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https://issues.apache.org/jira/browse/HDFS-7434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated HDFS-7434:
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Attachment: HDFS-7434.patch
UUID becomes immutable and the hashCode of DatanodeIds. Updated the few tests
that relied on mutating the uuid to create new instances instead. This
actually makes the tests more accurate because real registrations are not using
the exact same object reference. DatanodeIds are now safe for collections.
> DatanodeID hashCode should not be mutable
> -----------------------------------------
>
> Key: HDFS-7434
> URL: https://issues.apache.org/jira/browse/HDFS-7434
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
> Attachments: HDFS-7434.patch
>
>
> Mutable hash codes may lead to orphaned instances in a collection. Instances
> must always be removed prior to modification of hash code values, and
> re-inserted. Although current code appears to do this, the mutable hash code
> is a landmine.
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