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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7896) HA: if both NNs are in Standby mode, client needs to try failing back and forth several times with sleeps
Date Wed, 14 Dec 2011 03:28:31 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169048#comment-13169048
] 

Eli Collins commented on HADOOP-7896:
-------------------------------------

+1 lgtm
                
> 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: ha, ipc
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>            Priority: Critical
>         Attachments: HADOOP-7896-HDFS-1623.patch, HADOOP-7896-HDFS-1623.patch, HADOOP-7896-HDFS-1623.patch
>
>
> 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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