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https://issues.apache.org/jira/browse/SOLR-4221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13694844#comment-13694844
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Yonik Seeley commented on SOLR-4221:
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bq. If I create the shard first and I don't have enough nodes to sign it to, it 
should probably just fail

Seems like it should be fine to create a shard w/ no current replicas (but it 
should also be fine to specify a certain minimum replication factor for the 
create to succeed).

As far as consistency with how collection creation works, I think we're going 
to need an additional parameter now that we can store the the replicationFactor 
in ZK and it can act as a target.  We need something like 
createReplicationFactor or something that specifies the minimum replication 
factor to achieve for the collection creation to succeed.

bq. Auto rebalancing should be an opt in thing , right?

It should certainly be optional/configurable.  What the default should be is a 
decision we can tackle once it's implemented.
                
> Custom sharding
> ---------------
>
>                 Key: SOLR-4221
>                 URL: https://issues.apache.org/jira/browse/SOLR-4221
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Yonik Seeley
>            Assignee: Noble Paul
>         Attachments: SOLR-4221.patch
>
>
> Features to let users control everything about sharding/routing.

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