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https://issues.apache.org/jira/browse/SOLR-7535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15076420#comment-15076420
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Joel Bernstein commented on SOLR-7535:
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A couple of possible streams:
PartitionStream: writes to local disk partitioning on keys. Used when the next
stage does not require a re-sort.
ShuffleStream: writes to local disk sorting and partitioning by keys. Used when
the next stage requires a re-sort.
ReadStream: Gets passed a list of nodes to read a stream from. This would read
directly from worker nodes.
Step1:
parallel(partition(innerJoin(search, search)
Step 2:
parallel(hashJoin(read, search)
The PartitionStream would return a Tuple when it's finishing writing the
partitions that includes its node address. There would need to be a little glue
code that would gather the node addresses from step 1 and kick off step 2. This
could be written in any language. The SQLHandler will of course perform the
steps behind the scene.
> Add UpdateStream to Streaming API and Streaming Expression
> ----------------------------------------------------------
>
> Key: SOLR-7535
> URL: https://issues.apache.org/jira/browse/SOLR-7535
> Project: Solr
> Issue Type: New Feature
> Components: clients - java, SolrJ
> Reporter: Joel Bernstein
> Priority: Minor
> Attachments: SOLR-7535.patch, SOLR-7535.patch
>
>
> The ticket adds an UpdateStream implementation to the Streaming API and
> streaming expressions. The UpdateStream will wrap a TupleStream and send the
> Tuples it reads to a SolrCloud collection to be indexed.
> This will allow users to pull data from different Solr Cloud collections,
> merge and transform the streams and send the transformed data to another Solr
> Cloud collection.
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