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https://issues.apache.org/jira/browse/SOLR-12798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16633241#comment-16633241
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Mikhail Khludnev commented on SOLR-12798:
-----------------------------------------

After thinking some time, I'd agree with [~noble.paul]. Params are supposed to 
be meta info, which is supposed to be short and more static. Whereas payload is 
big and changes everytime. Current manifold's approach (even we fix multiparts) 
doesn.t let to pass many docs with params attached to each other. Imho it 
proves design flaw. 
 [~daddywri] can you go ahead with ugly workaround and lately migrate to 
passing meta via fields?

> 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, 
> SOLR-12798-workaround.patch, SOLR-12798.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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