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https://issues.apache.org/jira/browse/HDDS-10971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrei Mikhalev updated HDDS-10971:
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Summary: Replace ConcurrentHashMap with HashMap in PipelineStateMap (was:
Replace ConcurrentHashMap with HashMap protected in PipelineStateMap)
> Replace ConcurrentHashMap with HashMap in PipelineStateMap
> ----------------------------------------------------------
>
> Key: HDDS-10971
> URL: https://issues.apache.org/jira/browse/HDDS-10971
> Project: Apache Ozone
> Issue Type: Improvement
> Components: SCM
> Affects Versions: 1.4.0
> Reporter: Andrei Mikhalev
> Assignee: Andrei Mikhalev
> Priority: Major
>
> There is a class
> [PipelineStateMap|https://github.com/apache/ozone/blob/master/hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/pipeline/PipelineStateMap.java#L50]
> with 2 fields:
> # {{ConcurrentHashMap<PipelineID, Pipeline> pipelineMap}}
> # {{ConcurrentHashMap<PipelineID, NavigableSet<ContainerID>>
> pipeline2container}}
> Both *read* and *write* in _PipelineStateMap_ are protected by {*}lock{*} in
> [PipelineStateManagerImpl|https://github.com/apache/ozone/blob/master/hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/pipeline/PipelineStateManagerImpl.java#L49]
> .
> We can safely replace _ConcurrentHashMap_ with pure _HashMap_
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