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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: drop/recreate column family race condition
Date Tue, 07 Sep 2010 21:10:34 GMT
On Tue, Sep 7, 2010 at 3:55 PM, B. Todd Burruss <bburruss@real.com> wrote:
> using 0.7 latest from trunk as of few minutes ago.  1 client, 1 node
>
> i have the scenario where i want to drop a column family and recreate it -
> unit testing for instance, is a good reason you may want to do this (always
> start fresh).
>
> the problem i observe is that if i do the following:
>
> 1 - drop the column family
> 2 - recreate it
> 3 - read data from a key that existed before dropping, but doesn't exist now
>
> if those steps happen fast enough, i will get the old row - definitely no
> good.

old rows can appear until the drop is complete.  as you're aware, this
is part of the design.

> if they happen slow enough, get_slice throws:

this is definitely a bug.  Can you open a ticket?

BTW, is there a reason you're not using truncate instead of
drop/recreate?  It's lighter-weight since it doesn't have to do a
schema migration.

-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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