performance improvement
> ----------------------------
>
> Key: HBASE-3504
> URL: https://issues.apache.org/jira/browse/HBASE-3504
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> The HLog.updateLock protects the rolling of logs with concurrent writes to
> the HDFS log file. This is a scalability bottleneck for a workload that
> comprises mostly of counter-increments.
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