Khush Jain created SOLR-17973:
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Summary: Cross Collection Join not respecting shards routing
preference
Key: SOLR-17973
URL: https://issues.apache.org/jira/browse/SOLR-17973
Project: Solr
Issue Type: Bug
Components: SolrCloud, streaming expressions
Affects Versions: 9.8.1, 9.9, 9.8, 9.6.1, 9.7, 9.6, 9.4.1, 9.5, 9.4, 9.2.1,
9.3, 9.1.1, 9.2, 9.1, 9.0
Reporter: Khush Jain
Configuration:
# Solr Cloud with Solr version 9.8
# All collections have 4 TLOG and 2 PULL
# Routing Override shards.preference=replica.leader:false
Cross Collection Join sends the query to all replicas (including leader). Cross
Collection Join Query is not respecting shards routing preference
[https://solr.apache.org/guide/solr/latest/deployment-guide/solrcloud-distributed
-requests.html#shards-preference-parameter]
It doesn't respect when joining between 2 collections with 1 shard each and
also when joining between 2 collections with 6 shards each. When checking the
source code for cross collection join, it uses Streaming expressions in its
implementation. Looks
like that does not respect routing preference
[https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/sear
ch/join/CrossCollectionJoinQuery.java#L286]
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