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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12163) Ozone: MiniOzoneCluster uses 400+ threads
Date Thu, 20 Jul 2017 17:08:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16094984#comment-16094984
] 

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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