Thanks all, I have three questions: 1. Must seed list be identical on all nodes ? 2. If one seed node crash, all node will communication with the failure seed node, I think this is harm for all nodes, isn't it？if this yes， how I can replace the failure seed node in all node?
2010/12/8 Jonathan Ellis <jbel...@gmail.com> > "Two seeds per datacenter" is my rule of thumb. > > On Tue, Dec 7, 2010 at 3:07 PM, Eric Gilmore <e...@riptano.com> wrote: > >> What would comprise a sane and reasonably balanced list? Should there be >> a certain proportion of seeds per total nodes? Any other considerations >> besides a) list must be identical on all nodes and b) you can't >> auto-bootstrap a seed node? >> >> I'm new to thinking about this setting, but it sounds like this discussion >> may be approaching some best-practice guidelines. >> >> >> On Tue, Dec 7, 2010 at 1:01 PM, Jonathan Ellis <jbel...@gmail.com> wrote: >> >>> The gossip-to-seed each round is to prevent cluster partitions, so if >>> you're following correct procedure and making every node's seed list >>> identical, then any potential new nodes gossiping to one of the old seeds >>> means it is still harmless for old nodes not to gossip to the new one until >>> the next restart. >>> >>> >>> On Tue, Dec 7, 2010 at 2:10 PM, Aaron Morton <aa...@thelastpickle.com>wrote: >>> >>>> Ryan, >>>> I've not checked with the code but the wiki docs for the Gossip Protocol >>>> say it makes use of the seed list. >>>> http://wiki.apache.org/cassandra/ArchitectureGossip >>>> >>>> During each gossip round a node will try to gossip to one seed node. >>>> >>>> Which made me think keeping the list sane and reasonably balanced was a >>>> good idea. Obviously would not matter too much on a small cluster though. >>>> >>>> Aaron >>>> >>>> >>>> On 08 Dec, 2010,at 07:16 AM, Ryan King <r...@twitter.com> wrote: >>>> >>>> Note that there's not really anything special about the seed node and >>>> its all relative�C the cluster doesn't necessarily have to agreed on who >>>> the >>>> seeds are. >>>> >>>> So, to bring up a new node to replace the old seed, just set the new >>>> node's seed to any existing node in the system. After that you can go back >>>> and make the setting consistent across the cluster. >>>> >>>> -ryan >>>> >>>> On Tue, Dec 7, 2010 at 7:01 AM, Nick Bailey <n...@riptano.com> wrote: >>>> >>>>> Yes, cassandra only reads the configuration when it starts up. However >>>>> seed nodes are only used when a node starts. After that they aren't >>>>> needed. >>>>> There should be no reason to restart your cluster after adding a seed node >>>>> to your cluster. >>>>> >>>>> >>>>> >>>>> On Tue, Dec 7, 2010 at 2:09 AM, aaron morton >>>>> <aa...@thelastpickle.com>wrote: >>>>> >>>>>> You will need to restart the nodes for them to pickup changes in >>>>>> cassandra.yaml >>>>>> >>>>>> >>>>>> Aaron >>>>>> >>>>>> >>>>>> On 7 Dec 2010, at 16:32, lei liu wrote: >>>>>> >>>>>> Thanks Nick. >>>>>> >>>>>> After I add the new node as seed node in the configuration for all of >>>>>> my nodes, do I need to restart all of my nodes? >>>>>> >>>>>> 2010/12/7 Nick Bailey <n...@riptano.com> >>>>>> >>>>>>> The node can be set as a seed node at any time. It does not need to >>>>>>> be a seed node when it joins the cluster. You should remove it as a seed >>>>>>> node, set autobootstrap to true and let it join the cluster. Once it has >>>>>>> joined the cluster you should add it as a seed node in the >>>>>>> configuration for >>>>>>> all of your nodes. >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Mon, Dec 6, 2010 at 9:59 AM, lei liu <liulei...@gmail.com> wrote: >>>>>>> >>>>>>>> Thank Jonathan for your reply. >>>>>>>> >>>>>>>> How can I bootstrap the node into cluster, I know if the node is >>>>>>>> seed node, I can't set AutoBootstrap to true. >>>>>>>> >>>>>>>> 2010/12/6 Jonathan Ellis <jbel...@gmail.com> >>>>>>>> >>>>>>>>> set it as a seed _after_ bootstrapping it into the cluster. >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Dec 6, 2010 at t5:01 AM, lei liu <liulei...@gmail.com> >>>>>>>>> wrote: >>>>>>>>> > After one seed node crash, I want to add one node as seed node, I >>>>>>>>> set >>>>>>>>> > auto_bootstrap to true, but the new node don't migrate data from >>>>>>>>> other >>>>>>>>> > node s. >>>>>>>>> > >>>>>>>>> > How can I add one new seed node and let the node to migrate data >>>>>>>>> from other >>>>>>>>> > nodes? >>>>>>>>> > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> > Thanks, >>>>>>>>> > >>>>>>>>> > LiuLei >>>>>>>>> > >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> -- >>>>>>>>> Jonathan Ellis >>>>>>>>> Project Chair, Apache Cassandra >>>>>>>>> co-founder of Riptano, the source for professional Cassandra >>>>>>>>> support >>>>>>>>> http://riptano.com >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>> >>> >>> -- >>> Jonathan Ellis >>> Project Chair, Apache Cassandra >>> co-founder of Riptano, the source for professional Cassandra support >>> http://riptano.com >>> >> >> >> >> -- >> *Eric Gilmore >> * >> Consulting Technical Writer >> Riptano, Inc. >> Ph: 510 684 9786 (cell) >> >> > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of Riptano, the source for professional Cassandra support > http://riptano.com >
