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https://issues.apache.org/jira/browse/HDFS-13702?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-13702:
---
Resolution: Fixed
Fix Version/s: 3.0.4
3.1.1
3.2.0
Status: Resolved (was: Patch Available)
+1 LGTM as well, committing on behalf of Todd to trunk, branch-3.1, branch-3.0.
Thanks for the patch Todd, and reviews from Stack and Steve. Let's take the
continued tracing discussion to common-dev.
> Remove HTrace hooks from DFSClient to reduce CPU usage
> --
>
> 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
> Fix For: 3.2.0, 3.1.1, 3.0.4
>
> 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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