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HBase >> mail # user >> Possible to delete a specific cell?


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Re: Possible to delete a specific cell?
Ted,

 Yes that is correct, sorry 3 is newer than 1 when speak TSs.  Sorry for
the confusion :)

On Thu, Mar 7, 2013 at 1:48 PM, Ted Yu <[EMAIL PROTECTED]> wrote:

> I think there was typo in Kevin's email: t3 should be t1
>
> On Thu, Mar 7, 2013 at 10:42 AM, Kevin O'dell <[EMAIL PROTECTED]
> >wrote:
>
> > JM,
> >
> >   If you delete t2, you will also wipe out t3 right now.
> >
> > On Thu, Mar 7, 2013 at 1:37 PM, Jean-Marc Spaggiari <
> > [EMAIL PROTECTED]
> > > wrote:
> >
> > > Kevin,
> > >
> > > How do you see that? Like a specific cell format which can "cancel"
> > > once timestamp and no delete all the previous one?
> > >
> > > Like before compaction we can have
> > >
> > > v1:t1
> > > v1:t2
> > > v1:t3
> > > v1:d2 <= Delete only t2 version.
> > >
> > > And at compaction time we only keep that in mind and give this as a
> > result:
> > > v1:t1
> > > v1:t3
> > >
> > > ?
> > >
> > > 2013/3/7 Jeff Kolesky <[EMAIL PROTECTED]>:
> > > > 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 <
> > [EMAIL PROTECTED]
> > > >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 <
> > > [EMAIL PROTECTED]
> > > >> >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 <
> > [EMAIL PROTECTED]
> > > >> > >wrote:
> > > >> >
> > > >> > > Yep, that's the scenario I was curious about. Thanks!
> > > >> > >
> > > >> > >
> > > >> > > On Thu, Mar 7, 2013 at 10:04 AM, Jean-Marc Spaggiari <
> > > >> > > [EMAIL PROTECTED]> 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

Kevin O'Dell
Customer Operations Engineer, Cloudera
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB