On Mon, Sep 6, 2010 at 10:18 AM, MitchK <mitc...@web.de> wrote: [...consistent hashing...] > But it doesn't solve the problem at all, correct me if I am wrong, but: If > you add a new server, let's call him IP3-1, and IP3-1 is nearer to the > current ressource X, than doc x will be indexed at IP3-1 - even if IP2-1 > holds the older version. > Am I right?
Right. You still need code to handle migration. Consistent hashing is a way for everyone to be able to agree on the mapping, and for the mapping to change incrementally. i.e. you add a node and it only changes the docid->node mapping of a limited percent of the mappings, rather than changing the mappings of potentially everything, as a simple MOD would do. For SolrCloud, I don't think we'll end up using consistent hashing - we don't need it (although some of the concepts may still be useful). -Yonik http://lucenerevolution.org Lucene/Solr Conference, Boston Oct 7-8
