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https://issues.apache.org/jira/browse/HDFS-2246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13103653#comment-13103653
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Nathan Roberts commented on HDFS-2246:
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Two comments:
1) I really wish someone would provide some real benchmarks showing the benefit
of this patch AFTER HDFS-941. Prior to HDFS-941, going through the datanode for
everything was a nightmare and going direct to the file was a huge win. I'd
really like to see a more recent comparison (apologies if someone did this
comparison and I just missed it.)
2) I'd like to see some comments somewhere about how this affects data
visibility guarantees. Maybe around the definition of the new config option.
> Shortcut a local client reads to a Datanodes files directly
> -----------------------------------------------------------
>
> Key: HDFS-2246
> URL: https://issues.apache.org/jira/browse/HDFS-2246
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Sanjay Radia
> Attachments: 0001-HDFS-347.-Local-reads.patch,
> localReadShortcut20-security.2patch
>
>
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