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https://issues.apache.org/jira/browse/IGNITE-2584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov closed IGNITE-2584.
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> Investigate whether GridDhtPartitionTopologyImpl.part2Node could have List as
> value.
> ------------------------------------------------------------------------------------
>
> Key: IGNITE-2584
> URL: https://issues.apache.org/jira/browse/IGNITE-2584
> Project: Ignite
> Issue Type: Task
> Components: cache
> Affects Versions: 1.5.0.final
> Reporter: Vladimir Ozerov
> Fix For: 1.6
>
>
> *Problem*
> "GridDhtPartitionTopologyImpl.part2Node" has value of type Set<UUID>.
> However, set semantics is almost never used except of node leave events which
> are pretty rate.
> Iterations over this Set require instantiation of iterators. This could be
> avoided if we replace HashSet with ArrayList.
> *Proposed solution*
> 1) Investigate whether Set "unique" semantics is exploited anywhere.
> 2) Investigate whether HashSet.get() O(1) is exploited on hot paths.
> 3) If neither p.1 nor p.2 hold - replace HashSet with ArrayList and change
> corresponding foreach-loops to counted for-loops.
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