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https://issues.apache.org/jira/browse/SOLR-4799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13742992#comment-13742992
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Mikhail Khludnev commented on SOLR-4799:
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James,
I don't really understand. I wanted to add a tiny plugin into DIH, but
bq. I mean, make zipperjoin an option for any entity processor as opposed to
its own new variant on SqlE.P.
and after I went this way after heavy doubts
bq. As I said, I do not feel it wise to add features that won't neatly plug-in
the current DIH infrastructure until we improve the code.
Anyway, I absolutely share your concerns - DIH is a great idea, but it's worth
to revamp an engine. I have no experience with Flume, but I consider it as some
kind of transport. I want to look at Pentaho Kettle (kind of old school ETL
tool), Cloudera Morphlines.
> SQLEntityProcessor for zipper join
> ----------------------------------
>
> Key: SOLR-4799
> URL: https://issues.apache.org/jira/browse/SOLR-4799
> Project: Solr
> Issue Type: New Feature
> Components: contrib - DataImportHandler
> Reporter: Mikhail Khludnev
> Priority: Minor
> Labels: dih
> Attachments: 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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