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Posted to user@cassandra.apache.org by Jeff Zhang <zj...@gmail.com> on 2010/04/28 04:14:27 UTC
How to permanently delete one key ?
Hi all,
I use the thrift api to remove one key, and then use the
get_range_slices to get all the keys and find that the key which I
deleted is still there. I refer to the thrift api doc which says
get_range_slices will apply to all the keys including the deleted
keys. So my question is how can I delete one key permanently, my guess
is that cassandra won't delete the key at once just mark the deleted
keys. So when will cassandra do the real deletion operation?
--
Best Regards
Jeff Zhang
Re: How to permanently delete one key ?
Posted by Robert Coli <rc...@digg.com>.
On 4/28/10 2:47 AM, Schubert Zhang wrote:
> I think even through the real deletion is done when compaction.
> The get/get_range_slices should not return the deleted-marked keys (or
> columns).
http://wiki.apache.org/cassandra/FAQ#range_ghosts
=Rob
Re: How to permanently delete one key ?
Posted by Schubert Zhang <zs...@gmail.com>.
I think even through the real deletion is done when compaction.
The get/get_range_slices should not return the deleted-marked keys (or
columns).
Schubert
On Wed, Apr 28, 2010 at 1:39 PM, Jeff Zhang <zj...@gmail.com> wrote:
> Thanks Lu, it's helpful.
>
>
> On Wed, Apr 28, 2010 at 11:42 AM, Greg Lu <gr...@openplaces.org> wrote:
> > Hey Jeff,
> > I think this article addresses your
> > question:
> http://spyced.blogspot.com/2010/02/distributed-deletes-in-cassandra.html
> > -Greg
> >
> > On Tue, Apr 27, 2010 at 10:14 PM, Jeff Zhang <zj...@gmail.com> wrote:
> >>
> >> Hi all,
> >>
> >> I use the thrift api to remove one key, and then use the
> >> get_range_slices to get all the keys and find that the key which I
> >> deleted is still there. I refer to the thrift api doc which says
> >> get_range_slices will apply to all the keys including the deleted
> >> keys. So my question is how can I delete one key permanently, my guess
> >> is that cassandra won't delete the key at once just mark the deleted
> >> keys. So when will cassandra do the real deletion operation?
> >>
> >>
> >> --
> >> Best Regards
> >>
> >> Jeff Zhang
> >
> >
>
>
>
> --
> Best Regards
>
> Jeff Zhang
>
Re: How to permanently delete one key ?
Posted by Jeff Zhang <zj...@gmail.com>.
Thanks Lu, it's helpful.
On Wed, Apr 28, 2010 at 11:42 AM, Greg Lu <gr...@openplaces.org> wrote:
> Hey Jeff,
> I think this article addresses your
> question: http://spyced.blogspot.com/2010/02/distributed-deletes-in-cassandra.html
> -Greg
>
> On Tue, Apr 27, 2010 at 10:14 PM, Jeff Zhang <zj...@gmail.com> wrote:
>>
>> Hi all,
>>
>> I use the thrift api to remove one key, and then use the
>> get_range_slices to get all the keys and find that the key which I
>> deleted is still there. I refer to the thrift api doc which says
>> get_range_slices will apply to all the keys including the deleted
>> keys. So my question is how can I delete one key permanently, my guess
>> is that cassandra won't delete the key at once just mark the deleted
>> keys. So when will cassandra do the real deletion operation?
>>
>>
>> --
>> Best Regards
>>
>> Jeff Zhang
>
>
--
Best Regards
Jeff Zhang
Re: How to permanently delete one key ?
Posted by Greg Lu <gr...@openplaces.org>.
Hey Jeff,
I think this article addresses your question:
http://spyced.blogspot.com/2010/02/distributed-deletes-in-cassandra.html
-Greg
On Tue, Apr 27, 2010 at 10:14 PM, Jeff Zhang <zj...@gmail.com> wrote:
> Hi all,
>
> I use the thrift api to remove one key, and then use the
> get_range_slices to get all the keys and find that the key which I
> deleted is still there. I refer to the thrift api doc which says
> get_range_slices will apply to all the keys including the deleted
> keys. So my question is how can I delete one key permanently, my guess
> is that cassandra won't delete the key at once just mark the deleted
> keys. So when will cassandra do the real deletion operation?
>
>
> --
> Best Regards
>
> Jeff Zhang
>