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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5585) Provide admin commands for data node upgrade
Date Wed, 08 Jan 2014 04:44:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865062#comment-13865062
] 

Ming Ma commented on HDFS-5585:
-------------------------------

Interesting. Should client ask DN to do the upgrade via ClientDatanodeProtocol, or should
client ask NN to do the upgrade via refreshNodes approach and NN ask DNs after that? The nice
thing about going through NN is NN has the state and is able to decide the order in which
DNs are restarted to minimize the impact on write and read operation.

> Provide admin commands for data node upgrade
> --------------------------------------------
>
>                 Key: HDFS-5585
>                 URL: https://issues.apache.org/jira/browse/HDFS-5585
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, ha, hdfs-client, namenode
>            Reporter: Kihwal Lee
>
> Several new methods to ClientDatanodeProtocol may need to be added to support querying
version, initiating upgrade, etc.  The admin CLI needs to be added as well. This primary use
case is for rolling upgrade, but this can be used for preparing for a graceful restart of
a data node for any reasons.



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