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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12163) Ozone: MiniOzoneCluster uses 400+ threads
Date Tue, 01 Aug 2017 06:29:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Weiwei Yang updated HDFS-12163:
-------------------------------
    Status: Patch Available  (was: Open)

> Ozone: MiniOzoneCluster uses 400+ threads
> -----------------------------------------
>
>                 Key: HDFS-12163
>                 URL: https://issues.apache.org/jira/browse/HDFS-12163
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone, test
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Weiwei Yang
>         Attachments: HDFS-12163-HDFS-7240.001.patch, most_used_threads.png, TestOzoneThreadCount20170719.patch,
thread_dump.png
>
>
> 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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