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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