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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12163) Ozone: MiniOzoneCluster uses 400+ threads
Date Wed, 19 Jul 2017 21:36:01 GMT
Tsz Wo Nicholas Sze created HDFS-12163:

             Summary: 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

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.

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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