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https://issues.apache.org/jira/browse/SOLR-12798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16627674#comment-16627674
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David Smiley commented on SOLR-12798:
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[~arafalov] I believe this issue is about SolrJ (client-side), not the Solr
server.
[~kwri...@metacarta.com] why must ManifoldCF rely on HTTP Multipart in
particular – can't it compose a SolrInputDocument and just send it like
basically all Solr clients I've ever seen? Is the issue about the "infinite
length" content stream, which I presume maps to some sort of body text? Note
the existence of {{UpdateRequest.setDocIterator(Iterator<SolrInputDocument>)}}
which can be helpful in streaming and materializing documents on the fly.
> 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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