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https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16094067#comment-16094067
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Weiwei Yang commented on HDFS-12163:
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Very interesting, I observed a number of leaks as well in the past. Most recent
one I am working on is HDFS-12098, that problem was caused by thread leak too.
[~szetszwo] are you working on a fix? If not, I can look into this problem this
weekend.
> Ozone: MiniOzoneCluster uses 400+ threads
> -----------------------------------------
>
> Key: HDFS-12163
> URL: https://issues.apache.org/jira/browse/HDFS-12163
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ozone, test
> Reporter: Tsz Wo Nicholas Sze
> Attachments: TestOzoneThreadCount20170719.patch
>
>
> 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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