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https://issues.apache.org/jira/browse/SOLR-9668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15591250#comment-15591250
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ASF GitHub Bot commented on SOLR-9668:
--------------------------------------
GitHub user YegorKozlov opened a pull request:
https://github.com/apache/lucene-solr/pull/101
SOLR-9668 Support cursor paging in SolrEntityProcessor
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:
```xml
<?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>
```
If the "sort" attribute is missing then the default start/rows pagination
is used.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/YegorKozlov/lucene-solr SOLR-9668
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/lucene-solr/pull/101.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #101
----
commit 840dfe68895fabdc8ff5458b3f114a678d0dd080
Author: U-CEB\YKozlov <[email protected]>
Date: 2016-10-20T08:34:55Z
SOLR-9668 Support cursor paging in SolrEntityProcessor
----
> 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
> Labels: dataimportHandler
> 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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