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https://issues.apache.org/jira/browse/CONNECTORS-1533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16623781#comment-16623781
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Karl Wright commented on CONNECTORS-1533:
-----------------------------------------

I posted to [email protected] describing the problem, and committed a fix 
that allowed the integration test to pass.  Basically, if the URL required is 
more than 4000 characters, it will use multipart post.  Otherwise it will do 
whatever SolrJ wants.

I am still very concerned that there are a number of fixes we needed to add to 
SolrJ to make it work with our setup.  One case I know that will not work is 
the multipart form's name field, which cannot be transmitted to Solr Cell 
through a standard URL.  Thus my hack is going to break this functionality.  I 
expect it will impact folks like [~shinichiro abe], because they have relied on 
this in the past.  Unfortunately I know of no other workaround at this time, so 
the release will be postponed further until we find one.


> Solr Connector is unable to ingest documents
> --------------------------------------------
>
>                 Key: CONNECTORS-1533
>                 URL: https://issues.apache.org/jira/browse/CONNECTORS-1533
>             Project: ManifoldCF
>          Issue Type: Bug
>          Components: Lucene/SOLR connector
>    Affects Versions: ManifoldCF 2.11
>            Reporter: Julien Massiera
>            Assignee: Karl Wright
>            Priority: Major
>             Fix For: ManifoldCF 2.11
>
>
> The "r69acbd9 - Fix solr connector content deletion bug" has introduced 
> another bug : 
> It is now impossible to ingest documents into Solr 7.4.0, we obtain the 
> following error : Error from server at http://localhost:8983/solr/FileShare: 
> missing content stream
> The fact is, the requestWriter.getContentWriter(request) object is equal to 
> null only on commit requests. So the new lines of code introduced by the fix, 
> which are based on the test of this object, result in a null 
> Collection<ContentStream> streams object and so the update request is failing.
> Concerned class : 
> org.apache.manifoldcf.agents.output.solr.ModifiedHttpSolrClient



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