Hoss Man created SOLR-11942:
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Summary: need better ref guide docs on join (and grouping)
limitations in solr cloud
Key: SOLR-11942
URL: https://issues.apache.org/jira/browse/SOLR-11942
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: documentation
Reporter: Hoss Man
on irc, a user asked about joining in solr cloud and i realized that the
"JoinQParser" docs don't really clarify what does/doesn't work in cloud. There
is a section on "Joining Across Collections" which points out some limitations
in cloud mode, and the "Result Grouping" page has a brief note that "a...ll
documents in each group must be co-located on the same shard in order for
accurate counts to be returned. Document routing via composite keys can be a
useful solution in many situations." But there is no similar warning for using
the join parser n a single collection.
We should probably beef up the warning on the "Result Grouping" section to give
an example of what does/doesn't work, and cross link to that from the "join"
parser docs? (ie: "Note that when using multiple shards, the {{join}} parser
has similar limitations as {{the GroupComponent regarding co-located
documents|LINK_TO_OTHER_DOC}} )
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