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https://issues.apache.org/jira/browse/IGNITE-18026?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Denis Chudov updated IGNITE-18026:
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Issue Type: Improvement (was: Bug)
> Rework HLC propagation in parts related to Raft
> -----------------------------------------------
>
> Key: IGNITE-18026
> URL: https://issues.apache.org/jira/browse/IGNITE-18026
> Project: Ignite
> Issue Type: Improvement
> Reporter: Denis Chudov
> Priority: Major
> Labels: ignite-3
>
> *Motivation:*
> As for now, HLC propagates via replica messages and Raft appendEntries
> messages. The latter required changes in jraft code which was done under
> IGNITE-17221 . Replica safe time (see IGNITE-17263 ) also uses HLC timestamps
> coming from leader, but these timestamps should be applied only on commiting
> index, so the whole mechanism consists of two steps: creating safe time
> candidate on processing of appendEntries request, and appying it on index
> commit.
> All of this have grown up into significant amount of invasive code in jraft
> which is not related to Raft protocol itself. It can be reworked by moving
> the loginc replated to HLC and safe time propagation to ignite state machine
> listener working on top of Raft.
> *Definition of done:*
> There is no code related to HLC and safe time left in ignite-raft module.
> *Implementation notes:*
> Raft write commands can be enriched with HybridTimestamps. Idle HLC
> adjustment could be done using SafeTimeSyncCommand (it should be renamed in
> this case). Safe time candidates will no longer be needed.
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