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https://issues.apache.org/jira/browse/SOLR-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ravikanth Gangarapu updated SOLR-6439:
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Attachment: SOLR-6439.patch
> Delta Import does not work if cacheImpl attribute is set on entity
> ------------------------------------------------------------------
>
> Key: SOLR-6439
> URL: https://issues.apache.org/jira/browse/SOLR-6439
> Project: Solr
> Issue Type: Bug
> Components: contrib - DataImportHandler
> Affects Versions: 4.9
> Reporter: Ravikanth Gangarapu
> Priority: Minor
> Fix For: 5.0
>
> Attachments: SOLR-6439.patch
>
>
> Solr Delta Import process will fail while running deltaQuery and
> parentDeltaQuery queries throwing Class cast exceptions if cacheImpl
> attribute is set on entity. The problem is if cacheImpl is set, then
> EntityProcessorBase's initCache will instantiate DIHCacheSupport instance and
> during getNext() method, it will try to load from cacheLookUp based on
> cacheForeignKey. But, when in FIND_DELTA stage, we don't know the parent and
> we trying to find the parent. So, there is no reason to put/get the query
> results in cache as potentially the same deltaQuery is not run again. So,
> please fix the if condition to just go thru with rowiterator and get the
> deltaQuery results instead of the else condition with cache lookup etc.
> Another issue around the same feature is that, in solr community people (e.g.
> James Dyer) suggest to make the cacheImpl attribute value a variable so that
> variable resolves to a nice and shiny cache implementation class in
> full-import and on delta-import, we can make it empty ( e.g. controlling
> cache class name via custom request parameter). But, EntityProcessorBase
> doesn't check if cacheImpl class name is a non-empty string, just checks null
> and based on non-null value will try to instantiate an empty string class
> name.
> I am providing a patch. Please put them in next release as they are really
> simple fixes.
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