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https://issues.apache.org/jira/browse/SOLR-12723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrzej Bialecki updated SOLR-12723:
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Attachment: SOLR-12723.patch
> 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 for every update
> {{HashBasedRouter.hashToSlice}} method, 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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