George Leotescu created SOLR-11186:
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Summary: MultiQuery Search component
Key: SOLR-11186
URL: https://issues.apache.org/jira/browse/SOLR-11186
Project: Solr
Issue Type: Task
Security Level: Public (Default Security Level. Issues are Public)
Reporter: George Leotescu
Priority: Minor
This patch is for contributing a request handler and search component that will
allow us to perform multiple queries in one unique request. The issue has been
tackled in the past by SOLR-1093 but never integrated into Solr.
h2. Setup
In order to use the request handler the user will have to specify in the
{{solrconfig.xml}} something like:
{code}
<requestHandler name="/multi" class="solr.MultiRequestHandler"/>
{code}
h2. Query Syntax
The request handler will support the following syntax:
{code:xml}
/select?mq=hello&mq=world&mq=solr&rows=2&fq=...
{code}
the response will be:
{code:xml}
{
"responseHeader": {
"status": 0,
"QTime": 58
},
"response": [
{
"numFound": 10,
"start": 0,
"mq": "hello",
"docs": [
{
...
},
{
"numFound": 57,
"start": 0,
"mq": "world",
"docs": [
...
]
{
"numFound": 34,
"start": 0,
"mq": "solr",
"docs": [
...
],
}
{code}
h2. Performance
The query will be optimized for the distributed setting, so that the network
requests between the federator and the shards are the same used to perform a
normal query.
We also plan to support group queries (extending the {{QueryComponent}} in
order to avoid extra network communications)
h2. Misc
The usual parameters ({{rows}}, {{start}}, {{fq}}, {{sort}}) will be in common
and applied to all the queries.
We would like to release the request handler in a separate contrib package.
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