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https://issues.apache.org/jira/browse/HDFS-12163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weiwei Yang updated HDFS-12163:
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Attachment: HDFS-12163-HDFS-7240.002.patch
Hi [~anu]
I am going to split this patch to two. v2 patch only contains the change to
mini ozone cluster, use the builder pattern to set number of scm/ksm handlers.
I will create another JIRA to track the remaining work of the thread leaks,
that can take longer.
Hope this makes sense.
> 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,
> 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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