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https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16094984#comment-16094984
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Tsz Wo Nicholas Sze commented on HDFS-12163:
--------------------------------------------
Running using mvn gives similar results. This problem is not specific to
IntelliJ.
- mvn test with 1-datanode cluster-
| (distributed,1) | init | 5 |
| (distributed,1) | MiniOzoneCluster | 401 |
| (distributed,1) | shutdown | 53 |
| (distributed,1) | sleep | 26 |
| (GRPC,1) | init | 26 |
| (GRPC,1) | MiniOzoneCluster | 421 |
| (GRPC,1) | createRatisCluster | 431 |
| (GRPC,1) | shutdown | 84 |
| (GRPC,1) | sleep | 65 |
| (local,1) | init | 65 |
| (local,1) | MiniOzoneCluster | 461 |
| (local,1) | shutdown | 113 |
| (local,1) | sleep | 104 |
| (NETTY,1) | init | 104 |
| (NETTY,1) | MiniOzoneCluster | 504 |
| (NETTY,1) | createRatisCluster | 526 |
| (NETTY,1) | shutdown | 178 |
| (NETTY,1) | sleep | 162 |
- mvn test with 5-datanode clusters
| (distributed,5) | init | 5 |
| (distributed,5) | MiniOzoneCluster | 592 |
| (distributed,5) | shutdown | 212 |
| (distributed,5) | sleep | 93 |
| (GRPC,5) | init | 93 |
| (GRPC,5) | MiniOzoneCluster | 692 |
| (GRPC,5) | createRatisCluster | 739 |
| (GRPC,5) | shutdown | 359 |
| (GRPC,5) | sleep | 289 |
| (local,5) | init | 289 |
| (local,5) | MiniOzoneCluster | 902 |
| (local,5) | shutdown | 523 |
| (local,5) | sleep | 501 |
| (NETTY,5) | init | 501 |
| (NETTY,5) | MiniOzoneCluster | 1152 |
| (NETTY,5) | createRatisCluster | 1280 |
| (NETTY,5) | shutdown | 903 |
| (NETTY,5) | sleep | 845 |
> 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
> Assignee: Weiwei Yang
> 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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