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Posted to dev@lucene.apache.org by "Joel Bernstein (JIRA)" <ji...@apache.org> on 2014/09/10 00:07:30 UTC
[jira] [Resolved] (SOLR-5244) Exporting Full Sorted Result Sets
[ https://issues.apache.org/jira/browse/SOLR-5244?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Joel Bernstein resolved SOLR-5244.
----------------------------------
Resolution: Fixed
> 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, SOLR-5244.patch, SOLR-5244.patch, SOLR-5244.patch, SOLR-5244.patch, SOLR-5244.patch
>
>
> This ticket allows Solr to export full sorted result sets. A new export request handler has been created that sets up the default writer type (SortingResponseWriter) and the required rank query (ExportQParserPlugin). The syntax is:
> {code}
> /solr/collection1/export?q=*:*&fl=a,b,c&sort=a desc,b desc
> {code}
> This capability will open up Solr for a whole range of uses that were typically done 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 sorted 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.
> *Large Scale Time Series Rollups*
> A client outside Solr makes individual calls to all servers in a collection and sorts on time dimensions. The client merge joins the sorted result sets and rolls up the time dimensions as it iterates through the data.
> 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.
> *Session Analysis and Aggregation*
> A client outside Solr makes individual calls to all servers in a collection and sorts on the sessionID. The client merge joins the sorted results and aggregates sessions as it iterates through the results.
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