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https://issues.apache.org/jira/browse/HDFS-5848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13885990#comment-13885990
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Tsz Wo (Nicholas), SZE commented on HDFS-5848:
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Heartbeat response is called "DatanodeCommand" in the code. It will keep
sending RollingUpgradeCommand for every heartbeat during rolling upgrade.
> Add a DatanodeCommand to inform datanodes that rolling upgrade is in progress
> -----------------------------------------------------------------------------
>
> Key: HDFS-5848
> URL: https://issues.apache.org/jira/browse/HDFS-5848
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h5848_20130130.patch
>
>
> When rolling upgrade is in progress, NN should inform datanodes via heartbeat
> responses so that datanode should create hardlinks when deleting blocks. We
> need to add a new DatanodeCommand here. The datanode change will be done in
> a separated JIRA.
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