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https://issues.apache.org/jira/browse/SOLR-14275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrzej Bialecki resolved SOLR-14275.
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Resolution: Won't Fix
This implementation is EOL in Solr 8x.
> Policy calculations are very slow for large clusters and large operations
> -------------------------------------------------------------------------
>
> Key: SOLR-14275
> URL: https://issues.apache.org/jira/browse/SOLR-14275
> Project: Solr
> Issue Type: Bug
> Components: AutoScaling
> Affects Versions: 7.7.2, 8.4.1
> Reporter: Andrzej Bialecki
> Priority: Major
> Labels: scaling
> Attachments: SOLR-14275.patch, scenario.txt
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Replica placement calculations performed during collection creation take
> extremely long time (several minutes) when using a large cluster and creating
> a large collection (eg. 1000 nodes, 500 shards, 4 replicas).
> Profiling shows that most of the time is spent in
> {{Row.computeCacheIfAbsent}}, which probably doesn't reuse this cache as much
> as it should.
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