[infinispan-issues] [JBoss JIRA] (ISPN-1988) coalesce same key writes within a transaction

[Mircea Markus (JIRA)]

Mircea Markus created ISPN-1988:
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             Summary: coalesce same key writes within a transaction
                 Key: ISPN-1988
                 URL: https://issues.jboss.org/browse/ISPN-1988
             Project: Infinispan
          Issue Type: Feature Request
          Components: Transactions
    Affects Versions: 5.1.4.FINAL
            Reporter: Mircea Markus
            Assignee: Mircea Markus
             Fix For: 5.2.0.FINAL


Following code run with optimistic caches:

start tx
put k, v1
put k, v2
put k, v3
commit

Would cause the PrepareCommand that is sent around to contain 3 PutKeyvalueCommands which is sub-optimal. What we can do is to only send the last written value (i.e. k v3) and ignore the previous two (reuse the code in AsyncCacheStore). Besides reducing the payload, from this would benefit the AtomicHashMaps which uses this code quite a lot and also the OptimisticLockingInterceptor which would not attempt to order the keys.

I guess this should be a feature that is disabled by default, as I don't think it is required in general. Might as well be not configurable, enabled by default feature. Comments? 



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