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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2121) Add ability to create block replicas during off-switch reads
Date Fri, 01 Jul 2011 07:04:28 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated HDFS-2121:
--------------------------------

    Summary: Add ability to create block replicas during off-switch reads  (was: Add ability
to create block replicas off non-rack reads)

> 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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