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https://issues.apache.org/jira/browse/SOLR-12798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16640511#comment-16640511
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Noble Paul edited comment on SOLR-12798 at 10/7/18 1:37 AM:
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We never supported JSON payloads from solrJ. For this format, we only support 
binary


was (Author: noble.paul):
We never supported binary payloads from solrJ. For this format, we only support 
binary

> 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, SOLR-12798.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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