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https://issues.apache.org/jira/browse/IGNITE-20002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17777193#comment-17777193
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Vladislav Pyatkov commented on IGNITE-20002:
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Merged 3e8cad9947c38ea05429599ad99d18c7bb59ac1f
> Implement durable unlock on primary partition re-election
> ---------------------------------------------------------
>
> Key: IGNITE-20002
> URL: https://issues.apache.org/jira/browse/IGNITE-20002
> Project: Ignite
> Issue Type: Improvement
> Reporter: Alexander Lapin
> Assignee: Denis Chudov
> Priority: Major
> Labels: ignite-3, transaction, transaction3_recovery
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> h3. Motivation
> It's required to release all acquired locks on transaction finish in a
> durable way. Such durability consists of two parts:
> * Durable unlock within same primary.
> * Durable unlock on primary change.
> This ticket is about second part only. There's a counterpart ticket for the
> first part IGNITE-20004
> h3. Definition of Done
> * All unreleased locks for the transactions that were finished are released
> in case of primary re-election, including old primary failure and cluster
> restart.
> h3. Implementation Notes
> * We may start with adding onPrimaryElected callback.
> * Within this callback, it's required to scan
> `org.apache.ignite.internal.tx.storage.state.TxStateStorage#scan` local
> TxStateStorage and call `org.apache.ignite.internal.tx.TxManager#cleanup` for
> all transactions that have false in TxMeta.locksReleased. TxManager#cleanup
> is an idempotent operation, thus it's safe to run it multiple time, even from
> different nodes, e.g. old primary and new primary.
> * It's required to add locksReleased field to TxMeta with default value
> false.
> * It's required to set locksReleases to true when all cleanup
> txCleanupReplicaRequest returns successfully. That extra
> "updateTxnState(locksReleased == true) should be asynchronous.
> * Tests will be non-trivial here, because it'll be required to kill old
> primary after txnStateChanged but before sending cleanup request.
>
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