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https://issues.apache.org/jira/browse/SOLR-16524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17629357#comment-17629357
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Joel Bernstein commented on SOLR-16524:
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But its just very efficient to assign the hash partition at indexing time
because you already have the bytes. The basic filter query could used at query
time. It really goes much more towards Solr's strengths.
> Index time hash partitioning
> ----------------------------
>
> Key: SOLR-16524
> URL: https://issues.apache.org/jira/browse/SOLR-16524
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Joel Bernstein
> Priority: Major
>
> Both Streaming Expressions and Spark-Solr currently rely on query time hash
> partitioning using the HashQParserPlugin. The query time hash partitioning,
> although extremely flexible, is very slow when it builds its initial filters.
> This ticket will add an indexing time hash partitioner that Streaming
> Expressions and Spark-solr will both be able to use.
> When this ticket is complete I'll also update the ParallelStream and
> Spark-Solr to be able to use the index time partitioning rather than the
> HashQParserPlugin.
> This is a stepping stone towards much more performant parallel distributed
> joins.
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