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https://issues.apache.org/jira/browse/SOLR-12798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16629971#comment-16629971
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Jan Høydahl commented on SOLR-12798:
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If I understand correctly, you now have a choice in MCF whether to
# Stream the original binary document to Solr's extracting request handler and
use Solr's built-in Tika to parse it.
In this case there will NOT be a problem since you won't have much metadata as
request params, just the few you would have configured statically
# Let MCF do the Tika conversion using Tika Content Extractor
([https://manifoldcf.apache.org/release/release-1.10/en_US/end-user-documentation.html#tikaextractor)
I|https://manifoldcf.apache.org/release/release-1.10/en_US/end-user-documentation.html#tikaextractor)]n
this case MCF will have all the various metadata parsed from the docs, that it
may want to send to Solr, alongside the plain-text parsed version of the
document.
For 1) you don't have an issue, as you send the binary stream to /extract
endpoint.
For 2) I wonder why you use {{/extract}} at all, since Tika has already been
invoked on the MCF side. This seems like an anti-pattern. The best way would be
to construct a SolrInputDocument on where each {{literal.xyz}} params becomes a
separate {{xyz}} field, and where the text body is put into a {{content}} field
(configurable) and everything is sent to {{/update}} as opposed to
{{/extract}}. In the case of jpg files the body text would of course be empty
as there is only metadata to be indexed.
> 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-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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