Mailing-List: contact cassandra-user-help@incubator.apache.org; run by ezmlm
Precedence: bulk
Reply-To: cassandra-user@incubator.apache.org
Received-SPF: pass (athena.apache.org: domain of jbellis@gmail.com designates
 209.85.219.209 as permitted sender)
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:from:date:message-id:subject:to
         :content-type:content-transfer-encoding;
        b=ZtSUlj+S94dqWQCKjUciQbdcoXIS8AhcN7wizcuzaK8jIv1a+1m2LWA3j/ZoetURtl
         91VfDavH8Z1BuN63oQUsIKnR1Myh3AGo3ziP+w9Uy19+QhLD+oWLH2q9m7ou9sC6aXA+
         ANKC03Vs0ftVnIeGbCKZuo/UaMDsxozGAxHtg=
MIME-Version: 1.0
In-Reply-To: <f05b8c590910281215p665296b2ma9b01ba18f047566@mail.gmail.com>
References: <f05b8c590910272110v61167206i9192768e67df2beb@mail.gmail.com>
	<e06563880910272202t2604bb00y6bcba8ef1d6eb910@mail.gmail.com>
	<f05b8c590910281215p665296b2ma9b01ba18f047566@mail.gmail.com>
From: Jonathan Ellis <jbellis@gmail.com>
Date: Wed, 28 Oct 2009 15:24:37 -0600
Message-ID: <e06563880910281424l3bcce38do66db114d118719bd@mail.gmail.com>
Subject: Re: on bootstrapping a node
To: cassandra-user@incubator.apache.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

On Wed, Oct 28, 2009 at 1:15 PM, Edmond Lau <edmond@ooyala.com> wrote:
> Sounds reasonable. =A0Until CASSANDRA-435 is complete, there's no way
> currently to take down a node and have it be removed from the list of
> nodes that's responsible for the data in its token range, correct?
> All other nodes will just assume that it's temporarily unavailable?

Right.

> Assume that we had the ability to permanently remove a node. =A0Would
> modifying the token on an existing node and restarting it with
> bootstrapping somehow be incorrect, or merely not performant b/c we'll
> be performing lazy repair on most reads until the node is up to date?

If you permanently remove a node, wipe its data directory, and restart
it, it's effectively a new node, so everything works fine.  If you
don't wipe its data directory it won't bootstrap (and it will ignore a
new token in the configuration file in favor of the one it stored in
the system table) since it will say "hey, I must have crashed and
restarted.  Here I am again guys!"

Bootstrap is for new nodes.  Don't try to be too clever. :)

> if I wanted to
> migrate my cluster to a completely new set of machines. =A0I would then
> bootstrap all the new nodes in the new cluster, and then decommission
> my old nodes one by one (assuming
> https://issues.apache.org/jira/browse/CASSANDRA-435 was done). =A0After
> the migration, all my nodes would've been bootstrapped.

Sure.

-Jonathan