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From "Eric Payne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7224) Allow reuse of NN connections via webhdfs
Date Thu, 30 Oct 2014 19:28:34 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Payne updated HDFS-7224:
-----------------------------
    Attachment: HDFS-7224.v1.201410301923.txt

> Allow reuse of NN connections via webhdfs
> -----------------------------------------
>
>                 Key: HDFS-7224
>                 URL: https://issues.apache.org/jira/browse/HDFS-7224
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>    Affects Versions: 2.5.0
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>         Attachments: HDFS-7224.v1.201410301923.txt
>
>
> In very large clusters, the webhdfs client could get bind exceptions because it runs
out of ephemeral
> ports. This could happen when using webhdfs to talk to the NN in order to do list globbing
of a
> huge amount of files.
> WebHdfsFileSystem#jsonParse gets the input/error stream from the connection,
> but never closes the stream. Since it's not closed, the JVM thinks the stream may still
> be transferring data, so the next time through this code, it has to get a new connection
> rather than reusing an existing one. 
> The lack of connection reuse has poor latency and adds too much overhead to the NN.



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