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https://issues.apache.org/jira/browse/SOLR-12798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16625558#comment-16625558
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Karl Wright commented on SOLR-12798:
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We're researching the actual issue that is blocking release.  It seems that 
deleting documents using a Solr Cloud installation may not be working; for each 
document, we're seeing a 400 error with the following message: 

Error from server at http://localhost:8983/solr/FileShare_shard1_replica_n1: 
missing content stream: Error from server at 
http://localhost:8983/solr/FileShare_shard1_replica_n1: missing content stream

Furthermore, after checking the Solr index, none of the documents have been 
removed.
This is obviously severe and we're trying now to confirm that this happens 
without our modifications to HttpSolrClient.



> 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: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrJ
>    Affects Versions: 7.4
>            Reporter: Karl Wright
>            Priority: Major
>
> 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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