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https://issues.apache.org/jira/browse/HDFS-5242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13851206#comment-13851206
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Daryn Sharp commented on HDFS-5242:
-----------------------------------
An atomic reference would be fine but I'm not sure it adds value. The setter
is called when adding the node to the network topology - after which, it is
never changed. Another thread can't get the instance w/o going through the
topology, and the instance isn't in the topology until after the network
location is set.
> Reduce contention on DatanodeInfo instances
> -------------------------------------------
>
> Key: HDFS-5242
> URL: https://issues.apache.org/jira/browse/HDFS-5242
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-5242.patch
>
>
> Synchronization in {{DatanodeInfo}} instances causes unnecessary contention
> between call handlers.
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