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Posted to hdfs-issues@hadoop.apache.org by "Suresh Srinivas (JIRA)" <ji...@apache.org> on 2014/01/29 23:02:11 UTC

[jira] [Commented] (HDFS-5848) Add a DatanodeCommand to inform datanodes that rolling upgrade is in progress

    [ https://issues.apache.org/jira/browse/HDFS-5848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13885875#comment-13885875 ] 

Suresh Srinivas commented on HDFS-5848:
---------------------------------------

Why is this a command and not a state that is always sent to DataNode? 

> 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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