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From Mark Miller <>
Subject Re: CloudSolrServer and update requests
Date Sun, 21 Apr 2013 23:19:27 GMT

- Mark

On Apr 21, 2013, at 1:28 PM, Timothy Potter <> wrote:

> Today is my day for conceptual questions ;-)
> From what I understand, CloudSolrServer is "smart" because it uses
> cluster state information pulled from Zookeeper to send update
> requests to leaders instead of replicas. This provides a slight
> benefit in that the update request will land on the correct leader 1/S
> times on avg. where S is the shard count, which is better than 1/N
> where N is the total node count in the cluster. The benefit increases
> as replication factor goes up.
> My question is whether the document ID-based routing logic could be
> done in CloudSolrServer too? It has the document ID right there in the
> request and knows the hash-ranges of each shard (from Zk).
> Any background information you can share on why routing is done on the
> server-side and not in CloudSolrServer? I understand that it would
> need to be done on the server too to support clients that don't have
> CloudSolrServer, but seems like a nice optimization to be able to do
> it on the client.
> Thanks.
> Tim

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