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https://issues.apache.org/jira/browse/SOLR-14636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17156478#comment-17156478
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Mark Robert Miller commented on SOLR-14636:
-------------------------------------------

Oh man, I had forgotten this one sort of. Full memory restored. So, fun fact, 
Solr tests allocate tremendous amounts of garbage on the heap, tremendous. Like 
huge. GC keeps up, it’s no killer, but hundreds of megabytes and gigabytes - 
and the kicker is, 99% of that is generated in non test code and oh by the way 
not like most of them (almost all of them)are necessary or useful at all.

> Provide a reference implementation for SolrCloud that is stable and fast.
> -------------------------------------------------------------------------
>
>                 Key: SOLR-14636
>                 URL: https://issues.apache.org/jira/browse/SOLR-14636
>             Project: Solr
>          Issue Type: Task
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Mark Robert Miller
>            Assignee: Mark Robert Miller
>            Priority: Major
>
> SolrCloud powers critical infrastructure and needs the ability to run quickly 
> with stability. This reference implementation will allow for this.
> *location*: [https://github.com/apache/lucene-solr/tree/reference_impl]
> *status*: alpha
> *speed*: ludicrous
> *tests***:
>  * *core*: passing with ignores (not solid*)
>  * *solrj*: passing with ignores (not solid*)
>  * *test-framework*:  passing with ignores (not solid*)
>  * *contrib/analysis-extras*:  passing with ignores (not solid*)
>  * *contrib/analytics*:  passing with ignores (not solid*)
>  * *contrib/clustering*:  passing with ignores (not solid*)
>  * *contrib/dataimporthandler*:  passing with ignores (not solid*)
>  * *contrib/dataimporthandler-extras*:  passing with ignores (not solid*)
>  * *contrib/extraction*:  passing with ignores (not solid*)
>  * *contrib/jaegertracer-configurator*:  passing with ignores (not solid*)
>  * *contrib/langid*:  passing with ignores (not solid*)
>  * *contrib/prometheus-exporter*:  passing with ignores (not solid*)
>  * *contrib/velocity*:  passing with ignores (not solid*)
> _* Running tests quickly and efficiently with strict policing will more 
> frequently find bugs and requires a period of hardening._
>  _** Non Nightly currently, Nightly comes last._



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