[jira] [Created] (SOLR-4321) SolrCloud collection CREATE will put multiple master shards on a single node (and no shards on some)

["Brett Hoerner (JIRA)" <ji...@apache.org>]

Brett Hoerner created SOLR-4321:
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             Summary: SolrCloud collection CREATE will put multiple master shards on a single node (and no shards on some)
                 Key: SOLR-4321
                 URL: https://issues.apache.org/jira/browse/SOLR-4321
             Project: Solr
          Issue Type: Bug
          Components: SolrCloud
    Affects Versions: 4.1
            Reporter: Brett Hoerner


This is best described by a photo of my SolrCloud admin: http://i.imgur.com/hW4xnxy.png

I have a 4 node cluster, with shard count of 2 and replication factor of 2.

After running something like,

  http://localhost:8983/solr/admin/collections?action=CREATE&name=15724&numShards=2&replicationFactor=2

The shards seem to be completely randomly placed, which is fine, but some nodes receive more of the share than others (some even receiving none).

For example, 15724 has given node "backfill-1d" 2 "parts", 15724_shard1_replica2 and 15724_shard2_replica1 but has given "backfill-2d" nothing at all.

This creates unnecessary load on some nodes, no? Is this something I am supposed to handle myself (I looked, but don't see how).

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