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https://issues.apache.org/jira/browse/IGNITE-2545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov updated IGNITE-2545:
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Assignee: Andrew Mashenkov
> 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: Task
> Components: general
> Affects Versions: 1.5.0.final
> Reporter: Vladimir Ozerov
> Assignee: Andrew Mashenkov
> Labels: performance
> Fix For: 1.8
>
>
> *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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