On 4/12/2013 7:17 AM, vicky desai wrote:
and solr fails to start . However if i add updatelog in my solrconfig.xml it starts. Is the update log parameter mandatory for solr4.2
You are using SolrCloud. SolrCloud requires both updateLog and replication to be enabled. As you probably know, updateLog requires the presence of a _version_ field, see the example schema for the full definition of that field.
If you are using Solr without SolrCloud, these features are not required. The updateLog is recommended for all 4.x installs because NRTCachingDirectoryFactory is now the default. The way I understand it, with that Directory implementation, part of an update may not be persisted to disk even with a hard commit, so the updateLog is needed to ensure the data won't be lost.
Thanks, Shawn
