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https://issues.apache.org/jira/browse/IGNITE-7807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Igor Seliverstov reassigned IGNITE-7807:
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Assignee: Igor Seliverstov
> SQL TX: Store lock info inside tuples
> -------------------------------------
>
> Key: IGNITE-7807
> URL: https://issues.apache.org/jira/browse/IGNITE-7807
> Project: Ignite
> Issue Type: Task
> Components: sql
> Reporter: Vladimir Ozerov
> Assignee: Igor Seliverstov
> Priority: Major
>
> We need to store lock info inside tuples. Otherwise, touching a lot of
> entries would lead to OOME. Also we should rework our locking logic - instead
> of trying to enlist ourselves in every entry, we should stop on the very
> first locked entry and wait for it's release.
> Suggested fix:
> 1) Check for {{lock_id}} field of an entry
> 2) If it is empty, CAS own XID
> 3) If it is not empty, check fo TX LOG to see if transaction is still active;
> if not - CAS itself
> 4) If failed to install own version - stop locking and wait for release
> 5) When transaction commits, no locks are released explicilty. Instead, it is
> responsibility of the next locker to check TX LOG and undesrantnad whether
> entry could be locked or not
> 6) When lock is acquired, create new version of an entry with lock info
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