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https://issues.apache.org/jira/browse/SOLR-7535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gerlowski updated SOLR-7535:
----------------------------------
    Attachment: SOLR-7535.patch

Latest patch addresses 3 of Joel's concerns (see above):

1.) UpdateStream now extends TupleStream, instead of CloudSolrStream
2.) UpdateStream no longer commits on EOF.
3.) UpdateStream now takes a mandatory batchSize argument as a namedParameter.  
It reads batchSize tuples from the wrapped stream before sending them off.  It 
then spits out a tuple with a "uploadedDocs" parameter.

i.e. the stream now outputs data that looks like:
{code}
{"result-set":
    {"docs":[
        {"uploadedDocs":5},
        {"uploadedDocs":5},
        {"uploadedDocs":5},
        ....
        {"uploadedDocs":4,"EOF":true,"RESPONSE_TIME":146}]
    }
}
{code}

I thought a bit about making batchSize an optional parameter, and just using a  
reasonable default/fallback value when no value is provided.  But I decided 
against it, since this is probably something a user should be deciding for 
themselves.


Still no tests on this patch.  Running late for work, so I can't add them now.  
Hopefully that'll be a job for this evening.

> 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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