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https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108392#comment-16108392
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Weiwei Yang commented on HDFS-12163:
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Hi [~anu]
Here is the result after set 20 handler for KSM,
| (distributed,1) | init | 6 |
| (distributed,1) | MiniOzoneCluster | 222 |
| (distributed,1) | shutdown | 80 |
| (distributed,1) | sleep | 13 |
I will overwrite this value to 20 in {{MiniOzoneCluster}} since 200 is not
necessary for testing.
> 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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