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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12163) Ozone: MiniOzoneCluster uses 400+ threads
Date Tue, 01 Aug 2017 06:59:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108483#comment-16108483
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Yiqun Lin commented on HDFS-12163:
----------------------------------

Thanks [~cheersyang], very nice working!
I just take a quick look of your patch. i have one comment:
{code}
+      // Overwrite handler number to 20, 200 is not necessary for testing.
+      conf.setInt(KSMConfigKeys.OZONE_KSM_HANDLER_COUNT_KEY, 20);
{code}
Can you define a new var like following instead of the number {{20}}? It will be easy to find
and be adjusted once we want to change the value later.
{code}
  private static final int KSM_TEST_HANDLER_COUNT = 20;
{code}
Thanks.

> 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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