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https://issues.apache.org/jira/browse/SOLR-9096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15278880#comment-15278880
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Joel Bernstein commented on SOLR-9096:
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I'm curious about the implementation. How do the workers receive the data? are
the streams pushed to the workers? or is it a callback?
> Add PartitionStream to Streaming Expressions
> --------------------------------------------
>
> Key: SOLR-9096
> URL: https://issues.apache.org/jira/browse/SOLR-9096
> Project: Solr
> Issue Type: New Feature
> Reporter: Dennis Gove
>
> The basic idea of a PartitionStream is to take a one or more input streams of
> tuples, partition them out to a set of workers such that each worker can work
> with a subset of the tuples, and then bring them all back into a single
> stream. This differs from a ParallelStream because in ParallelStream the data
> is partitioned at the source whereas with a PartitionStream one can take an
> existing stream and spread it out across workers.
> The use-case here is for when one has a source stream (or more) which cannot
> be parallelized at the source but which can be parallelized after some level
> of processing. I see this being used most for parallelized sort, rollups, or
> graph searches.
> {code}
> /--- sort ----\
> / \ /---
> Collection A
> / ---- sort ----- \ /
> Client <--- rollup <----< <----- innerJoin <
> \ ---- sort ----- / \
> \ / \---
> Collection B
> \--- sort ----/
> {code}
> {code}
> /--- sort -- rollup ----\
> / \
> /--- Collection A
> / ---- sort -- rollup ----- \ /
> Client <-- innerJoin <---< <----- innerJoin <
> \ \ ---- sort -- rollup ----- / \
> \ \ /
> \--- Collection B
> \ \--- sort -- rollup ----/
> \
> \
> \ <--- jdbc source
> {code}
> {code}
> /--- sort -- innerJoin ----\
> / \
> / ---- sort -- innerJoin ----- \ <--- jdbc source
> Client <-- innerJoin <---< |
> \ \ ---- sort -- innerJoin ----- / <--- rollup <----
> Collection A
> \ \ /
> \ \--- sort -- innerJoin ----/
> \
> \
> \ <--- jdbc source
> {code}
> I imagine partition expression would look something like this
> {code}
> partition(
> inputA=<source stream A>,
> inputB=<source stream B>,
> work=<stream for the workers>,
> over="fieldA,fieldB",
> workers=6,
> zkHost=<zk connection string>
> )
> {code}
> for example
> {code}
> innerJoin(
> partition(
> inputA=jdbc(database1),
> inputB=rollup(
> search(collectionA, ...),
> ...
> ),
> work=sort(
> innerJoin(
> inputA,
> inputB,
> on="fieldA,fieldB"
> ),
> by="jdbcFieldC asc, collectionAFieldB desc"
> ),
> workers=6,
> zkHost=localhost:12345
> ),
> jdbc(database2),
> on="fieldZ"
> )
> {code}
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