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https://issues.apache.org/jira/browse/HDFS-5585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13885590#comment-13885590
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Vinay commented on HDFS-5585:
-----------------------------
changes looks good kihwal.
some minor suggestions
you might want to add "\n" at the end of these lines for better looking,
bq. + String shutdownDatanode = "-shutdownDatanode <datanode_host:ipc_port>
\[upgrade\]" +
bq. + String pingDatanode = "-pingDatanode <datanode_host:ipc_port>" +
> 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
> Assignee: Kihwal Lee
> Attachments: HDFS-5585.patch
>
>
> 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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