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From Joost Ouwerkerk <jo...@openplaces.org>
Subject Re: Cassandra reverting deletes?
Date Tue, 27 Apr 2010 21:20:37 GMT
Hmm... Even after deleting with cl.ALL, I'm getting data back for some
rows after having deleted them.  Which rows return data is
inconsistent from one run of the job to the next.

On Tue, Apr 27, 2010 at 1:44 PM, Joost Ouwerkerk <joost@openplaces.org> wrote:
> To check that rows are gone, I check that KeySlice.columns is empty.  And as
> I mentioned, immediately after the delete job, this returns the expected
> number.
> Unfortunately I reproduced with QUORUM this morning.  No node outages.  I am
> going to try ALL to see if that changes anything, but I am starting to
> wonder if I'm doing something else wrong.
> On Mon, Apr 26, 2010 at 9:45 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
>>
>> How are you checking that the rows are gone?
>>
>> Are you experiencing node outages during this?
>>
>> DC_QUORUM is unfinished code right now, you should avoid using it.
>> Can you reproduce with normal QUORUM?
>>
>> On Sat, Apr 24, 2010 at 12:23 PM, Joost Ouwerkerk <joost@openplaces.org>
>> wrote:
>> > I'm having trouble deleting rows in Cassandra.  After running a job that
>> > deletes hundreds of rows, I run another job that verifies that the rows
>> > are
>> > gone.  Both jobs run correctly.  However, when I run the verification
>> > job an
>> > hour later, the rows have re-appeared.  This is not a case of "ghosting"
>> > because the verification job actually checks that there is data in the
>> > columns.
>> >
>> > I am running a cluster with 12 nodes and a replication factor of 3.  I
>> > am
>> > using DC_QUORUM consistency when deleting.
>> >
>> > Any ideas?
>> > Joost.
>> >
>>
>>
>>
>> --
>> Jonathan Ellis
>> Project Chair, Apache Cassandra
>> co-founder of Riptano, the source for professional Cassandra support
>> http://riptano.com
>
>

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