Tom Winch created SOLR-8234:
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Summary: Federated Search (new) - DJoin
Key: SOLR-8234
URL: https://issues.apache.org/jira/browse/SOLR-8234
Project: Solr
Issue Type: New Feature
Reporter: Tom Winch
Priority: Minor
Fix For: 4.10.3
This issue describes a MergeStrategy implementation to facilitate federated
search - that is, distributed search over documents stored in separated
instances of SOLR (for example, one server per continent), where a single
document (identified by an agreed, common unique id) may be stored in more than
one server instance, with (possibly) differing fields and data.
When the MergeStrategy is used in a request handler (via the included QParser)
in combination with distributed search (shards=), documents having an id that
has already been seen are not discarded (as per the default behaviour) but,
instead, are collected and returned as a group of documents all with the same
id taking a single position in the result set (this is implemented using
parent/child documents).
Documents are sorted in the result set based on the highest ranking document
with the same id. It is possible for a document ranking high in one shard to
rank very low on another shard. As a consequence of this, all shards must be
asked to return the fields of for every document id in the result set (not just
of those documents they returned), so that all the component parts of each
document in the search result set are returned.
This issue combines with others to provide full federated search support. See
also...
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Note that this is a new implementation of federated search as opposed to the
older issues SOLR-3799 to 3805.
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