Hi Jack; You said: "An hour from now some other replica may be the leader"
What is the criteria to change a leader of a shard? 2013/4/15 Jack Krupansky <j...@basetechnology.com> > All nodes are replicas in SolrCloud since there are no masters. It's a > fully distributed model. A leader is also a replica. A leader is simply a > replica which was elected to be a leader, for now. An hour from now some > other replica may be the leader. > > It is indeed misleading and inaccurate to suggest that "leader" and > "replicas" are disjoint. > > Once again, I think you are confusing SolrCloud with the older Solr > master/slave/replication. > > Every node in SolrCloud can do indexing. That's the same as saying that > every replica in SolrCloud can do indexing. > > Although we do need to be clear that a given replica will only index > documents for the shard(s) to which it belongs. > > > -- Jack Krupansky > > -----Original Message----- From: Furkan KAMACI > Sent: Monday, April 15, 2013 9:38 AM > To: solr-user@lucene.apache.org > Subject: Re: SolrCloud Leaders > > Here writes something: > > https://support.lucidworks.com/entries/22180608-Solr-HA-DR-overview-3-x-and-4-0-SolrCloud-and > > says: > > Both leaders and replicas index items and perform searches. > > How replicas index items? > > > 2013/4/15 Furkan KAMACI <furkankam...@gmail.com> > > Does leaders may response search requests (I mean do they store indexes) >> at when I run SolrCloud at first and after a time later? >> >> >> 2013/4/15 Jack Krupansky <j...@basetechnology.com> >> >> When the cluster is fully operational, yes. But if part of the cluster is >>> down or split and unable to communicate, or leader election is in >>> progress, >>> the actual count of leaders will not be indicative of the number of >>> shards. >>> >>> Leaders and shards are apples and oranges. If you take down a cluster, by >>> definition it would have no leaders (because leaders are running code), >>> but >>> shards are the files in the index on disk that continue to exist even if >>> the code is not running. So, in the extreme, the number of leaders can be >>> zero while the number of shards is non-zero on disk. >>> >>> -- Jack Krupansky >>> >>> -----Original Message----- From: Furkan KAMACI >>> Sent: Monday, April 15, 2013 8:21 AM >>> To: solr-user@lucene.apache.org >>> Subject: SolrCloud Leaders >>> >>> >>> Does number of leaders at a SolrCloud is equal to number of shards? >>> >>> >> >> >
