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https://issues.apache.org/jira/browse/HDFS-17203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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farmmamba resolved HDFS-17203.
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Resolution: Fixed
> ReplicaMap#map should better use ConcurrentHashMap rather than HashMap
> ----------------------------------------------------------------------
>
> Key: HDFS-17203
> URL: https://issues.apache.org/jira/browse/HDFS-17203
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.4.0
> Reporter: farmmamba
> Assignee: farmmamba
> Priority: Major
>
> Even though we use BP write lock in ReplicaMap#initBlockPool method to
> initial <bpid,lightWeightResizableGSet> entry, we'd better change
> ReplicaMap#map from HashMap to ConcurrentHashMap. Because in ReplicaMap#add
> or ReplicaMap#addAndGet methods, we only use BP read lock to protect
> initialization.
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