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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-1972) HA: Datanode fencing mechanism
Date Fri, 20 May 2011 16:34:47 GMT
HA: Datanode fencing mechanism
------------------------------

                 Key: HDFS-1972
                 URL: https://issues.apache.org/jira/browse/HDFS-1972
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: data-node, name-node
            Reporter: Suresh Srinivas
            Assignee: Suresh Srinivas


In high availability setup, with an active and standby namenode, there is a possibility of
two namenodes sending commands to the datanode. The datanode must honor commands from only
the active namenode and reject the commands from standby, to prevent corruption. This invariant
must be complied with during fail over and other states such as split brain. This jira addresses
issues related to this, design of the solution and implementation.


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