Revise distributed code inside SearchComponents
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Key: SOLR-2778
URL: https://issues.apache.org/jira/browse/SOLR-2778
Project: Solr
Issue Type: Improvement
Reporter: Martijn van Groningen
The distributed code inside search components such as QueryComponent and
FacetComponent is complex. By structuring responsibilities
the code becomes less complex and easier to understand. There is already a
start for this that was part of distributed grouping (SOLR-2066).
The following concepts were developed inside QueryComponent for SOLR-2066:
* ShardRequestFactory is responsible for creating requests to shards in the
cluster based on the incoming request from the client.
* ShardResultTransformer. Transforming a NamedList response from the client in
for example SearchGroup or TopDocs instance.
* ShardResponseProcessor. Basically merges the shard responses. The
ShardReponseProcessor uses a ShardResultTransformer to transform the shard
response into a native structure (SearchGroup / TopGroups).
These concepts are now only used for distributed grouping, but I think can also
be used for non grouped distributed search.
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