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https://issues.apache.org/jira/browse/HDFS-11234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18048693#comment-18048693
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ASF GitHub Bot commented on HDFS-11234:
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github-actions[bot] commented on PR #172:
URL: https://github.com/apache/hadoop/pull/172#issuecomment-3704266566
We're closing this stale PR because it has been open for 100 days with no
activity. This isn't a judgement on the merit of the PR in any way. It's just a
way of keeping the PR queue manageable.
If you feel like this was a mistake, or you would like to continue working
on it, please feel free to re-open it and ask for a committer to remove the
stale tag and review again.
Thanks all for your contribution.
> distcp performance is suboptimal for high bandwidth/high latency setups
> -----------------------------------------------------------------------
>
> Key: HDFS-11234
> URL: https://issues.apache.org/jira/browse/HDFS-11234
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 2.7.1
> Reporter: Suresh Bahuguna
> Assignee: Suresh Bahuguna
> Priority: Major
>
> Because distcp uses tcp socket with buffer size set to 128K, for a setup
> which has very high bandwidth but also a very high latency, the throughput is
> quite poor. This is because tcp stops sending more data till the time it gets
> the ACKs. By not setting the socket size and letting linux kernel manage the
> socket, we should be able to get optimal performance.
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