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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-6967) DNs may OOM under high webhdfs load
Date Mon, 23 Feb 2015 16:37:13 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee resolved HDFS-6967.
------------------------------
    Resolution: Won't Fix

The DN webhdfs server has been re-implemeted using netty.

> DNs may OOM under high webhdfs load
> -----------------------------------
>
>                 Key: HDFS-6967
>                 URL: https://issues.apache.org/jira/browse/HDFS-6967
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode, webhdfs
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Eric Payne
>
> Webhdfs uses jetty.  The size of the request thread pool is limited, but jetty will accept
and queue infinite connections.  Every queued connection is "heavy" with buffers, etc.  Unlike
data streamer connections, thousands of webhdfs connections will quickly OOM a DN.  The accepted
requests must be bounded and excess clients rejected so they retry on a new DN.



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