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https://issues.apache.org/jira/browse/SOLR-2358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123706#comment-13123706
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Mark Miller commented on SOLR-2358:
-----------------------------------

bq. Generally speaking, it seems like we should avoid locks as much as 
possible. Should be more scalable...

Yeah, I had the same initially reaction - a collection wide lock? Who likes 
locks? In reality, I'm not too worried though - its a simple very short lock 
for changing the cluster layout for a collection - this is not a normal thing 
that will happen - normally the cluster layout will be stable - this is mostly 
just as the cluster is coming up. So for simplicity and in the spirit of 
getting something working, it's easy to just start with a simple lock here - if 
it's really a problem (I doubt it myself), it's easy enough to do this 
differently later.
                
> Distributing Indexing
> ---------------------
>
>                 Key: SOLR-2358
>                 URL: https://issues.apache.org/jira/browse/SOLR-2358
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud, update
>            Reporter: William Mayor
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: SOLR-2358.patch
>
>
> The first steps towards creating distributed indexing functionality in Solr

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