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Posted to hdfs-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2015/02/23 17:37:13 UTC

[jira] [Resolved] (HDFS-6967) DNs may OOM under high webhdfs load

     [ 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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