[jira] [Resolved] (GEODE-7814) Unnecessary Object Allocations in DistributionMessage

["Juan Ramos (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GEODE-7814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Juan Ramos resolved GEODE-7814.
-------------------------------
    Fix Version/s: 1.13.0
       Resolution: Fixed

> Unnecessary Object Allocations in DistributionMessage
> -----------------------------------------------------
>
>                 Key: GEODE-7814
>                 URL: https://issues.apache.org/jira/browse/GEODE-7814
>             Project: Geode
>          Issue Type: Bug
>          Components: membership
>            Reporter: Juan Ramos
>            Assignee: Juan Ramos
>            Priority: Major
>              Labels: GeodeCommons
>             Fix For: 1.13.0
>
>         Attachments: countDifference.png, timeSpent.png
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The {{DistributionMessage}} class unnecessary allocates instances of {{java.util.Collection$SingletonList}} and {{InternalDistributedMember[]}} through the attributes {{EMPTY_RECIPIENTS_ARRAY}} and {{ALL_RECIPIENTS_LIST}}.
> These attributes are {{final}} and only used to execute internal comparisons but, since they are not declared as {{static}}, every instance of {{DistributionMessage}} will have its own instance, generating unnecessary garbage.
> Using one of our internal testing scenarios and a java profiler we detected that we create 0 instances of {{java.util.Collection$SingletonList}} and {{InternalDistributedMember[]}} using Geode 1.10, but 14.824 and 11.212 respectively when using the latest {{develop}} branch.
> The increase in the memory footprint is not much (around 1MB all together), and the time spent on this operation is around 1.5 seconds slower overall (screenshots attached).



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