Mikhail Khludnev created SOLR-18651:
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             Summary: warmup another collection via OtherSenderListener 
                 Key: SOLR-18651
                 URL: https://issues.apache.org/jira/browse/SOLR-18651
             Project: Solr
          Issue Type: Improvement
          Components: query
            Reporter: Mikhail Khludnev
            Assignee: Mikhail Khludnev


One of the weakest part of SOLR-18307 is concurrent cold hit. 

When we have new segment in from side, and to-side got a cold hit, it loads FK 
columns in from-side. But we load as many such columns as many concurrent 
queries (to-side) run. 

The proposal is to introduce QuerySendListener extension, which warms to-side 
on from-side commit. It's worth to cover there cases: 
 # ancient Solr - specify core name 
 # single shard from-collection, sharded to-collection
 # many-many shards collocated collections SOLR-16837   
AffinityPlacementFactory.withCollectionShards

bookmarking first slop [https://github.com/mkhludnev/solr/pull/34] not ready 
for looking into



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