[jira] [Created] (IGNITE-2545) GridCompoundFuture: Allocate ArrayList only if there are >1 futures.

[Anton Vinogradov (Jira)]

Vladimir Ozerov created IGNITE-2545:
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             Summary: GridCompoundFuture: Allocate ArrayList only if there are >1 futures.
                 Key: IGNITE-2545
                 URL: https://issues.apache.org/jira/browse/IGNITE-2545
             Project: Ignite
          Issue Type: Sub-task
          Components: general
    Affects Versions: 1.5.0.final
            Reporter: Vladimir Ozerov
             Fix For: 1.6


*Problem*
When GridCompoundFuture is created, empty emoty ArrayList for child futures is allocated immediately. When the very first child future is added, ArrayList automatically expands to Object[10].
But in most cases we will have much less than 10 futures, and quite often there will be only one.

*Proposal*
1) Run base put/get benchmarks with a single key and several nodes and estimate amount of child futures. This case be as easy as adding System.out() to GridCompoundFuture.init() method which will print list size.
2) Depending on the result we should do one of the following:
- Allocate ArrayList only after second future is added;
- Or allocate ArrayList with fewer amount of elemnts (say, 4) - this depends on what we will see in during tests.

This should be fairly simple to check and implement.



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