[HDFS-12163] Ozone: Reduce MiniOzoneCluster handler thread count

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: HDFS-7240
• Component/s: ozone, test
• Target Version/s: HDFS-7240
• Hadoop Flags: Reviewed
• Assignee: Weiwei Yang
• Reporter: Tsz-wo Sze
• Created: 19/Jul/17 21:35
• Updated: 26/Apr/18 21:52
• Resolved: 04/Aug/17 18:34

Description

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.