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Date: Wed, 8 Feb 2012 20:44:59 +0000 (UTC)
From: "Mark Miller (Commented) (JIRA)" <jira@apache.org>
To: dev@lucene.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=13203966#comment-13203966 ] 

Mark Miller commented on SOLR-3088:
-----------------------------------

I've actually been working on that right now because I need it for a test I'm writing.

What I realized pretty much immediately was that I needed a way to pass that param down the chain so that the overseer eventually sees it. You should double check what I have done probably. What I found is that it seems only the overseer looks at the numShards sys prop - so it won't matter if its set on other nodes?

Anyway, what I settled for at the moment is, you can set the numShards on the cloud descriptor - its not stored, so you may not always get it back in the future, it's just a startup param. Then num_shards is also registered as part of the core state in zk - again it's only needed once though. This lets us specify numShards per core though - which is kind of what you need to support it in CoreAdminHandler.

Because the numShard will stay in the core_state, I'm not yet sure how that will work if you end up being able to reshard by starting a core with a different number...
                
> 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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