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https://issues.apache.org/jira/browse/SOLR-6526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14137372#comment-14137372
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Joel Bernstein commented on SOLR-6526:
--------------------------------------
The /export handler doesn't mesh with the full range of Solr features. It
wasn't designed to because it was built to support specific non-traditional
search use case. For example you can't change the response writer with it our
output facets. So it really is a different animal, having it's own request
handler makes that clear.
But the use cases that it does support are extremely important. And having this
feature available makes Solr much more powerful.
> Solr Streaming API
> ------------------
>
> Key: SOLR-6526
> URL: https://issues.apache.org/jira/browse/SOLR-6526
> Project: Solr
> Issue Type: New Feature
> Components: clients - java
> Reporter: Joel Bernstein
> Fix For: 5.0
>
> Attachments: SOLR-6526.patch
>
>
> It would be great if there was a SolrJ library that could connect to Solr's
> /export handler (SOLR-5244) and perform streaming operations on the sorted
> result sets.
> This ticket defines the base interfaces and implementations for the Streaming
> API. The base API contains three classes:
> *SolrStream*: This represents a stream from a single Solr instance. It speaks
> directly to the /export handler and provides methods to read() Tuples and
> close() the stream
> *CloudSolrStream*: This represents a stream from a SolrCloud collection. It
> speaks with Zk to discover the Solr instances in the collection and then
> creates SolrStreams to make the requests. The results from the underlying
> streams are merged inline to produce a single sorted stream of tuples.
> *Tuple*: The data structure returned by the read() method of the SolrStream
> API. It is nested to support grouping and Cartesian product set operations.
> Once these base classes are implemented it paves the way for building
> *Decorator* streams that perform operations on the sorted Tuple sets. For
> example a CollapseStream could be created:
> {code}
> CollapseStream collapseStream = new CollapseStream(new CloudSolrStream(zkUrl,
> queryRequest));
> Tuple tuple = null;
> while((tuple = collapseStream.read()) != null) {
> }
> {code}
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