[jira] [Commented] (LUCENE-5425) Make creation of FixedBitSet in FacetsCollector overridable

["Lei Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13887340#comment-13887340 ] 

Lei Wang commented on LUCENE-5425:
----------------------------------

Better not to depend on the bitset, it's better to depend on a more general interface. In the user's application, it they can get rid of the memset part of that data structure, like us in twitter, it can get 4X + performance improvements than a simple caching of the bitset.

> Make creation of FixedBitSet in FacetsCollector overridable
> -----------------------------------------------------------
>
>                 Key: LUCENE-5425
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5425
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>    Affects Versions: 4.6
>            Reporter: John Wang
>         Attachments: facetscollector.patch
>
>
> In FacetsCollector, creation of bits in MatchingDocs are allocated per query. For large indexes where maxDocs are large creating a bitset of maxDoc bits will be expensive and would great a lot of garbage.
> Attached patch is to allow for this allocation customizable while maintaining current behavior.



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