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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1623) High Availability Framework for HDFS NN
Date Mon, 25 Jul 2011 17:36:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13070622#comment-13070622
] 

Suresh Srinivas commented on HDFS-1623:
---------------------------------------

The problem is not with the timing of delivery of disconnect event. During fail over, the
standby taking over as active may not be able to communicate with previous active (directly/indirectly)
to assert that the previous active has relinquished the role of active. This could be due
to network partition, active not functional due to GC, OS issues etc. In such a scenario,
the only way for new active to ensure shared resource is not controlled by two actives is
to fence the shared resource.

> High Availability Framework for HDFS NN
> ---------------------------------------
>
>                 Key: HDFS-1623
>                 URL: https://issues.apache.org/jira/browse/HDFS-1623
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>         Attachments: HDFS-High-Availability.pdf, NameNode HA_v2.pdf, NameNode HA_v2_1.pdf,
Namenode HA Framework.pdf
>
>


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