Yegor Kozlov created SOLR-9668:
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Summary: Support cursor paging in SolrEntityProcessor
Key: SOLR-9668
URL: https://issues.apache.org/jira/browse/SOLR-9668
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: contrib - DataImportHandler
Reporter: Yegor Kozlov
Priority: Minor
Fix For: master (7.0)
SolrEntityProcessor paginates using the start and rows parameters which can be
very inefficient at large offsets. In fact, the current implementation is
impracticable to import large amounts of data (10M+ documents) because the data
import rate degrades from 1000docs/second to 10docs/second and the import gets
stuck.
This patch introduces support for cursor paging which offers more or less
predictable performance. In my tests the time to fetch the 1st and 1000th pages
was about the same and the data import rate was stable throughout the entire
import.
To enable cursor paging a user needs to add a "sort" attribute in the entity
configuration:
{code}
<?xml version="1.0" encoding="UTF-8" ?>
<dataConfig>
<document>
<entity name="se" processor="SolrEntityProcessor"
query="*:*"
rows="1000"
sort="id asc" <!-- turns on cursor paging. Must be a uniqueKey field tie
breaker -->
url="http://localhost:8983/solr/collection1";>
</entity>
</document>
</dataConfig>
{code}
If the "sort" attribute is missing then the default start/rows pagination is
used.
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