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https://issues.apache.org/jira/browse/HDFS-11234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu updated HDFS-11234:
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Assignee: Suresh Bahuguna
> 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
>
> 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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