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https://issues.apache.org/jira/browse/SOLR-7787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dawid Weiss updated SOLR-7787:
------------------------------
    Summary: Fork HyperLogLog and remove fastutil dependency  (was: Promote 
fastutil to first-order dependency, remove HPPC (?))

> 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
>
>
> 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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