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Posted to common-dev@hadoop.apache.org by "Todd Lipcon (Created) (JIRA)" <ji...@apache.org> on 2011/12/08 06:51:39 UTC
[jira] [Created] (HADOOP-7896) HA: if both NNs are in Standby mode,
client needs to try failing back and forth several times with sleeps
HA: if both NNs are in Standby mode, client needs to try failing back and forth several times with sleeps
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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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[jira] [Resolved] (HADOOP-7896) HA: if both NNs are in Standby
mode, client needs to try failing back and forth several times with sleeps
Posted by "Aaron T. Myers (Resolved) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-7896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aaron T. Myers resolved HADOOP-7896.
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Resolution: Fixed
Fix Version/s: HA Branch (HDFS-1623)
Hadoop Flags: Reviewed
Thanks a lot for the reviews, Eli and Todd. I've just committed this.
> 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
> Fix For: HA Branch (HDFS-1623)
>
> 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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