rajanimaski created SOLR-8174:
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Summary: group.ngroups results are not returned when documents
indexed to same shard — with Document routing via composite keys
Key: SOLR-8174
URL: https://issues.apache.org/jira/browse/SOLR-8174
Project: Solr
Issue Type: Bug
Components: search, SolrCloud
Affects Versions: 5.3
Reporter: rajanimaski
System setup —
It’s a 2 sharded collection with Collection Name - anotherEtailSkus and the
two shard core names are : anotherEtailSkus_shard1_replica1,
anotherEtailSkus_shard2_replica1
The collection is created with the following http rest api
http://localhost:8983/solr/admin/collections?action=CREATE&name=anotherEtailSkus&numShards=2&replicationFactor=1&collection.configName=FileTest&maxShardsPerNode=2&router.name=compositeId
Sample Documents Indexed —
{"id":"125!1","groupedItemId_i":"1"}
{"id":"7!1","groupedItemId_i":"2"}
Problem Statement —
Now, with grouping paramters, on any shard with _route_ param the response of
group result is different. One of the shard returns group.ngroups and other
does not. Please find the attached screenshot and query for reference in
google doc link.
Group query on a shard with the change in shard core only.
http://localhost:8983/solr/anotherEtailSkus_shard2_replica1/select?q=*%3A*&fl=id,groupedItemId_i&wt=json&indent=true&group=true&group.format=simple&group.field=groupedItemId_i&group.ngroups=true&group.facet=true&_route_=125!
-----groups.ngroups are not returned in response
http://localhost:8983/solr/anotherEtailSkus_shard1_replica1/select?q=*%3A*&fl=id,groupedItemId_i&wt=json&indent=true&group=true&group.format=simple&group.field=groupedItemId_i&group.ngroups=true&group.facet=true&_route_=125!
----- group.ngroups are returned.
Document routing via composite key should have routed documents with same key
to same shards thus returning group results correctly— as per link [2]. But is
not the case.
Refer to the below google doc for detailed description.
https://docs.google.com/document/d/1g3M8sm0xGKJt5u26Qab6qawm5GgMzs58pe76uUoJQwk/edit?usp=sharing
[2]https://cwiki.apache.org/confluence/display/solr/Result+Grouping#ResultGrouping-DistributedResultGroupingCaveats
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