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https://issues.apache.org/jira/browse/SOLR-3088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203741#comment-13203741
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Mark Miller commented on SOLR-3088:
-----------------------------------
My thoughts are in line with what Yonik has said.
I only saw this issue as:
dummy entries get added to the collection state - eg if you start the first
node with -DnumShards=3, one real shard entry is added to the collection state
and two dummy entries. As Yonik says, now all searches will fail because the 2
dummy shards are not 'up' and the full collection is not available.
Again, as Yonik notes, a nice side effect is that you don't always have to pass
numShards = except perhaps in the future when you want to reshard if that ends
up making sense. Is it a little bit like storing the number of shards as you
where? Heh - I guess it is - though with the side affect of nodes being able to
see a full view of what shards should be in the collection right away (that is,
the info is in the clusterstate.json).
I've been leaning towards getting the req to pass numShards every time out
anyway having dealt with it for a while now. This seems like a slightly more
useful way to do it compared to just storing that value though. As long as the
system property would always update it, I never had much of a problem with
storing the value actually. I had been imagining you would trigger a re shard
by passing a new number - but I'm not even sure if that is how that will work
out.
Essentially though, everything would work as it does now - I'm not sure we need
to do anything in this issue?
> 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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