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Posted to issues@ozone.apache.org by "Shashikant Banerjee (Jira)" <ji...@apache.org> on 2021/05/11 05:15:00 UTC
[jira] [Resolved] (HDDS-5173) Divide snapshot related work into
notifyInstallSnapshotFromLeader and reinitialize for SCMStateMachine.
[ https://issues.apache.org/jira/browse/HDDS-5173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
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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