Joel, Thanks for the explanation.
-- Yago Riveiro Sent with Sparrow (http://www.sparrowmailapp.com/?sig) On Friday, November 15, 2013 at 2:14 PM, Joel Bernstein wrote: > Yago, > > Now that I look back at this blog, I see how this can be confusing. > > This is how to breakdown the composite id: tenant1/4!docXXX > > "tenant1" is the shardkey. > > "/" is a separator between the shardkey and bits to use from the shardkey. > > "4" is the number of bits taken from the shardkey to create the composite > 32 bit hashcode. The other 28 bits come from the unique document ID. > > "!" separates the shardkey from the unique doc ID > > "docXXX" is the unique document ID > > This is taken from the blog: > > "This will take 4 bits from the shard key and 28 bits from the unique doc > id, spreading the tenant over 1/16th of the shards in the collection. > > 3 bits would spread the tenant over 1/8th of the collection. > 2 bits would spread the tenant over 1/4th of the collection. > 1 bit would spread the tenant over 1/2 the collection. > 0 bits would spread the tenant across the entire collection." > > > You do have to specify the bits at query time as well so Solr knows which > shards to query. > > Joel > > > > > > On Thu, Nov 14, 2013 at 10:46 AM, yriveiro <yago.rive...@gmail.com > (mailto:yago.rive...@gmail.com)> wrote: > > > Hi, > > > > I read this post > > http://searchhub.org/2013/06/13/solr-cloud-document-routing > > and I have some questions. > > > > When a tenant is too large to fit on one shard, we can specify the number > > of > > bit from the shardKey that we want to use. > > > > If we set a doc's key as "tenant1/4!docXXX" we are saying to spread the > > docs > > over the 1/4th of the collection. If the collection has 4 shards this means > > that all docs with the same shardKey will go to the same shard, or we will > > spread 25% in each shard? > > > > Other question is: at query time, we must configurate shardKeys param as > > "shard.keys=tenant1!" or as "shard.keys=tenant1/4!" > > > > /Yago > > > > > > > > ----- > > Best regards > > -- > > View this message in context: > > http://lucene.472066.n3.nabble.com/Document-routing-question-tp4100938.html > > Sent from the Solr - User mailing list archive at Nabble.com > > (http://Nabble.com). > > > > > > > -- > Joel Bernstein > Search Engineer at Heliosearch > >
