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https://issues.apache.org/jira/browse/SOLR-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14235720#comment-14235720
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ASF subversion and git services commented on SOLR-4799:
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Commit 1643351 from [~jpountz] in branch 'dev/trunk'
[ https://svn.apache.org/r1643351 ]
SOLR-4799: Fix javadocs generation.
> DIH: join="zipper" aka merge join for nested EntityProcessors
> --------------------------------------------------------------
>
> Key: SOLR-4799
> URL: https://issues.apache.org/jira/browse/SOLR-4799
> Project: Solr
> Issue Type: New Feature
> Components: contrib - DataImportHandler
> Reporter: Mikhail Khludnev
> Assignee: Noble Paul
> Priority: Minor
> Labels: DIH, dataimportHandler, dih
> Fix For: 5.0, Trunk
>
> Attachments: SOLR-4799.patch, SOLR-4799.patch, SOLR-4799.patch,
> SOLR-4799.patch, SOLR-4799.patch
>
>
> DIH is mostly considered as a playground tool, and real usages end up with
> SolrJ. I want to contribute few improvements target DIH performance.
> This one provides performant approach for joining SQL Entities with miserable
> memory at contrast to
> http://wiki.apache.org/solr/DataImportHandler#CachedSqlEntityProcessor
> The idea is:
> * parent table is explicitly ordered by it’s PK in SQL
> * children table is explicitly ordered by parent_id FK in SQL
> * children entity processor joins ordered resultsets by ‘zipper’ algorithm.
> Do you think it’s worth to contribute it into DIH?
> cc: [~goksron] [~jdyer]
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