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HBase, mail # user - Possible to delete a specific cell?


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Jonathan Natkins 2013-03-07, 17:55
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Ted Yu 2013-03-07, 18:04
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Jean-Marc Spaggiari 2013-03-07, 18:04
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Jonathan Natkins 2013-03-07, 18:12
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Sergey Shelukhin 2013-03-07, 18:22
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Kevin Odell 2013-03-07, 18:26
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Jeff Kolesky 2013-03-07, 18:31
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Kevin Odell 2013-03-07, 18:37
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Re: Possible to delete a specific cell?
Jean-Marc Spaggiari 2013-03-07, 18:37
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 older
>> > > > than t4 will be deleted when the compression will occur.
>> > > >
>> > > > JM
>> > > >
>> > > > 2013/3/7 Jonathan Natkins <[EMAIL PROTECTED]>:
>> > > > > 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*
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Kevin Odell 2013-03-07, 18:42
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Ted Yu 2013-03-07, 18:48
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Kevin Odell 2013-03-07, 18:49
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Jonathan Natkins 2013-03-07, 20:25
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yonghu 2013-03-07, 20:56
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ramkrishna vasudevan 2013-03-08, 03:20
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Jean-Marc Spaggiari 2013-03-07, 18:44
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Kevin Odell 2013-03-07, 18:48
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Sergey Shelukhin 2013-03-07, 18:39