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Posted to hdfs-issues@hadoop.apache.org by "Mingliang Liu (JIRA)" <ji...@apache.org> on 2016/07/12 23:02:21 UTC
[jira] [Assigned] (HDFS-10326) Disable setting tcp socket
send/receive buffers for write pipelines
[ https://issues.apache.org/jira/browse/HDFS-10326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mingliang Liu reassigned HDFS-10326:
------------------------------------
Assignee: Mingliang Liu (was: Daryn Sharp)
> Disable setting tcp socket send/receive buffers for write pipelines
> -------------------------------------------------------------------
>
> Key: HDFS-10326
> URL: https://issues.apache.org/jira/browse/HDFS-10326
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, hdfs
> Affects Versions: 2.6.0
> Reporter: Daryn Sharp
> Assignee: Mingliang Liu
> Attachments: HDFS-10326.000.patch
>
>
> The DataStreamer and the Datanode use a hardcoded DEFAULT_DATA_SOCKET_SIZE=128K for the send and receive buffers of a write pipeline. Explicitly setting tcp buffer sizes disables tcp stack auto-tuning.
> The hardcoded value will saturate a 1Gb with 1ms RTT. 105Mbs at 10ms. Paltry 11Mbs over a 100ms long haul. 10Gb networks are underutilized.
> There should either be a configuration to completely disable setting the buffers, or the the setReceiveBuffer and setSendBuffer should be removed entirely.
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