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https://issues.apache.org/jira/browse/HDFS-2866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197317#comment-13197317
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Hari Mankude commented on HDFS-2866:
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Hi Aaron,
I don't think this is same as hdfs-2794. Here, I have two nfs-mounted edits
directory(shared and one for fsimage/edits). During failover, edit logs in
shared directory is missing a edit log entry while the edit log entry appears
on the other edits directory. Basically, the two sets of edit logs are off by
one txid. The new primary starts off with the highest txid. However, the
standby notices a gap in the edit logs and cannot proceed further since the
standby is using shared edits to roll forward.
> 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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