Thanks Shawn. Just to make the picture more clear, I'm trying to understand why a 3 node solrcloud cluster and a old style solr server take same time to index same documents.
But in the wiki is written: If the machine is a leader, SolrCloud determines which shard the document > should go to, forwards the document the leader for that shard, indexes the > document for this shard, and *forwards the index notation to itself and > any replicas*. https://cwiki.apache.org/confluence/display/solr/Shards+and+Indexing+Data+in+SolrCloud Could you please explain what does it mean "forwards the index notation" ? On the other hand, on solrcloud I have 3 shards and 2 replicas for each shard. So, every node is indexing all the documents and this explains why solrcloud consumes same time compared to an old-style solr server. On Thu, May 7, 2015 at 3:08 PM, Shawn Heisey <apa...@elyograg.org> wrote: > On 5/7/2015 3:04 AM, Vincenzo D'Amore wrote: > > Thanks Erick. I'm not sure I got your answer. > > > > I try to recap, when the raw document has to be indexed, it will be > > forwarded to shard leader. Shard leader indexes the document for that > > shard, and then forwards the indexed document to any replicas. > > > > I want just be sure that when the raw document is forwarded from the > leader > > to the replicas it will be indexed only one time on the shard leader. > From > > what I understand replicas do not indexes, only the leader indexes. > > The document is indexed by all replicas. There is no way to forward the > indexed document, it can only forward the source document ... so each > replica must index it independently. > > The old-style master-slave replication (which existed long before > SolrCloud) copies the finished Lucene segments, so only the master > actually does indexing. > > SolrCloud doesn't have a master, only multiple replicas, one of which is > elected leader, and replication only comes into the picture if there's a > serious problem and Solr determines that it can't use the transaction > log to recover the index. > > Thanks, > Shawn > > -- Vincenzo D'Amore email: v.dam...@gmail.com skype: free.dev mobile: +39 349 8513251
