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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12163) Ozone: MiniOzoneCluster uses 400+ threads
Date Tue, 01 Aug 2017 04:56:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108378#comment-16108378
] 

Anu Engineer commented on HDFS-12163:
-------------------------------------

 that is a nice find, can you please post the thread count with something like 20 KSM handler
count? Also, we need to file a JIRA to track that issue. We should not launch that many threads
unless we need them, but I am guessing this is part of RPC layer, so we might not want to
change it now.


> Ozone: MiniOzoneCluster uses 400+ threads
> -----------------------------------------
>
>                 Key: HDFS-12163
>                 URL: https://issues.apache.org/jira/browse/HDFS-12163
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone, test
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Weiwei Yang
>         Attachments: most_used_threads.png, TestOzoneThreadCount20170719.patch, thread_dump.png
>
>
> Checked the number of active threads used in MiniOzoneCluster with various settings:
> - Local handlers
> - Distributed handlers
> - Ratis-Netty
> - Ratis-gRPC
> The results are similar for all the settings.  It uses 400+ threads for an 1-datanode
MiniOzoneCluster.
> Moreover, there is a thread leak -- a number of the threads do not shutdown after the
test is finished.  Therefore, when tests run consecutively, the later tests use more threads.
> Will post the details in comments.



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