[jira] [Resolved] (SOLR-12723) Reduce object creation in HashBasedRouter

["Andrzej Bialecki (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-12723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrzej Bialecki  resolved SOLR-12723.
--------------------------------------
    Resolution: Fixed

> Reduce object creation in HashBasedRouter
> -----------------------------------------
>
>                 Key: SOLR-12723
>                 URL: https://issues.apache.org/jira/browse/SOLR-12723
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Andrzej Bialecki 
>            Assignee: Andrzej Bialecki 
>            Priority: Major
>             Fix For: 7.5
>
>         Attachments: SOLR-12723.patch
>
>
> When the default {{CompositeIdRouter}} is used it calls {{HashBasedRouter.hashToSlice}} method for every update, which obtains a collection of active slices from the current {{DocCollection}} and then iterates over it checking what range contains the document's id hash.
> Each time this creates a new iterator, which is wasteful - a much lightweight approach would be to construct a {{Slice[]}} when {{DocCollection}} is constructed and use indexed access to this array.
> This change has especially visible impact on simulator performance for large scale tests, where other costs are not present.



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