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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8041) HA: log a warning when a failover is first attempted
Date Thu, 09 Feb 2012 05:49:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HADOOP-8041:
--------------------------------

    Attachment: hadoop-8041.txt

Attached patch fixes the issue.
I didn't edit unit tests since this is just a logging change, but I verified on a cluster
that when the second NN is active, FsShell commands no longer print warnings. If I put both
NNs in standby mode, I get warnings as it flip-flops back and forth trying to find an active
one.
                
> HA: log a warning when a failover is first attempted 
> -----------------------------------------------------
>
>                 Key: HADOOP-8041
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8041
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Todd Lipcon
>         Attachments: hadoop-8041.txt
>
>
> Currently we always warn for each client operation made to a NN we've failed over to:
> {noformat}
> hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfs -lsr /
> 12/02/08 17:43:04 WARN retry.RetryInvocationHandler: Exception while invoking getFileInfo
of class org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB after 0 fail
over attempts. Trying to fail over immediately.
> {noformat}
> I'm going to remove this warning in HDFS-2918 since we shouldn't warn every time a client
performs an operation, eg could be weeks after the failover. But we should eg log a warning
eg the client first does a failover.

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