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https://issues.apache.org/jira/browse/HDFS-13702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16524270#comment-16524270
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Sean Busbey commented on HDFS-13702:
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{quote}
I think we should commit this patch, +1, and then we can file another to review
how to move forward with tracing in light of recent developments in htrace
project; i.e. purge all other htrace references, look into alternatives, etc.
{quote}
please be sure to link the follow-on jira to this one. probably should get a
DISCUSS thread on common-dev@
> HTrace hooks taking 10-15% CPU in DFS client when disabled
> ----------------------------------------------------------
>
> Key: HDFS-13702
> URL: https://issues.apache.org/jira/browse/HDFS-13702
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: performance
> Affects Versions: 3.0.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Major
> Attachments: hdfs-13702.patch, hdfs-13702.patch, hdfs-13702.patch
>
>
> I am seeing DFSClient.newReaderTraceScope take ~15% CPU in a teravalidate
> workload even when HTrace is disabled. This is because it stringifies several
> integers. We should avoid all allocation and stringification when htrace is
> disabled.
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