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https://issues.apache.org/jira/browse/HDFS-2866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198475#comment-13198475
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Aaron T. Myers commented on HDFS-2866:
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bq. I would appreciate if hdfs-2874 is closed as a dup of this one.
But they're distinct issues. In this JIRA, the NNs were effectively configured
with two shared edits dirs, although only one was configured as being shared. A
single failover caused a problem. In HDFS-2874, there's only one shared dir
(i.e. correct configuration) but on a failover and failback, the once-active NN
may read from the local dir and not the shared dir first, and thus end up with
overlapping ranges of transactions.
You can obviously leave open both HDFS-2865 and HDFS-2866 if you want, but they
seem like the same issue to me.
> 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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