Jeff Wartes created SOLR-7493:
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Summary: Requests aren't distributed evenly if the collection
isn't present locally
Key: SOLR-7493
URL: https://issues.apache.org/jira/browse/SOLR-7493
Project: Solr
Issue Type: Bug
Components: SolrCloud
Affects Versions: 5.0
Reporter: Jeff Wartes
I had a SolrCloud cluster where every node is behind a simple round-robin load
balancer.
This cluster had two collections (A, B), and the slices of each were
partitioned such that one collection (A) used two thirds of the nodes, and the
other collection (B) used the remaining third of the nodes.
I observed that every request for collection B that the load balancer sent to a
node with (only) slices for collection A got proxied to one *specific* node
hosting a slice for collection B. This node started running pretty hot, for
obvious reasons.
This meant that one specific node was handling the fan-out for slightly more
than two-thirds of the requests against collection B.
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