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https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo Nicholas Sze updated HDFS-12163:
---------------------------------------
    Description: 
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 a 
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.

  was:
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 a 
1-datanode .

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.


> 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
>
> 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 a 
> 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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