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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12163) Ozone: MiniOzoneCluster uses 400+ threads
Date Wed, 19 Jul 2017 21:47:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16093848#comment-16093848
] 

Tsz Wo Nicholas Sze commented on HDFS-12163:
--------------------------------------------

5-datanode tests

- Local handlers with 5 datanode
| (local,5) | init | 6 |
| (local,5) | MiniOzoneCluster | 589 |
| (local,5) | shutdown | 209 |
| (local,5) | sleep | 89 |
- Distributed handlers with 5 datanode
| (distributed,5) | init | 6 |
| (distributed,5) | MiniOzoneCluster | 589 |
| (distributed,5) | shutdown | 209 |
| (distributed,5) | sleep | 89 |
- Ratis-Netty handlers with 5 datanode
| (NETTY,5) | init | 6 |
| (NETTY,5) | MiniOzoneCluster | 600 |
| (NETTY,5) | createRatisCluster | 712 |
| (NETTY,5) | shutdown | 332 |
| (NETTY,5) | sleep | 132 |
- Ratis-gRPC handlers with 5 datanode
| (GRPC,5) | init | 6 |
| (GRPC,5) | MiniOzoneCluster | 596 |
| (GRPC,5) | createRatisCluster | 637 |
| (GRPC,5) | shutdown | 257 |
| (GRPC,5) | sleep | 138 |
- All 4 cases above running consecutively.
| (distributed,5) | init | 6 |
| (distributed,5) | MiniOzoneCluster | 589 |
| (distributed,5) | shutdown | 209 |
| (distributed,5) | sleep | 90 |
| (GRPC,5) | init | 90 |
| (GRPC,5) | MiniOzoneCluster | 691 |
| (GRPC,5) | createRatisCluster | 740 |
| (GRPC,5) | shutdown | 360 |
| (GRPC,5) | sleep | 290 |
| (local,5) | init | 290 |
| (local,5) | MiniOzoneCluster | 907 |
| (local,5) | shutdown | 527 |
| (local,5) | sleep | 505 |
| (NETTY,5) | init | 505 |
| (NETTY,5) | MiniOzoneCluster | 1147 |
| (NETTY,5) | createRatisCluster | 1269 |
| (NETTY,5) | shutdown | 890 |
| (NETTY,5) | sleep | 838 |

> 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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