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https://issues.apache.org/jira/browse/HDFS-16690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He resolved HDFS-16690.
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Fix Version/s: 3.5.0
Hadoop Flags: Reviewed
Resolution: Fixed
> Automatically format new unformatted JournalNodes using JournalNodeSyncer
> --------------------------------------------------------------------------
>
> Key: HDFS-16690
> URL: https://issues.apache.org/jira/browse/HDFS-16690
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: journal-node
> Affects Versions: 3.4.0, 3.3.5
> Environment: Demonstrated in a Kubernetes environment running Java 11.
> # Start new cluster, but short 1 JN (minimum quorum, and the missing JN
> won’t resolve). VERIFY:
> - NN formats the 2 existing JN and stabilizes. NOTE: Formatting using just
> a quorum will be a separate submission
> - Messages show sync between JN-0 and JN-1, and NN -> JN.
> # Scale JN stateful set to add missing JN. VERIFY:
> - New JN starts
> - All other JN and all NN report IP address change (IP Address resolution).
> NOTE: require HADOOP-18365 and HDFS-16688
> - Messages show sync between all JN, and NN -> JN
> - New JN is formatted at least once (possibly by multiple other JN)
> - New JN storage directory is formatted only once
> - New JN joins cluster (lastWriterEpoch is non-zero)
> Reporter: Steve Vaughan
> Assignee: Aswin M Prabhu
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.5.0
>
>
> If an unformatted JournalNode is added to an existing JournalNode set,
> instances of the JournalNodeSyncer are unable to sync to the new node. When
> a sync receives a JournalNotFormattedException, we can initiate a format
> operation, and then retry the synchronization.
> Conceptually this means that the JournalNodes and their data can be managed
> independently from the rest of the system, as the JournalNodes will
> incorporate new JournalNode instances. Once the new JournalNode is
> formatted, it can participate in shared edits from the NameNodes.
> I've been testing an update to the InterQJournalProtocol to add a format call
> like that used by the NameNode. Current tests include starting an HA cluster
> from scratch, but with 2 JournalNode instances. Once the cluster is up, I
> can add the 3rd JournalNode (which is unformatted), and the other 2
> JournalNodes will eventually attempt to sync which results in a formatting
> and subsequent sync.
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