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https://issues.apache.org/jira/browse/SOLR-5244?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein updated SOLR-5244:
---------------------------------
Description:
This ticket allows Solr to export full sorted result sets. The proposed syntax
is:
{code}
q=*:*&rows=-1&wt=xsort&fl=a,b,c&sort=a desc,b desc
{code}
Under the covers, the rows=-1 parameter will signal Solr to use the
ExportQParserPlugin as a RankQuery, which will simply collect a BitSet of the
results. The SortingResponseWriter will sort the results based on the sort
criteria and stream the results out.
This capability will open up Solr for a whole range of uses that will typically
done in using aggregation engines like Hadoop. For example:
*Large Distributed Joins*
A client outside of Solr calls two different Solr collections and returns the
results sorted by a join key. The client iterates through both streams and
performs a merge join.
*Fully Distributed Field Collapsing/Grouping*
A client outside of Solr makes individual calls to all the servers in a single
collection and returns results sort by the collapse key. The client merge joins
the sorted lists on the collapse key to perform the field collapse.
*High Cardinality Distributed Aggregation*
A client outside of Solr makes individual calls to all the servers in a single
collection and sorts on a high cardinality field. The client then merge joins
the sorted lists to perform the high cardinality aggregation.
In these scenarios Solr is being used as a distributed sorting engine.
Developers can write clients that take advantage of this sorting capability in
any way they wish.
was:
This ticket allows Solr to export full sorted result sets. The proposed syntax
is:
{code}
q=*:*&rows=-1&wt=xsort&fl=a,b,c&sort=a desc,b desc
{code}
Under the covers, the rows=-1 parameter will signal Solr to use the
ExportQParserPlugin as a RankQuery, which will simply collect a BitSet of the
results. The SortingResponseWriter will sort the results based on the sort
criteria and stream the results out.
This capability will open up Solr for a whole range of uses that will typically
done in using aggregation engines like Hadoop. For example
> Exporting Full Sorted Result Sets
> ---------------------------------
>
> Key: SOLR-5244
> URL: https://issues.apache.org/jira/browse/SOLR-5244
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 5.0
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Minor
> Fix For: 5.0, 4.10
>
> Attachments: 0001-SOLR_5244.patch, SOLR-5244.patch, SOLR-5244.patch
>
>
> This ticket allows Solr to export full sorted result sets. The proposed
> syntax is:
> {code}
> q=*:*&rows=-1&wt=xsort&fl=a,b,c&sort=a desc,b desc
> {code}
> Under the covers, the rows=-1 parameter will signal Solr to use the
> ExportQParserPlugin as a RankQuery, which will simply collect a BitSet of the
> results. The SortingResponseWriter will sort the results based on the sort
> criteria and stream the results out.
> This capability will open up Solr for a whole range of uses that will
> typically done in using aggregation engines like Hadoop. For example:
> *Large Distributed Joins*
> A client outside of Solr calls two different Solr collections and returns the
> results sorted by a join key. The client iterates through both streams and
> performs a merge join.
> *Fully Distributed Field Collapsing/Grouping*
> A client outside of Solr makes individual calls to all the servers in a
> single collection and returns results sort by the collapse key. The client
> merge joins the sorted lists on the collapse key to perform the field
> collapse.
> *High Cardinality Distributed Aggregation*
> A client outside of Solr makes individual calls to all the servers in a
> single collection and sorts on a high cardinality field. The client then
> merge joins the sorted lists to perform the high cardinality aggregation.
> In these scenarios Solr is being used as a distributed sorting engine.
> Developers can write clients that take advantage of this sorting capability
> in any way they wish.
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