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From "Robert Chansler (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3057) DataNode to send block reports to multiple namenodes?
Date Fri, 28 Mar 2008 18:56:24 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3057?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Chansler updated HADOOP-3057:
------------------------------------

    Component/s: dfs

> DataNode to send block reports to multiple namenodes?
> -----------------------------------------------------
>
>                 Key: HADOOP-3057
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3057
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Marco Nicosia
>            Priority: Minor
>
> I have this theory that I could test the memory footprint of a new version of the Hadoop
namenode, without interrupting a running instance. We could shut down the secondary namenode
process, and run a new version of the namenode code on the image file found on the secondary
namenode server.
> But just running on the image file wouldn't be enough. It'd be great if I could get a
real feel by having all the block reports also make their way to my fake namenode.
> Would it be possible for datanodes to report to two different namenodes, even if only
one is the "active, live" namenode? (I understand that this wouldn't work if the format of
the block report, or worse, the rpc layer, were incompatible.)

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