[jira] [Updated] (HDDS-10971) Replace ConcurrentHashMap with HashMap in PipelineStateMap

["Andrei Mikhalev (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-10971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrei Mikhalev updated HDDS-10971:
-----------------------------------
    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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