Is nodetool removenode / decommission actually needed having a RF > 1 ? What does it do, exactly ?
Il giorno 19/mar/2013, alle ore 16:45, Alain RODRIGUEZ <arodr...@gmail.com> ha scritto: > In 1.2, you may want to use the nodetool removenode if your server i broken > or unreachable, else I guess nodetool decommission remains the good way to > remove a node. (http://www.datastax.com/docs/1.2/references/nodetool) > > When this node is out, rm -rf /yourpath/cassandra/* on this serveur, change > the configuration if needed (not sure about the auto_bootstrap param) and > start Cassandra on that node again. It should join the ring as a new node. > > Good luck. > > > 2013/3/19 Hiller, Dean <dean.hil...@nrel.gov> > Since you "cleared" out that node, it IS the replacement node. > > Dean > > From: Jabbar Azam <aja...@gmail.com<mailto:aja...@gmail.com>> > Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" > <user@cassandra.apache.org<mailto:user@cassandra.apache.org>> > Date: Tuesday, March 19, 2013 9:29 AM > To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" > <user@cassandra.apache.org<mailto:user@cassandra.apache.org>> > Subject: Re: Recovering from a faulty cassandra node > > Hello Dean. > > I'm using vnodes so can't specify a token. In addition I can't follow the > replace node docs because I don't have a replacement node. > > > On 19 March 2013 15:25, Hiller, Dean > <dean.hil...@nrel.gov<mailto:dean.hil...@nrel.gov>> wrote: > I have not done this as of yet but from all that I have read your best option > is to follow the replace node documentation which I belive you need to > > > 1. Have the token be the same BUT add 1 to it so it doesn't think it's the > same computer > 2. Have the bootstrap option set or something so streaming takes affect. > > I would however test that all out in QA to make sure it works and if you have > QUOROM reads/writes a good part of that test would be to take node X down > after your node Y is back in the cluster to make sure reads/writes are > working on the node you fixed…..you just need to make sure node X shares one > of the token ranges of node Y AND your writes/reads are in that token range. > > Dean > > From: Jabbar Azam > <aja...@gmail.com<mailto:aja...@gmail.com><mailto:aja...@gmail.com<mailto:aja...@gmail.com>>> > Reply-To: > "user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>" > > <user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>> > Date: Tuesday, March 19, 2013 8:51 AM > To: > "user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>" > > <user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>> > Subject: Recovering from a faulty cassandra node > > Hello, > > I am using Cassandra 1.2.2 on a 4 node test cluster with vnodes. I waited for > over a week to insert lots of data into the cluster. During the end of the > process one of the nodes had a hardware fault. > > I have fixed the hardware fault but the filing system on that node is corrupt > so I'll have to reinstall the OS and cassandra. > > I can think of two ways of reintegrating the host into the cluster > > 1) shrink the cluster to three nodes and add the node into the cluster > > 2) Add the node into the cluster without shrinking > > I'm not sure of the best approach to take and I'm not sure how to achieve > each step. > > Can anybody help? > > > -- > Thanks > > Jabbar Azam > > > > -- > Thanks > > Jabbar Azam > -- Marco Matarazzo == Hex Keep == W: http://www.hexkeep.com M: +39 347 8798528 E: marco.matara...@hexkeep.com "You can learn more about a man in one hour of play than in one year of conversation.” - Plato
