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From "Kevin O'dell" <kevin.od...@cloudera.com>
Subject Re: Possible to delete a specific cell?
Date Thu, 07 Mar 2013 18:37:49 GMT
I have filed https://issues.apache.org/jira/browse/HBASE-8029

On Thu, Mar 7, 2013 at 1:31 PM, Jeff Kolesky <jeff@opower.com> wrote:

> Yes, this behavior would be fantastic.  If you follow the Kiji/Wibi model
> of using many versioned cells, being able to delete a specific cell without
> deleting all cells prior to it would be very useful.
>
> Jeff
>
>
> On Thu, Mar 7, 2013 at 10:26 AM, Kevin O'dell <kevin.odell@cloudera.com
> >wrote:
>
> > The problem is it kills all older cells.  We should probably file a JIRA
> > for this, as this behavior would be nice.  Thoughts?:
> >
> > hbase(main):028:0> truncate 'tre'
> >
> > Truncating 'tre' table (it may take a while):
> >
> > - Disabling table...
> >
> > - Dropping table...
> >
> > - Creating table...
> >
> > 0 row(s) in 4.6060 seconds
> >
> >
> > hbase(main):029:0> put 'tre', 'row1', 'cf1:c1', 'abc', 111
> >
> > 0 row(s) in 0.0220 seconds
> >
> >
> > hbase(main):030:0> put 'tre', 'row1', 'cf1:c1', 'abcd', 112
> >
> > 0 row(s) in 0.0060 seconds
> >
> >
> > hbase(main):031:0> put 'tre', 'row1', 'cf1:c1', 'abce', 113
> >
> > 0 row(s) in 0.0120 seconds
> >
> >
> > hbase(main):032:0> scan 'tre', {NAME => 'cf1:c1', VERSIONS => 4}
> >
> > ROW                                                          COLUMN+CELL
> >
> >
> >
> >
> > row1
>  column=cf1:c1,
> > timestamp=113, value=abce
> >
> >
> >
> > row1
>  column=cf1:c1,
> > timestamp=112, value=abcd
> >
> >
> >
> > row1
>  column=cf1:c1,
> > timestamp=111, value=abc
> >
> >
> > hbase(main):033:0> delete 'tre', 'row1', 'cf1:c1', 112
> >
> > 0 row(s) in 0.0110 seconds
> >
> >
> > hbase(main):034:0> scan 'tre', {NAME => 'cf1:c1', VERSIONS => 4}
> >
> > ROW                                                          COLUMN+CELL
> >
> >
> >
> >
> >  row1
>  column=cf1:c1,
> > timestamp=113, value=abce
> >
> >
> >
> > 1 row(s) in 0.0290 seconds
> >
> >
> > On Thu, Mar 7, 2013 at 1:22 PM, Sergey Shelukhin <sergey@hortonworks.com
> > >wrote:
> >
> > > Shouldn't you be able to insert delete with t belonging to (t2, t3) to
> > > achieve this effect?
> > >
> > > On Thu, Mar 7, 2013 at 10:12 AM, Jonathan Natkins <natty@wibidata.com
> > > >wrote:
> > >
> > > > Yep, that's the scenario I was curious about. Thanks!
> > > >
> > > >
> > > > On Thu, Mar 7, 2013 at 10:04 AM, Jean-Marc Spaggiari <
> > > > jean-marc@spaggiari.org> wrote:
> > > >
> > > > > Hi Jonathan,
> > > > >
> > > > > Is that what you mean?
> > > > >
> > > > > In the same CF:C
> > > > > insert r1 v1 t1
> > > > > insert r1 v2 t2
> > > > > insert r1 v3 t3
> > > > >
> > > > > Then you want to be able to delete r1 v3 t3 to see r1 v2?
> > > > >
> > > > > This is not possible. If you put a delete with t4, everything older
> > > > > than t4 will be deleted when the compression will occur.
> > > > >
> > > > > JM
> > > > >
> > > > > 2013/3/7 Jonathan Natkins <natty@wibidata.com>:
> > > > > > It was suggested to me that there might be a way to delete a
cell
> > in
> > > a
> > > > > > column for a particular timestamp, without masking all older
> > values.
> > > Is
> > > > > > this true? Or have I been fed lies?
> > > > > >
> > > > > > Thanks!
> > > > > > Natty
> > > > > >
> > > > > > --
> > > > > > http://www.wibidata.com
> > > > > > office: 1.415.496.9424 x208
> > > > > > cell: 1.609.577.1600
> > > > > > twitter: @nattyice <http://www.twitter.com/nattyice>
> > > > >
> > > >
> > > >
> > > >
> > > > --
> > > > http://www.wibidata.com
> > > > office: 1.415.496.9424 x208
> > > > cell: 1.609.577.1600
> > > > twitter: @nattyice <http://www.twitter.com/nattyice>
> > > >
> > >
> >
> >
> >
> > --
> > Kevin O'Dell
> > Customer Operations Engineer, Cloudera
> >
>
>
>
> --
> *Jeff Kolesky*
> Chief Software Architect
> *Opower*
>



-- 
Kevin O'Dell
Customer Operations Engineer, Cloudera

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