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https://issues.apache.org/jira/browse/HDFS-3725?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved HDFS-3725.
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Resolution: Fixed
Fix Version/s: QuorumJournalManager (HDFS-3077)
Hadoop Flags: Reviewed
Thanks, committed to branch.
> Fix QJM startup when individual JNs have gaps
> ---------------------------------------------
>
> Key: HDFS-3725
> URL: https://issues.apache.org/jira/browse/HDFS-3725
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha
> Affects Versions: QuorumJournalManager (HDFS-3077)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Minor
> Fix For: QuorumJournalManager (HDFS-3077)
>
> Attachments: hdfs-3725.txt
>
>
> This fixes a bug in the HDFS-3077 branch:
> If one of the JNs goes down and comes back up, it may have a discontiguous
> set of logs in its storage directories. This means that a future
> {{getEditLogManifest}} call will return a manifest that has gaps - eg it may
> have txn 1-3 and 7-9 but be missing 4-6. This is OK because it's guaranteed
> that a quorum of JNs do have those edits elsewhere.
> This situation currently causes an exception since the RemoteEditLogManifest
> constructor verifies that the returned log files form a contiguous set of
> edits. That was true for the NameNode but no longer true for this new usage.
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