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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10932) Ozone : fix XceiverClient slow shutdown
Date Thu, 29 Sep 2016 23:02:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15534352#comment-15534352
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Anu Engineer commented on HDFS-10932:
-------------------------------------

+1 , pending jenkins. I think we should have this patch until we have a XceiverClientFactory
class that can manage the caching.


> Ozone : fix XceiverClient slow shutdown
> ---------------------------------------
>
>                 Key: HDFS-10932
>                 URL: https://issues.apache.org/jira/browse/HDFS-10932
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>         Attachments: HDFS-10932.001.patch
>
>
> Currently {{XceiverClient}} is the underlying entity of {{DistributedStorageHandler.newKeyWriter()}}
and {{DistributedStorageHandler.newKeyReader()}}  for making call to container for read/write.
When {{XceiverClient}} gets closed, {{group.shutdownGracefully()}} gets called, which is an
asynchronous call. 
> A problem is that this asynchronous call has default quiet period of 2 seconds before
it actually shutdown, so if we have a burst of read/write calls, we would end up having threads
created faster than they got terminated, reaching system limit at some point.
> Ideally, this needs to be fixed with cached clients instead of creating new thread each
time. This JIRA only tries to give a temporary fix for the time being.
> Thanks [~anu] for the offline discussion.



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