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https://issues.apache.org/jira/browse/IGNITE-5613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexey Goncharuk resolved IGNITE-5613.
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Resolution: Fixed
Merged to master.
> AtomicSequence usage inside transactions may cause deadlock
> -----------------------------------------------------------
>
> Key: IGNITE-5613
> URL: https://issues.apache.org/jira/browse/IGNITE-5613
> Project: Ignite
> Issue Type: Bug
> Components: cache
> Affects Versions: 1.5.0.final
> Reporter: Alexey Goncharuk
> Assignee: Alexey Goncharuk
> Labels: important
> Fix For: 2.1
>
>
> Consider the following update scenario:
> {code}
> Thread 1:
> Transaction tx = txStart() {
> get(key); // Acquires lock;
> seq.incrementAndGet();
> }
> Thread 2:
> seq.incrementAndGet();
> {code}
> Let's now assume that:
> * Sequence is exhausted and needs a non-local update
> * Thread 1 acquired lock on topology version N
> * Topology version changes
> * Thread 2 now calls incrementAndGet(), acquires lock and starts transaction
> which waits for topology version N+1 to become available
> * Thread 1 attemts to incrementAndGet().
> Since the lock is already held, thread 2 waits for the concurrent update to
> complete
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