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https://issues.apache.org/jira/browse/HDFS-16115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17375401#comment-17375401
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Daniel Ma commented on HDFS-16115:
----------------------------------
[~brahmareddy]
[~ayush]
Pls help to review this patch.
> Asynchronously handle BPServiceActor command mechanism may result in
> BPServiceActor never fails even CommandProcessingThread is closed with fatal
> error.
> --------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-16115
> URL: https://issues.apache.org/jira/browse/HDFS-16115
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.3.1
> Reporter: Daniel Ma
> Priority: Critical
> Fix For: 3.3.1
>
> Attachments: 0001-HDFS-16115.patch
>
>
> It is an improvement issue. Actually the issue has two sub issues:
> 1- BPServerActor thread handle commands from NameNode in aysnchronous way (
> CommandProcessThread handle commands ), so if there are any exception or
> errors happens in thread CommandProcessthread resulting the thread fails and
> stop, of which BPServiceActor cannot aware and still keep put commands from
> namenode into queues waiting to be handled by CommandProcessThread, actually
> CommandProcessThread was dead already.
> 2-the second sub issue is based on the first one, if CommandProcessThread
> fails owing to some non-fatal error like "can not create native thread" which
> is caused by too many threads existed on the node, this kind of problem
> should be given much torlerance instead of simply shudown the thread and
> never recover automatically, because the non-fatal eror mention above may
> recover soon by itself,
> currently, Datanode BPServiceActor cannot turn to normal even when the
> non-fatal error was eliminated.
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