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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1696) HDFS Federation: when build version doesn't match - datanode should wait (keep connecting) untill NN comes up with the right version
Date Thu, 03 Mar 2011 07:52:37 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13001902#comment-13001902
] 

Suresh Srinivas commented on HDFS-1696:
---------------------------------------

More description of the change:
In federation block pools are upgraded one at a time. Consider a case where a datanode is
started with a later release and the namenode is not yet upgraded. In that case, instead of
shutting down or stop talking to the namenode, the datanode continues to periodically perform
handshake with the namenode. This ensures that if one or more namenodes are not upgraded yet,
the datanode continues to perform handshakes and finally upgrades the block pool corresponding
to the namenode, when the namenode is upgraded.

This helps need for restarting the datanode, if a namenode had not been upgraded when the
cluster started up.

> HDFS Federation: when build version doesn't match - datanode should wait (keep connecting)
untill NN comes up with the right version 
> -------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1696
>                 URL: https://issues.apache.org/jira/browse/HDFS-1696
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Boris Shkolnik
>            Assignee: Boris Shkolnik
>         Attachments: HDFS-1696-1.patch, HDFS-1696.patch
>
>


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