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https://issues.apache.org/jira/browse/HDFS-9259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14977044#comment-14977044
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Hudson commented on HDFS-9259:
------------------------------
FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #604 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/604/])
HDFS-9259. Make SO_SNDBUF size configurable at DFSClient side for hdfs (mingma:
rev aa09880ab85f3c35c12373976e7b03f3140b65c8)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/DfsClientConf.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DataStreamer.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSClientSocketSize.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsClientConfigKeys.java
> 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
> Assignee: Mingliang Liu
> Fix For: 2.8.0
>
> Attachments: HDFS-9259.000.patch, HDFS-9259.001.patch
>
>
> 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 ran "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 by
> making SendBufferSize configurable at DFSClient side. Cc: [~cmccabe] [~He
> Tianyi] [~kanaka] [~vinayrpet].
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