The Cassandra wiki is notoriously out of date. The Datastax documentation is generally more correct on most things.
On Fri, Aug 1, 2014 at 9:27 AM, Donald Smith < donald.sm...@audiencescience.com> wrote: > According to datastax’s documentation at > http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_add_dc_to_cluster_t.html > > “By default, this setting [auto_bootstrap] is true and not listed in > the cassandra.yaml file.” > > > > But http://wiki.apache.org/cassandra/StorageConfiguration says: > > “Default is: 'false', so that new clusters don't bootstrap immediately. > You should turn this on when you start adding new nodes to a cluster that > already has data on it.” > > > > So which is correct? > > Also, the two pages disagree on the instructions on how to add new nodes > to an existing cluster. The first page says to set auto_boostrap to ‘ > *false’* when adding a new data center to a cluster. “Setting this > parameter to false prevents the new nodes from attempting to get all the > data from the other nodes in the data center. When you run nodetool > rebuild > <http://www.datastax.com/documentation/cassandra/2.0/cassandra/tools/toolsRebuild.html> > in the last step, each node is properly mapped.” > > > > The second page suggests setting auto_boostrap to ‘*true’* when you add > new nodes to an existing cluster: “You should turn this on when you start > adding new nodes to a cluster that already has data on it.” Perhaps that > applies only to new nodes to an existing data center (not a new data center > to an existing cluster). > > > > So, I’m not clear what I should do. I want to add a data center to an > existing cluster. If I set auto_bootstrap to true in the new nodes of the > new cluster, will it stream data from the other data centers? Perhaps it > will stream only NEW rows. Perhaps the purpose of doing “nodetool > rebuild” is to force streaming OLD data (like a repair). It’s not clear. > Maybe auto_bootstrap=true is equivalent to (auto_boostrap=false plus > “nodetool rebuild”). > > > > Thoughts? > > Don > > *Donald A. Smith* | Senior Software Engineer > P: 425.201.3900 x 3866 > C: (206) 819-5965 > F: (646) 443-2333 > dona...@audiencescience.com > > > [image: AudienceScience] > > > > > > *From:* Robert Coli [mailto:rc...@eventbrite.com] > *Sent:* Wednesday, July 16, 2014 12:31 PM > *To:* user@cassandra.apache.org > *Subject:* Re: adding more nodes into the cluster > > > > On Wed, Jul 16, 2014 at 12:28 PM, Robert Coli <rc...@eventbrite.com> > wrote: > > It applies whenever one is bootstrapping a node. One is bootstrapping a > node whenever one starts a node with auto_bootstrap set to "true" (the > default) and with either one-or-more tokens in initial_token or num_tokens > set. > > > > Ugh sorry : > > > > 1) starting a node > > 2) with auto_bootstrap:true (default) > > 3) initial_token or num_tokens populated > > 4) node has never successfully bootstrapped before, and has not therefore > written the information of its successful bootstrap to the system keyspace > > > > If the node has bootstrapped before, it will not do so again unless > replace_address is used. > > > > =Rob > > > > >
