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https://issues.apache.org/jira/browse/SOLR-5944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14946831#comment-14946831
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Noble Paul commented on SOLR-5944:
----------------------------------

bq. If this doesn't match the prevVersion (case of an out of order update), 
wait (till a timeout) for the update with prevVersion to be written to 
tlog/index, possibly in other threads,
Looks like this needs to be nailed in more detail. What exactly happens to 
other writes when an out of order update reaches a replica?. Will the proposed 
change have any impact on the performance for users who do not use this feature?

bq.Don't reorder updates between leader and replicas: create a new 
ConcurrentUpdateSolrClient that uses a single channel and can return individual 
responses...

This is probably beyond the scope of this ticket. If the solution proposed by 
[~ichattopadhyaya] is fine (looks fine to me) we should go ahead with his 
solution and tackle the other stuff in a separate ticket. 

> Support updates of numeric DocValues
> ------------------------------------
>
>                 Key: SOLR-5944
>                 URL: https://issues.apache.org/jira/browse/SOLR-5944
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Ishan Chattopadhyaya
>            Assignee: Shalin Shekhar Mangar
>         Attachments: SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch, 
> SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch, 
> SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch, SOLR-5944.patch, 
> SOLR-5944.patch
>
>
> LUCENE-5189 introduced support for updates to numeric docvalues. It would be 
> really nice to have Solr support this.



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