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From "Todd Lipcon (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2627) HA: determine DN's view of which NN is active based on heartbeat responses
Date Thu, 08 Dec 2011 02:00:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved HDFS-2627.
-------------------------------

       Resolution: Fixed
    Fix Version/s: HA branch (HDFS-1623)
     Hadoop Flags: Reviewed

Committed to the branch, thanks for the review.
                
> HA: determine DN's view of which NN is active based on heartbeat responses
> --------------------------------------------------------------------------
>
>                 Key: HDFS-2627
>                 URL: https://issues.apache.org/jira/browse/HDFS-2627
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: hdfs-2627-v1.txt, hdfs-2627-v2.txt
>
>
> This is the first part of the design described in [this comment|https://issues.apache.org/jira/browse/HDFS-1972?focusedCommentId=13160601&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13160601]
in HDFS-1972. When the DNs start, they should not consider either of the NNs in a block pool
to be the active one. Rather, the NNs should include their HA state as part of the heartbeat
response to the DN, and the DN will believe whichever NN claims to be active at a higher transaction
ID.

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