Solr data importhandler
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The DataImportHandler allows importing data from relational databases and XML into Solr. It supports both full and incremental ("delta") imports and allows denormalizing and transforming data through configuration. The handler is configured through data-config.xml and can be extended through custom transformers, entity processors, data sources, and event listeners.
Solr data importhandler
- 2. Introduction Imports data from RDBMS/XML into Solr using configuration Import works across multiple tables Data is denormalized Supports full and incremental update Allows to plugin components Is a contrib module
- 3. Full Import Indexes complete data to Solr command=full-import Updates the dataimport.properties
- 4. Delta Import Incremental Update command=delta-import Tables require additional column last_modified timestamp Relies on dataimport.properties file, which keeps the last indexed time
- 5. Configuration Steps Configure the DIH in SolrConfig.xml <requestHandler name="/dataimport" class="org.apache.solr.handler.dataimport.DataImportHandler"> <lst name="defaults"> <str name="config">/path/to/data-config.xml</str> </lst> </requestHandler> Configure the datasource and data-config.xml Add the dependencies to the lib directory
- 7. Transformers Modifies the value of a field or creates a new field altogether Transformers can be chained Some built-in transformer: RegexTransformer DateFormatTransformer TemplateTransformer HTMLStripTransformer
- 8. Custom Transformer Write your own transformer for custom processing before adding the row to Solr Extend Transform and override transformRow()
- 9. Questions
- 10. Thank You!