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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4238) [HA] Standby namenode should not do purging of shared storage edits.
Date Mon, 03 Dec 2012 02:59:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508442#comment-13508442

Aaron T. Myers commented on HDFS-4238:

bq. lwr:this isn't accurate.standby nn purged editlog from the share storage in StandbyCheckpointer.
i will changed it to only the active did that for this issue

I'm sorry, but I still don't understand. Are you saying that the Standby NN actually performed
the deletions of files from the shared edits dir? Or that it triggered the removals at checkpoint
time? Can you perhaps point to the line(s) of code you're referring to in the StandbyCheckpointer?
> [HA] Standby namenode should not do purging of shared storage edits.
> --------------------------------------------------------------------
>                 Key: HDFS-4238
>                 URL: https://issues.apache.org/jira/browse/HDFS-4238
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 3.0.0, 2.0.2-alpha
>            Reporter: Vinay
> This happened in our cluster,
> >> Standby NN was keep doing checkpoint every one hour and uploading to Active
NN was continuously failing due to some kerberos issue and nobody noticed this, since Active
was servicing properly.
> >> Active NN was up for long time with fsimage having very least transaction.
> >> Standby NN has saved the checkpoint in its name dir and purged the txns >
1000000 from shared storage ( includes edits which are not present in Active NN's fsimage)
> >> After some time Active NN is restarted and StandBy NN switched to Active.
> Now current Standby not able to load any edits from shared storage, as expected edits
are not present in shared storage. Its keep running idle.
> So {{editLog.purgeLogsOlderThan(purgeLogsFrom);}} always should be called from Active

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