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From Ted Dunning <>
Subject Re: SolrCloud logical shards
Date Thu, 14 Jan 2010 17:30:32 GMT
Logical shard sounds good as "the collection of all identical physical

Another concept from Katta that is AFAIK missing from the Solr lexicon is
the distinction between node and shard.  In Katta, a node is a server worker
instance that contains and queries physical shards.  There is usually one
node per physical server, but not always.  In Katta an important performance
and reliability optimization is that nodes do not contain identical shard
sets.  That is, shards are assigned randomly even when replicated.  This
improves robustness, code simplicity and load balancing.

On Thu, Jan 14, 2010 at 9:08 AM, Yonik Seeley <>wrote:

> Should we use logical shard for this, or does anyone have any better ideas?

Ted Dunning, CTO

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