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From "Mikhail Khludnev (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SOLR-9668) Support cursor paging in SolrEntityProcessor
Date Sun, 25 Dec 2016 20:22:58 GMT

     [ https://issues.apache.org/jira/browse/SOLR-9668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mikhail Khludnev reassigned SOLR-9668:
--------------------------------------

    Assignee: Mikhail Khludnev

> 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
>            Assignee: Mikhail Khludnev
>            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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