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https://issues.apache.org/jira/browse/HDDS-5173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shashikant Banerjee resolved HDDS-5173.
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Fix Version/s: 1.2.0
Resolution: Fixed
> Divide snapshot related work into notifyInstallSnapshotFromLeader and
> reinitialize for SCMStateMachine.
> --------------------------------------------------------------------------------------------------------
>
> Key: HDDS-5173
> URL: https://issues.apache.org/jira/browse/HDDS-5173
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Glen Geng
> Assignee: Glen Geng
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.2.0
>
>
> As mentioned in https://issues.apache.org/jira/browse/RATIS-1370
> During notifyInstallSnapshotFromLeader, StateMachineUpdater may call
> applyTransactions when StateMachine is in PAUSED state.
> Just divide snapshot related work into notifyInstallSnapshotFromLeader and
> reinitialize for SCMStateMachine.
> During notifyInstallSnapshotFromLeader, SCM just downloads snapshot but not
> modify StateMachine, since StateMachineUpdater is in RUNNING state, may call
> applyTransactions during this period.
> During reinitialize, SCM can safely reload the StateMachine, such as rocksdb
> and in-memory state. During this period, StateMachineUpdater is in RELOAD
> state, thus there will be no contention between SCM and StateMachineUpdater.
>
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