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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2627) HA: determine DN's view of which NN is active based on heartbeat responses
Date Sat, 03 Dec 2011 01:25:41 GMT
HA: determine DN's view of which NN is active based on heartbeat responses
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                 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


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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