Using RAMDirectory really does not help performance. Java garbage collection has to work around all of the memory taken by the segments. It works out that Solr works better (for most indexes) without using the RAMDirectory.
On Sun, Jun 26, 2011 at 2:07 PM, nipunb <ni...@walmartlabs.com> wrote: > PS: Sorry if this is a repost, I was unable to see my message in the mailing > list - this may have been due to my outgoing email different from the one I > used to subscribe to the list with. > > Overview – Trying to evaluate if keeping the index in memory using > RAMDirectoryFactory can help in query performance.I am trying to perform the > indexing on the master using solr.StandardDirectoryFactory and make those > indexes accesible to the slave using solr.RAMDirectoryFactory > > Details: > We have set-up Solr in a master/slave enviornment. The index is built on the > master and then replicated to slaves which are used to serve the query. > The replication is done using the in-built Java replication in Solr. > On the master, in the <indexDefaults> of solrconfig.xml we have > <directoryFactory name="DirectoryFactory" > class="solr.StandardDirectoryFactory"/> > > On the slave, I tried to use the following in the <indexDefaults> > > <directoryFactory name="DirectoryFactory" > class="solr.RAMDirectoryFactory"/> > > My slave shows no data for any queries. In solrconfig.xml it is mentioned > that replication doesn’t work when using RAMDirectoryFactory, however this ( > https://issues.apache.org/jira/browse/SOLR-1379) mentions that you can use > it to have the index on disk and then load into memory. > > To test the sanity of my set-up, I changed solrconfig.xml in the slave to > and replicated: > <directoryFactory name="DirectoryFactory" > class="solr.StandardDirectoryFactory"/> > I was able to see the results. > > Shouldn’t RAMDirectoryFactory be used for reading index from disk into > memory? > > Any help/pointers in the right direction would be appreciated. > > Thanks! > > -- > View this message in context: > http://lucene.472066.n3.nabble.com/Using-RAMDirectoryFactory-in-Master-Slave-setup-tp3111792p3111792.html > Sent from the Solr - User mailing list archive at Nabble.com. > -- Lance Norskog goks...@gmail.com
