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https://issues.apache.org/jira/browse/SOLR-12798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16631107#comment-16631107
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Jan Høydahl commented on SOLR-12798:
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{quote}How do you suggest we handle binary data that is meant for SolrCell?
{quote}
That would be for case 1) where  you don't do Tika stuff on the MCF side but 
want Solr to handle the binary stream. In this case there should be no problem 
with huge metadata request params. And I agree that SolrJ should support this 
case ({{ContentStreamUpdateRequest}}?). I got confused by your other use case 
where you parse the file with Tika on the MCF side and still sent the text to 
/extract.

As I understand, this Jira issue is really mainly about the classic use case 
where you do NOT invoke Tika on client side but stream binary content to 
SolrCell and still need some Url parameters, and doing this in SolrJ is broken 
somehow. In this case there will NOT be huge metadata to pass as URL 
parameters, right?

> Structural changes in SolrJ since version 7.0.0 have effectively disabled 
> multipart post
> ----------------------------------------------------------------------------------------
>
>                 Key: SOLR-12798
>                 URL: https://issues.apache.org/jira/browse/SOLR-12798
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrJ
>    Affects Versions: 7.4
>            Reporter: Karl Wright
>            Assignee: Karl Wright
>            Priority: Major
>         Attachments: HOT Balloon Trip_Ultra HD.jpg, 
> SOLR-12798-approach.patch, SOLR-12798-reproducer.patch, no params in url.png, 
> solr-update-request.txt
>
>
> Project ManifoldCF uses SolrJ to post documents to Solr.  When upgrading from 
> SolrJ 7.0.x to SolrJ 7.4, we encountered significant structural changes to 
> SolrJ's HttpSolrClient class that seemingly disable any use of multipart 
> post.  This is critical because ManifoldCF's documents often contain metadata 
> in excess of 4K that therefore cannot be stuffed into a URL.
> The changes in question seem to have been performed by Paul Noble on 
> 10/31/2017, with the introduction of the RequestWriter mechanism.  Basically, 
> if a request has a RequestWriter, it is used exclusively to write the 
> request, and that overrides the stream mechanism completely.  I haven't 
> chased it back to a specific ticket.
> ManifoldCF's usage of SolrJ involves the creation of 
> ContentStreamUpdateRequests for all posts meant for Solr Cell, and the 
> creation of UpdateRequests for posts not meant for Solr Cell (as well as for 
> delete and commit requests).  For our release cycle that is taking place 
> right now, we're shipping a modified version of HttpSolrClient that ignores 
> the RequestWriter when dealing with ContentStreamUpdateRequests.  We 
> apparently cannot use multipart for all requests because on the Solr side we 
> get "pfountz Should not get here!" errors on the Solr side when we do, which 
> generate HTTP error code 500 responses.  That should not happen either, in my 
> opinion.



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