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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12163) Ozone: Reduce MiniOzoneCluster handler thread count
Date Fri, 04 Aug 2017 18:35:00 GMT

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

Xiaoyu Yao updated HDFS-12163:
------------------------------
          Resolution: Fixed
        Hadoop Flags: Reviewed
       Fix Version/s: HDFS-7240
    Target Version/s: HDFS-7240
              Status: Resolved  (was: Patch Available)

Thanks [~cheersyang] for the contribution and all for the discussions. I've commit the patch
to the feature branch. 

> Ozone: Reduce MiniOzoneCluster handler thread count
> ---------------------------------------------------
>
>                 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
>             Fix For: HDFS-7240
>
>         Attachments: HDFS-12163-HDFS-7240.001.patch, HDFS-12163-HDFS-7240.002.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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