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From "Jiandan Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-7168) The size of dataQueue and ackQueue in DataStreamer has no limit when writer thread is interrupted
Date Thu, 07 Sep 2017 02:31:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-7168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jiandan Yang  updated YARN-7168:
--------------------------------
    Description: 
In our cluster, when found NodeManager frequently FullGC when decommissioning NodeManager,
and we found the biggest object is dataQueue of DataStreamer, it has almost 6w DFSPacket,
and every DFSPacket is about 64k, as shown below.
The root reason is that the size of dataQueue and ackQueue in DataStreamer has no limit when
writer thread is interrupted. I know NodeManager may stop writing when interruped, but DFSOutputStream
also could do something to avoid fullgc

!mat.jpg|memory_analysis!


  was:
In our cluster, when found NodeManager frequently FullGC when decommissioning NodeManager,
and we found the biggest object is dataQueue of DataStreamer, it has almost 6w DFSPacket,
and every DFSPacket is about 64k.
!mat.jpg|memory_analysis!
The root reason is that the size of dataQueue and ackQueue in DataStreamer has no limit when
writer thread is interrupted. I know NodeManager may stop writing when interruped, but DFSOutputStream
also could do something to avoid fullgc



> The size of dataQueue and ackQueue in DataStreamer has no limit when writer thread is
interrupted
> -------------------------------------------------------------------------------------------------
>
>                 Key: YARN-7168
>                 URL: https://issues.apache.org/jira/browse/YARN-7168
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: client
>            Reporter: Jiandan Yang 
>         Attachments: mat.jpg
>
>
> In our cluster, when found NodeManager frequently FullGC when decommissioning NodeManager,
and we found the biggest object is dataQueue of DataStreamer, it has almost 6w DFSPacket,
and every DFSPacket is about 64k, as shown below.
> The root reason is that the size of dataQueue and ackQueue in DataStreamer has no limit
when writer thread is interrupted. I know NodeManager may stop writing when interruped, but
DFSOutputStream also could do something to avoid fullgc
> !mat.jpg|memory_analysis!



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