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https://issues.apache.org/jira/browse/HDFS-12272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kihwal Lee resolved HDFS-12272.
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Resolution: Invalid
> chooseRemoteRack() semantics broken in trunk
> --------------------------------------------
>
> Key: HDFS-12272
> URL: https://issues.apache.org/jira/browse/HDFS-12272
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: block placement
> Affects Versions: 3.0.0-alpha3
> Reporter: Kihwal Lee
> Priority: Critical
>
> The {{chooseRemoteRack()}} method in the default block placement policy was
> designed to pick from maximum number of racks. E.g. If asked to pick 2 and
> there are 2 or more racks available, the two will be on different racks. It
> wasn't implicit or accidental semantics. There was a specific logic in
> {{chooseRandom()}} that makes it happen.
> This behavior is broken after HDFS-11530 as this logic was removed from
> {{chooseRandom()}}. Now the result is unpredictable. Sometimes the replicas
> end up in the same rack.
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