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https://issues.apache.org/jira/browse/HDFS-9259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14961091#comment-14961091
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Mingliang Liu commented on HDFS-9259:
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Hi [~mingma], can I work on this, if we reach consensus on the issue itself?
> Make SO_SNDBUF size configurable at DFSClient side for hdfs write scenario
> --------------------------------------------------------------------------
>
> Key: HDFS-9259
> URL: https://issues.apache.org/jira/browse/HDFS-9259
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ming Ma
>
> We recently found that cross-DC hdfs write could be really slow. Further
> investigation identified that is due to SendBufferSize and ReceiveBufferSize
> used for hdfs write. The test is to do "hadoop -fs -copyFromLocal" of a 256MB
> file across DC with different SendBufferSize and ReceiveBufferSize values.
> The results showed that c much faster than b; b is faster than a.
> a. SendBufferSize=128k, ReceiveBufferSize=128k (hdfs default setting).
> b. SendBufferSize=128K, ReceiveBufferSize=not set(TCP auto tuning).
> c. SendBufferSize=not set, ReceiveBufferSize=not set(TCP auto tuning for both)
> HDFS-8829 has enabled scenario b. We would like to enable scenario c to make
> SendBufferSize configurable at DFSClient side. Cc: [~cmccabe] [~He Tianyi]
> [~kanaka] [~vinayrpet].
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