[infinispan-issues] [JBoss JIRA] (ISPN-5723) Mixing sync and async commands results in missing locking on backup owners

[Radim Vansa (JIRA)]

Radim Vansa created ISPN-5723:
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             Summary: Mixing sync and async commands results in missing locking on backup owners
                 Key: ISPN-5723
                 URL: https://issues.jboss.org/browse/ISPN-5723
             Project: Infinispan
          Issue Type: Bug
          Components: Core
    Affects Versions: 8.0.0.Final
            Reporter: Radim Vansa


In non-tx synchronous cache, locking on backup owners relies on having lock on primary owner held while the command is invoked on backup owner.

In non-tx asynchronous cache, the order in which updates are applied relies again on primary owner, but then the updates to backup owners are propagated as ordered.

When you mix it using FORCE_ASYNCHRONOUS flag, it's broken, e.g. in synchronous cache, you send the command to primary owner (that's fine), but then you replicate it to backups without the lock being held. That update can come in different order and even concurrently with synchronous update, and on backup owner the lock is not acquired. This can be problematic especially for conditional updates.



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