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https://issues.apache.org/jira/browse/SOLR-7787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14624673#comment-14624673
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Dawid Weiss commented on SOLR-7787:
-----------------------------------
I also looked at HLL's implementation, it uses fastutil for fairly simple stuff
and it's essentially one class. The iterators don't make much sense to me as
they use intermediate autoboxing.
> Promote fastutil to first-order dependency, remove HPPC (?)
> -----------------------------------------------------------
>
> 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
>
>
> So fastutil is now part of Solr's distribution (because the stats component
> uses hyperloglog library, which in turn requires fastutil). There are a few
> classes that use HPPC but these could be rewritten to use fastutil, thus
> saving a few MBs of the distribution size.
> Going the other way would be more attractive size-wise (HPPC is ~1.1MB,
> fastutil is ~17MB) but we have no control over HLL's dependencies.
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