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Date: Wed, 8 Feb 2012 19:22:59 +0000 (UTC)
From: "Yonik Seeley (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (SOLR-3088) create shard placeholders
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    [ https://issues.apache.org/jira/browse/SOLR-3088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203867#comment-13203867 ] 

Yonik Seeley commented on SOLR-3088:
------------------------------------

The mental model I've had is that numShards is just an optional helper at collection creation time, and is largely meaningless after that point.  clusterstate is the system of record and contains all of the shards in a collection.
When shards are split in the future there will be a period of time when both the pre-split shard and the resulting post-split shards will coexist and overlap, and numShards as a collection property (rather than just a creation property) doesn't make sense.
If one is going to do custom sharding, then one would not use numShards, but simply add shards as needed (an example is shard-by-date, adding a new shard every week).
                
> create shard placeholders
> -------------------------
>
>                 Key: SOLR-3088
>                 URL: https://issues.apache.org/jira/browse/SOLR-3088
>             Project: Solr
>          Issue Type: New Feature
>          Components: SolrCloud
>            Reporter: Yonik Seeley
>             Fix For: 4.0
>
>
> When creating a new collection, a placeholder for each shard should be created.

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