incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: Recovering from a faulty cassandra node
Date Tue, 19 Mar 2013 15:45:36 GMT
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.Hiller@nrel.gov>

> Since you "cleared" out that node, it IS the replacement node.
>
> Dean
>
> From: Jabbar Azam <ajazam@gmail.com<mailto:ajazam@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.Hiller@nrel.gov<mailto:
> Dean.Hiller@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 <ajazam@gmail.com<mailto:ajazam@gmail.com><mailto:
> ajazam@gmail.com<mailto:ajazam@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
>

Mime
View raw message