incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Henrik Schröder <skro...@gmail.com>
Subject Re: Unicode key encoding problem when upgrading from 0.6.13 to 0.7.5
Date Wed, 04 May 2011 15:41:50 GMT
Those few hundred duplicated rows turned out to be a HUGE problem, the
automatic compaction started throwing errors that "Keys must be written in
ascending order.", and successive failing compactions started to fill the
disk until it ran out of diskspace which was a bit sad.

Right now we're trying to figure out how to remove the rows that get
corrupted by upgrading, hopefully it can be solved.


/Henrik Schröder

On Tue, May 3, 2011 at 17:19, Henrik Schröder <skrolle@gmail.com> wrote:

> The way we solved this problem is that it turned out we had only a few
> hundred rows with unicode keys, so we simply extracted them, upgraded to
> 0.7, and wrote them back. However, this means that among the rows, there are
> a few hundred weird duplicate rows with identical keys.
>
> Is this going to be a problem in the future? Is there a chance that the
> good duplicate is cleaned out in favour of the bad duplicate so that we
> suddnely lose those rows again?
>
>
> /Henrik Schröder
>

Mime
View raw message