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From David Boxenhorn <da...@lookin2.com>
Subject Re: Can't get data after building cluster
Date Tue, 01 Jun 2010 06:43:57 GMT
I don't think it can be the case that "at most data in the token range
assigned to that node will be affected" - the new node had no knowledge of
any of our data. Any fake "data" that it might have had through some error
on my part could not have been within the range of real data. I had 4.25 G
of data on the 1st server, and as far as I could tell I couldn't access any
of it.


On Tue, Jun 1, 2010 at 9:10 AM, Jonathan Ellis <jbellis@gmail.com> wrote:

> To elaborate:
>
> If you manage to screw things up to where it thinks a node has data,
> but it does not (adding a node without bootstrap would do this, for
> instance, which is probably what you did), at most data in the token
> range assigned to that node will be affected.
>
> On Tue, Jun 1, 2010 at 12:45 AM, David Boxenhorn <david@lookin2.com>
> wrote:
> > You say "no", but that is exactly what I just observed. Can I have some
> more
> > explanation?
> >
> > To recap: I added a server to my cluster. It had some junk in the
> > system/LocationInfo files from previous, unsuccessful attempts to add the
> > server to the cluster. (They were unsuccessful because I hadn't opened
> the
> > port on that computer.) When I finally succeeded in adding the 2nd
> server,
> > the 1st server started returning null when I tried to get data using the
> > CLI. I stopped the 2nd server, deleted the files in system, restarted,
> and
> > everything worked.
> >
> > I'm afraid that this, or some similar scenario will do the same, after I
> go
> > live. How can I protect myself?
> >
> > On Mon, May 31, 2010 at 10:10 PM, Jonathan Ellis <jbellis@gmail.com>
> wrote:
> >>
> >> No.
> >>
> >> On Mon, May 31, 2010 at 10:47 AM, David Boxenhorn <david@lookin2.com>
> >> wrote:
> >> > So.... this means that I can take my entire cluster off line if I make
> a
> >> > mistake adding a new server??? Yikes!
> >> >
> >> > On Mon, May 31, 2010 at 6:41 PM, David Boxenhorn <david@lookin2.com>
> >> > wrote:
> >> >>
> >> >> OK. Got it working.
> >> >>
> >> >> I had some data in the 2nd server from previous failed attempts at
> >> >> hooking
> >> >> up to the cluster. When I deleted that data and tried again, it said
> >> >> "bootstrapping" and my 1st server started working again.
> >> >>
> >> >> On Mon, May 31, 2010 at 4:50 PM, David Boxenhorn <david@lookin2.com>
> >> >> wrote:
> >> >>>
> >> >>> I am trying to get a cluster up and working for the first time.
> >> >>>
> >> >>> I got one server up and running, with lots of data on it, which
I
> can
> >> >>> see
> >> >>> with the CLI.
> >> >>>
> >> >>> I added my 2nd server, they seem to recognize each other.
> >> >>>
> >> >>> Now I can't see my data with the CLI. I do a get and it returns
> null.
> >> >>> The
> >> >>> data files seem to be intact.
> >> >>>
> >> >>> What happened??? How can I fix it?
> >> >>>
> >> >>
> >> >
> >> >
> >>
> >>
> >>
> >> --
> >> 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
>

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