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From "Hari Mankude (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2866) Standby does not start up due to a gap in transaction id
Date Wed, 01 Feb 2012 02:10:56 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197511#comment-13197511

Hari Mankude commented on HDFS-2866:

don't we need a shared copy of fsimage? If it is kept in local dirs, there would be a problem
with two NNs formatting unless something like metadata copy is done from local dirs of NN1
to NN2. 

Also, working with local image of fsimage might make it difficult to catch issues if there
is divergence.

keeping it in shared will ensure that second NN does not have to format.
> Standby does not start up due to a gap in transaction id
> --------------------------------------------------------
>                 Key: HDFS-2866
>                 URL: https://issues.apache.org/jira/browse/HDFS-2866
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Hari Mankude
>            Priority: Critical
> Standby notices a gap in the transaction id in the shared.edits directory. The transactions
in dfs.edits.dir does not seem to have the gap. The gap happens during a failover.

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