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From "Mikhail Khludnev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3857) DIH: SqlEntityProcessor with "simple" cache broken
Date Thu, 20 Sep 2012 06:59:07 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459392#comment-13459392
] 

Mikhail Khludnev commented on SOLR-3857:
----------------------------------------

James,

Could you explain what can be actually cached in N+1 scenario (where xid=${x.id}) ? 
                
> DIH: SqlEntityProcessor with "simple" cache broken
> --------------------------------------------------
>
>                 Key: SOLR-3857
>                 URL: https://issues.apache.org/jira/browse/SOLR-3857
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 3.6.1, 4.0-BETA
>            Reporter: James Dyer
>
> The wiki describes a usage of CachedSqlEntityProcessor like this:
> {code:xml}
> <entity name="y" query="select * from y where xid=${x.id}" processor="CachedSqlEntityProcessor">
> {code}
> This creates what the code refers as a "simple" cache.  Rather than build the entire
cache up-front, the cache is built on-the-go.  I think this has limited use cases but it would
be nice to preserve the feature if possible.
> Unfortunately this was not included in any (effective) unit tests, and SOLR-2382 entirely
broke the functionality for 3.6/4.0-alpha+ .  At a first glance, the fix may not be entirely
straightforward.
> This was found while writing tests for SOLR-3856.

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