[jira] [Created] (HDFS-11280) Allow WebHDFSClient to reuse HTTP connections (HTTP Keep-Alive)

["Zheng Shao (JIRA)" <ji...@apache.org>]

Zheng Shao created HDFS-11280:
---------------------------------

             Summary: 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: 3.0.0-alpha1, 2.6.5, 2.7.3
            Reporter: Zheng Shao
            Priority: Minor


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 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





--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-help@hadoop.apache.org