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https://issues.apache.org/jira/browse/HBASE-1012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791122#action_12791122
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stack commented on HBASE-1012:
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Leave this issue open I'd say. Todd Lipcon has made nice progress over in
HADOOP-4801. There is critical pushback, "why such a difference -- maybe we
should look more into why the canonical path is so slow", but the numbers are
too good to leave on the table.
> [performance] Try doctoring a dfsclient so it shortcircuits hdfs when blocks
> are local
> --------------------------------------------------------------------------------------
>
> Key: HBASE-1012
> URL: https://issues.apache.org/jira/browse/HBASE-1012
> Project: Hadoop HBase
> Issue Type: Task
> Reporter: stack
>
> Ning Li up on list has stated that getting blocks using hdfs though the block
> is local takes almost the same amount of time as accesing the block over the
> network. See if can do something smarter when the data is known to be local
> short-circuiting hdfs if we can in a subclass of DFSClient (George Porter
> suggestion).
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