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Posted to issues@ozone.apache.org by "Xu Shao Hong (Jira)" <ji...@apache.org> on 2021/01/15 10:01:00 UTC
[jira] [Created] (HDDS-4710) Pipeline: chooseDatanodes function
random pick not working
Xu Shao Hong created HDDS-4710:
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Summary: Pipeline: chooseDatanodes function random pick not working
Key: HDDS-4710
URL: https://issues.apache.org/jira/browse/HDDS-4710
Project: Hadoop Distributed Data Store
Issue Type: Bug
Reporter: Xu Shao Hong
Fix For: 1.1.0
Attachments: image-2021-01-15-17-46-31-492.png
I was trying to configure a four-node cluster to test SCM HA, after configuring the ozone.datanode.pipeline.limit to 3 and 5 separately, the pipeline existed only chose three data nodes, the fourth node was never chosen.(They are equal nodes)
The bug here is due to that the method *{color:#172b4d}+chooseDatanodes+{color}* in PipelinePlacementPolicy calls *+super.getResultSet+*, in which another method +{color:#172b4d}*chooseNode*{color}+ is called. This +*chooseNode*+ method is an abstract method in the superclass and is overridden in PipelinePlacementPolicy. The overridden version uses a simple logic instead of a randomly chosen policy which incurs my problem.
I will attempt to fix it and attach my pr link ~ !image-2021-01-15-17-46-31-492.png!
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