Thanks for pointing out a mistake in the doc - that statement (for Search/Solr) was simply a leftover from before 4.6. Besides, it's in the Analytics section, which is not relevant for Search/Solr anyway.
-- Jack Krupansky On Mon, Feb 23, 2015 at 11:54 AM, Eric Stevens <migh...@gmail.com> wrote: > 30% overhead is pretty brutal. I think this is basic support for it, and > not necessarily a recommendation to use it. > > From > > http://www.datastax.com/documentation/datastax_enterprise/4.6/datastax_enterprise/ana/anaNdeOps.html?scroll=anaNdeOps__implicationsVnodes > > *DataStax does not recommend turning on vnodes *for other Hadoop use > cases *or for Solr nodes*, but you can use vnodes for any Cassandra-only > cluster, or a Cassandra-only data center in a mixed Hadoop/Solr/Cassandra > deployment. If you have enabled virtual nodes on Hadoop nodes, disable > virtual nodes before using the cluster. > > > On Mon, Feb 23, 2015 at 9:34 AM, Jack Krupansky <jack.krupan...@gmail.com> > wrote: > >> DSE 4.6 improved Solr vnode performance dramatically, so that vnodes for >> Search workloads is now no longer officially discouraged. As per the >> official doc for improvements, : "*Ability to use virtual nodes (vnodes) >> in Solr nodes. Recommended range: 64 to 256 (overhead increases by >> approximately 30%)*". A vnode token count of 64 or 32 would reduce that >> overhead further. And... the new 4.6 feature of being able to direct a Solr >> query to a specific partition essentially eliminates that overhead entirely. >> >> -- Jack Krupansky >> >> On Mon, Feb 23, 2015 at 11:23 AM, Eric Stevens <migh...@gmail.com> wrote: >> >>> Vnodes is officially disrecommended for DSE Solr integration (though a >>> small number isn't ruinous). That might be why they still don't enable them >>> by default. >>> On Feb 21, 2015 3:58 PM, "mck" <m...@apache.org> wrote: >>> >>>> At least the problem of hadoop and vnodes described in CASSANDRA-6091 >>>> doesn't apply to spark. >>>> (Spark already allows multiple token ranges per split). >>>> >>>> If this is the reason why DSE hasn't enabled vnodes then fingers crossed >>>> that'll change soon. >>>> >>>> >>>> > Some of the DataStax videos that I watched discussed how the >>>> Cassandra Spark connecter has >>>> > optimizations to deal with vnodes. >>>> >>>> >>>> Are these videos public? if so got any link to them? >>>> >>>> ~mck >>>> >>> >> >
