Joel Bernstein created SOLR-5244:
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Summary: Export search results
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
Priority: Minor
Fix For: 5.0
It would be great if Solr could efficiently export entire search result sets
without scoring or ranking documents. This would allow external systems to
perform rapid bulk imports from Solr. It also provides a possible platform for
exporting results to support distributed join scenarios within Solr.
This ticket provides a patch that has two pluggable components:
1) ExportQParserPlugin: which is a post filter that gathers a BitSet with
document results and does not delegate to ranking collectors. Instead it puts
the BitSet on the request context.
2) BinaryExportWriter: Is a output writer that iterates the BitSet and prints
the entire result as a binary stream. A header is provided at the beginning of
the stream so external clients can self configure.
Note:
These two components will be sufficient for a non-distributed environment.
For distributed export a new Request handler will need to be developed.
After applying the patch and building the dist or example, you can register the
components through the following changes to solrconfig.xml
Register export contrib libraries:
<lib dir="../../../dist/" regex="solr-export-\d.*\.jar" />
Register the "export" queryParser with the following line:
<queryParser name="export" class="org.apache.solr.export.ExportQParserPlugin"/>
Register the "xbin" writer:
<queryResponseWriter name="xbin"
class="org.apache.solr.export.BinaryExportWriter"/>
The following query will perform the export:
{code}
http://localhost:8983/solr/collection1/select?q=*:*&fq={!export}&wt=xbin&fl=join_i
{code}
Initial patch supports export of four data-types:
1) Single value trie int, long and float
2) Binary doc values.
The numerics are currently exported from the FieldCache and the Binary doc
values can be in memory or on disk.
Since this is designed to export very large result sets efficiently, stored
fields are not used for the export.
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