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https://issues.apache.org/jira/browse/SOLR-4816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667129#comment-13667129
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Shawn Heisey commented on SOLR-4816:
------------------------------------

[~joel.bernstein] does the threading destroy the ability for the object to send 
throwables back up the stack, like ConcurrrentUpdateSolrServer and SOLR-3284?  
If it does, then I am -1 to that change in CloudSolrServer.  Some people 
(including me) rely on exceptions being thrown on update requests that do not 
include optimize or commit, so that behavior cannot be lost.  If you've found a 
way to have multiple threads without swallowing exceptions, then I'm +1 ... and 
please fix CUSS as well. :)

If you find that you can't have threading without a handleError method that 
eats the exception (like CUSS), then I'd rather you create 
ConcurrentCloudSolrServer instead and include a note about error handling in 
its javadoc.  I don't see a similar note in the javadoc for CUSS.

                
> Add "directUpdate" capability to CloudSolrServer
> ------------------------------------------------
>
>                 Key: SOLR-4816
>                 URL: https://issues.apache.org/jira/browse/SOLR-4816
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>    Affects Versions: 4.3
>            Reporter: Joel Bernstein
>            Priority: Minor
>         Attachments: SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, 
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, 
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, 
> SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, SOLR-4816.patch, 
> SOLR-4816.patch, SOLR-4816-sriesenberg.patch
>
>
> This issue changes CloudSolrServer so it can optionally route update requests 
> to the correct shard. This would be a nice feature to have to eliminate the 
> document routing overhead on the Solr servers.

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