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https://issues.apache.org/jira/browse/HDFS-2246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113624#comment-13113624
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Milind Bhandarkar commented on HDFS-2246:
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@Suresh, An example of an overridden host comparator would check if the same
data-storage-specific file in / can be accessed by both datanode and dfsclient
to determine if they are running on the same node. (Thus, shared storage and
chroot issue can be addressed.)
> 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, HDFS-2246.20s.1.patch,
> HDFS-2246.20s.2.txt, HDFS-2246.20s.3.txt, HDFS-2246.20s.4.txt,
> HDFS-2246.20s.patch, localReadShortcut20-security.2patch
>
>
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