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https://issues.apache.org/jira/browse/HDFS-11280?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Shao updated HDFS-11280:
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Attachment: HDFS-11280.for.2.7.and.below.patch
> Allow WebHDFSClient to reuse HTTP connections (HTTP Keep-Alive)
> ---------------------------------------------------------------
>
> Key: HDFS-11280
> URL: https://issues.apache.org/jira/browse/HDFS-11280
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 2.7.3, 2.6.5, 3.0.0-alpha1
> Reporter: Zheng Shao
> Priority: Minor
> Attachments: HDFS-11280.for.2.7.and.below.patch
>
>
> WebHDFSClient calls "conn.disconnect()", which disconnects from the NameNode.
> When we use webhdfs as the source in distcp, this used up all ephemeral
> ports since all closed connections continue to occupy the port with TIME_WAIT
> status for some time.
> According to http://tinyurl.com/java7-http-keepalive, we should call
> conn.getInputStream().close() instead to make sure the connection is kept
> alive. This will get rid of the ephemeral port problem.
> Reference:
> 2.7 and below:
> https://github.com/apache/hadoop/blob/branch-2.6/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java#L743
> 2.8 and above:
> https://github.com/apache/hadoop/blob/branch-2.8/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java#L898
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