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https://issues.apache.org/jira/browse/IGNITE-15085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17444419#comment-17444419
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Vyacheslav Koptilin commented on IGNITE-15085:
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Hello [~alapin],
Could you please take a look at this pull request?
> Implement tx coordination
> -------------------------
>
> Key: IGNITE-15085
> URL: https://issues.apache.org/jira/browse/IGNITE-15085
> Project: Ignite
> Issue Type: Task
> Reporter: Alexey Scherbakov
> Assignee: Alexey Scherbakov
> Priority: Major
> Labels: iep-61, ignite-3
> Time Spent: 7h 40m
> Remaining Estimate: 0h
>
> This ticket implies the implementation of tx coordination, as described in
> [1].
> This includes:
> * TxManager - top-level manager for tx state and coordination
> * pre-writes - each tx write is pre-written to partition store in special
> format
> * replicated tx state - tx state is stored in the partition's raft group
> * integration with lock manager (see *precaution* chapter in [1])
> The example of single key tx:
> {noformat}
> Tx client TxCoordinator
> Partition leaseholder.
> tx.start
> --------->
> assign timestamp (id)
> txstate = PENDING
> <---------
> table.put(k,v)
> --------->
> enlist(partition(k));
> lh = getLeaseholder(partition(k))
> send UpsertCommand(k) to lh
>
> ------------>
>
> replicate txstate = PENDING
>
> lockManager.tryAcquire(k,timestamp);
>
> wait for completion async
>
> prewrite(k, v) -- replicate to all replicas
> repeat for each enlisted partition...
> <---------
> tx.finish - commit or rollback
> --------->
> send finish request to all remote enlisted nodes
>
> ------------>
>
> replicate txstate = COMMITTED/ABORTED
> txState = COMMITTED/ABORTED
> lockManager.tryRelease(k, timestamp)
>
> <------------
>
> when all leasholders are replied,
> reply to initiator
> <--------
> {noformat}
> [1] [https://github.com/apache/ignite-3/tree/main/modules/transactions]
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