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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2121) Add ability to create block replicas during off-switch reads
Date Sun, 03 Jul 2011 02:36:22 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13059157#comment-13059157

Sanjay Radia commented on HDFS-2121:

I'm no longer at Yahoo!.  My new email address is sanjay@hortonworks.com.  Please update your
address book and resend your message.

> Add ability to create block replicas during off-switch reads
> ------------------------------------------------------------
>                 Key: HDFS-2121
>                 URL: https://issues.apache.org/jira/browse/HDFS-2121
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Arun C Murthy
> Idea: when a DFSClient reads an off-switch replica, we could tee an extra, temporal replica
to the local DN if the NN thinks it makes sense. 
> Then we could delete the ones which were part of the original 2 on the rack to rebalance
or just rely on the balancer... all this would ensure better spread across the cluster. This
would also help with hotspots on datasets.
> Thoughts?

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