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https://issues.apache.org/jira/browse/SOLR-4816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667400#comment-13667400
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Joel Bernstein commented on SOLR-4816:
--------------------------------------

The main backwards compatibility issue that I see is the compound response. 
This patch returns a response that contains the responses from each of the 
shard requests. This is the main reason that I made the directUpdate 
functionality optional.

The exception handling seems to be backwards compatible.

A separate implementation makes sense too. The CloudSolrServer works fine for 
less demanding indexing needs. The ConcurrentCloudSolrServer could be used for 
higher throughput.

  
                
> 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.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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