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https://issues.apache.org/jira/browse/SOLR-9008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timothy Potter reassigned SOLR-9008:
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Assignee: (was: Timothy Potter)
> Investigate feasibilty and impact of using SparseFixedBitSet where Solr is
> currently using FixedBitSet
> ------------------------------------------------------------------------------------------------------
>
> Key: SOLR-9008
> URL: https://issues.apache.org/jira/browse/SOLR-9008
> Project: Solr
> Issue Type: Improvement
> Reporter: Timothy Potter
> Priority: Major
>
> Found this gem in one of Mike's blog posts:
> {quote}
> But with 5.0.0, Lucene now supports random-writable and advance-able sparse
> bitsets (RoaringDocIdSet and SparseFixedBitSet), so the heap required is in
> proportion to how many bits are set, not how many total documents exist in
> the index.
> {quote}
> http://blog.mikemccandless.com/2014/11/apache-lucene-500-is-coming.html
> I don't see any uses of either of these classes in Solr code but from a quick
> look, sounds compelling for saving memory, such as when caching fq's
> This ticket is for exploring where Solr can leverage these structures and
> whether there's an improvement in performance and/or memory usage.
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