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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7896) HA: if both NNs are in Standby mode, client needs to try failing back and forth several times with sleeps
Date Thu, 08 Dec 2011 05:51:39 GMT
HA: if both NNs are in Standby mode, client needs to try failing back and forth several times
with sleeps
---------------------------------------------------------------------------------------------------------

                 Key: HADOOP-7896
                 URL: https://issues.apache.org/jira/browse/HADOOP-7896
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: ipc
    Affects Versions: HA Branch (HDFS-1623)
            Reporter: Todd Lipcon
            Assignee: Aaron T. Myers
            Priority: Critical


For a manual failover, there may be an intermediate state for a non-trivial amount of time
where both NNs are in standby mode. Currently, the failover proxy will immediately failover
on receiving this exception from the first NN, and when it hits the same exception on the
second NN, it immediately fails. It should probably fail back and forth nearly indefinitely
if both NNs are in Standby mode.

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