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Date: Wed, 1 Feb 2012 01:01:08 +0000 (UTC)
From: "Aaron T. Myers (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HDFS-2866) Standby does not start up due to a
 gap in transaction id
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    [ https://issues.apache.org/jira/browse/HDFS-2866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197457#comment-13197457 ] 

Aaron T. Myers commented on HDFS-2866:
--------------------------------------

bq. One possibility I can imagine is that, if the NN writes a txn group to the local disk and fsyncs successfully, and then fails before writing to the shared storage, we could have this scenario.

Not unless we had a failover and failback, though, right? That doesn't seem to be what Hari was describing here.
                
> 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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