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https://issues.apache.org/jira/browse/HDFS-2866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197462#comment-13197462
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Hari Mankude commented on HDFS-2866:
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Todd's description is correct when there is local edits. We would need to
ensure that shared edit dirs is always first in the list of dirs that is being
written. This ensures that if failover happens when one of the updates is done
and the other update is pending, we start off with the higher txid and this
higher txid is available to the standby.
However, the other issue is to how to get the local dirs back in sync with
shared dir now that they have diverged.
> 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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