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From "Eli Collins (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2179) HA: namenode fencing mechanism
Date Fri, 06 Jan 2012 20:04:42 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Eli Collins updated HDFS-2179:

    Issue Type: New Feature  (was: Sub-task)
        Parent:     (was: HDFS-1623)
> HA: namenode fencing mechanism
> ------------------------------
>                 Key: HDFS-2179
>                 URL: https://issues.apache.org/jira/browse/HDFS-2179
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: HA branch (HDFS-1623)
>         Attachments: hdfs-2179.txt, hdfs-2179.txt, hdfs-2179.txt
> In an HA cluster, when there are two NNs, the invariant that only one NN is active at
a time has to be preserved in order to prevent "split brain syndrome." Thus, when a standby
NN is transition to "active" state during a failover, it needs to somehow _fence_ the formerly
active NN to ensure that it can no longer perform edits. This JIRA is to discuss and implement
NN fencing.

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