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From "Suresh Bahuguna (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11234) distcp performance is suboptimal for high bandwidth/high latency setups
Date Mon, 12 Dec 2016 07:46:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15741245#comment-15741245

Suresh Bahuguna commented on HDFS-11234:

Created a pull request https://github.com/apache/hadoop/pull/172 .

> 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
> 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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