If you want to go from 2.0 to 2.1 and you are NOT using vnodes on your current cluster (that is version 2.0), then make sure you disable them on the new 2.1 config during the upgrade. Otherwise just leave the setting as is.
That's how I understand it personally. We are going to upgrade at some point so I'd appreciate if people could confirm that. On 23 Nov 2015 11:23 pm, "Sebastian Estevez" <[email protected]> wrote: > If your cluster does not use vnodes, disable vnodes in each new >> cassandra.yaml > > > If your cluster *does* use vnodes do *not* disable them. > > All the best, > > > [image: datastax_logo.png] <http://www.datastax.com/> > > Sebastián Estévez > > Solutions Architect | 954 905 8615 | [email protected] > > [image: linkedin.png] <https://www.linkedin.com/company/datastax> [image: > facebook.png] <https://www.facebook.com/datastax> [image: twitter.png] > <https://twitter.com/datastax> [image: g+.png] > <https://plus.google.com/+Datastax/about> > <http://feeds.feedburner.com/datastax> > <http://goog_410786983> > > > <http://www.datastax.com/gartner-magic-quadrant-odbms> > > DataStax is the fastest, most scalable distributed database technology, > delivering Apache Cassandra to the world’s most innovative enterprises. > Datastax is built to be agile, always-on, and predictably scalable to any > size. With more than 500 customers in 45 countries, DataStax is the > database technology and transactional backbone of choice for the worlds > most innovative companies such as Netflix, Adobe, Intuit, and eBay. > > On Mon, Nov 23, 2015 at 5:55 PM, Robert Wille <[email protected]> wrote: > >> I’m wanting to upgrade from 2.0 to 2.1. The upgrade instructions at >> http://docs.datastax.com/en/upgrade/doc/upgrade/cassandra/upgradeCassandraDetails.html >> has >> the following, which leaves me with more questions than it answers: >> >> If your cluster does not use vnodes, disable vnodes in each new >> cassandra.yaml before doing the rolling restart. >> In Cassandra 2.0.x, virtual nodes (vnodes) are enabled by default. >> Disable vnodes in the 2.0.x version before upgrading. >> >> 1. In the cassandra.yaml >> >> <http://docs.datastax.com/en/upgrade/doc/upgrade/cassandra/upgradeCassandraDetails.html#upgradeCassandraDetails__cassandrayaml_unique_7> >> file, >> set num_tokens to 1. >> 2. Uncomment the initial_token property and set it to 1 or to the >> value of a generated token >> >> <http://docs.datastax.com/en/cassandra/2.1/cassandra/configuration/configGenTokens_c.html> >> for >> a multi-node cluster. >> >> >> It seems strange that vnodes has to be disabled to upgrade, but whatever. >> If I use an initial token generator to set the initial_token property of >> each node, then I assume that my token ranges are all going to change, and >> that there’s going to be a whole bunch of streaming as the data is shuffled >> around. The docs don’t mention that. Should I wait until the streaming is >> done before proceeding with the upgrade? >> >> The docs don’t talk about vnodes and initial_tokens post-upgrade. Can I >> turn vnodes back on? Am I forever after stuck with having to have manually >> generated initial tokens (and needing to have a unique cassandra.yaml for >> every node)? Can I just set num_tokens = 256 and comment out initial_token >> and do a rolling restart? >> >> Thanks in advance >> >> Robert >> >> >
