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https://issues.apache.org/jira/browse/HDDS-16086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siyao Meng updated HDDS-16086:
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Status: Patch Available (was: In Progress)
> installCheckpoint sets OM transaction info inconsistent with the checkpoint
> index
> ---------------------------------------------------------------------------------
>
> Key: HDDS-16086
> URL: https://issues.apache.org/jira/browse/HDDS-16086
> Project: Apache Ozone
> Issue Type: Bug
> Components: OM
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Minor
> Labels: pull-request-available
>
> Two functions write the in-memory transaction info of the OM, and they write
> different values.
>
> {{loadSnapshotInfoFromDB()}} reads the value from the installed checkpoint
> DB. This value is correct.
> [installCheckpoint|https://github.com/apache/ozone/blob/fb9f30b88694f8fcc876af786d38b86a2aa89d76/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OzoneManager.java#L4387]
> writes the TermIndex from before the installation, but the next line
> [unpauses|https://github.com/apache/ozone/blob/fb9f30b88694f8fcc876af786d38b86a2aa89d76/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OzoneManager.java#L4388]
> the state machine at the index of the checkpoint:
> {code:java}
> setTransactionInfo(TransactionInfo.valueOf(termIndex)); // pre-install
> omRatisServer.getOmStateMachine().unpause(lastAppliedIndex, term); //
> checkpoint index
> {code}
>
> {{OzoneManagerStateMachine.getLatestSnapshot()}} gives this field to Ratis.
> Ratis corrects it later, on another thread, when
> {{StateMachineUpdater.reload()}} calls {{{}reinitialize(){}}}.
>
> A TLA+ model of the follower snapshot-installation path found this issue.
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