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https://issues.apache.org/jira/browse/SOLR-7787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14629832#comment-14629832
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Yonik Seeley commented on SOLR-7787:
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When HLL was first added, I remember scanning the code quickly and noting that
the explicit storage rehashed the given value (which is wasted effort given
that the provided values already need to be good hashes to start with). Is
there a way to avoid that? Prob not a big deal though.
> Fork HyperLogLog and remove fastutil dependency
> -----------------------------------------------
>
> Key: SOLR-7787
> URL: https://issues.apache.org/jira/browse/SOLR-7787
> Project: Solr
> Issue Type: Task
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Trivial
> Fix For: 5.3, Trunk
>
> Attachments: SOLR-7787.patch
>
>
> So fastutil is now part of Solr's distribution (because the stats component
> uses hyperloglog library, which in turn requires fastutil). I looked at the
> actual uses of fastutil and only java-hll uses it (and only a few classes).
> I've created a fork that uses HPPC instead (also randomized all tests, they
> pass). Since it's a relatively simple package I think it could be forked and
> imported into Solr's codebase entirely. I'd make a pull request but I see
> Hoss also created a few comments/ PRs and none of them received any
> attention; the project seems to be stale or dead?
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