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https://issues.apache.org/jira/browse/HDFS-6840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14139643#comment-14139643
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Aaron T. Myers commented on HDFS-6840:
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Latest patch looks good to me, +1. I agree that we can reasonably move the
improvements to the tests to make them deterministic to another JIRA. Andrew,
could you please go ahead and file that?
> Clients are always sent to the same datanode when read is off rack
> ------------------------------------------------------------------
>
> Key: HDFS-6840
> URL: https://issues.apache.org/jira/browse/HDFS-6840
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.5.0
> Reporter: Jason Lowe
> Assignee: Andrew Wang
> Priority: Critical
> Attachments: hdfs-6840.001.patch, hdfs-6840.002.patch,
> hdfs-6840.003.patch
>
>
> After HDFS-6268 the sorting order of block locations is deterministic for a
> given block and locality level (e.g.: local, rack. off-rack), so off-rack
> clients all see the same datanode for the same block. This leads to very
> poor behavior in distributed cache localization and other scenarios where
> many clients all want the same block data at approximately the same time.
> The one datanode is crushed by the load while the other replicas only handle
> local and rack-local requests.
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