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From "Edward J. Yoon" <edwardy...@apache.org>
Subject Re: About the table on time dimension.
Date Fri, 22 May 2009 07:27:20 GMT
OK, It's my typos, not my point. Result is same even if 'versions' is
1. Anyway, Do you think 'version mixed' table should be appeared?

hbase(main):025:0> describe 't1'
{NAME => 't1', IS_ROOT => 'false', IS_META => 'false', FAMILIES =>
[{NAME => 'f1', BLOOMFILTER => 'false', COM
PRESSION => 'NONE', VERSIONS => '1', LENGTH => '2147483647', TTL =>
'-1', IN_MEMORY => 'false', BLOCKCACHE =>
'false'}], INDEXES => []}
1 row(s) in 0.0230 seconds
hbase(main):028:0> scan 't1'
ROW                          COLUMN+CELL
 r1                          column=f1:, timestamp=1, value=value
 r2                          column=f1:, timestamp=3, value=value
2 row(s) in 0.0240 seconds

On Fri, May 22, 2009 at 3:41 PM, Ryan Rawson <ryanobjc@gmail.com> wrote:
> Hey,
>
> I generally don't think of hbase entries like spreadsheets with 'nulls' in
> the empty locations.  Its really more like an adjacency list, where the data
> is only there when it's there.
>
> But I was referring to your create, the key is 'VERSIONS' not 'VERSION'.
> create 'table', {NAME=>'family', VERSIONS=>1}
>
>
>
> On Thu, May 21, 2009 at 11:35 PM, Edward J. Yoon <edwardyoon@apache.org>wrote:
>
>> Let's assume, there are two 2 * 2 sparse tables as below.
>>
>> t1
>> ----
>> null 2
>> -1 null
>>
>> t2
>> ----
>> -3 null
>> null null
>>
>> I'll put these tables to table 'x'. And, The table 'x' will handle
>> only one version. Then, 't2' should be appeared, not 't1' + 't2'
>> table.
>>
>> Currently, Hbase shows the 't1' + 't2' table as below.
>> ----
>> -3(t2) 2(t1)
>> -1(t1) null (what is this?)
>>
>> Should I update the all 't1' entries?
>>
>> On Fri, May 22, 2009 at 3:11 PM, Ryan Rawson <ryanobjc@gmail.com> wrote:
>> > The key is 'VERSIONS'.  Give it another shot.
>> >
>> > -ryan
>> >
>> > On Thu, May 21, 2009 at 11:07 PM, Edward J. Yoon <edwardyoon@apache.org
>> >wrote:
>> >
>> >> hbase(main):001:0> create 't1', {NAME=> 'f1', VERSION => 1}
>> >> hbase(main):002:0> put 't1', 'r1', 'f1' ,'value', 1
>> >> hbase(main):007:0> put 't1', 'r2', 'f1:' ,'value', 2
>> >>
>> >> I made a table 't1' as above. And, When scan this,
>> >>
>> >> hbase(main):008:0> scan 't1'
>> >> ROW                          COLUMN+CELL
>> >>  r1                          column=f1:, timestamp=1, value=value
>> >>  r2                          column=f1:, timestamp=2, value=value
>> >> 2 row(s) in 0.0330 seconds
>> >>
>> >> I expected only one row 'r2' (sparse table for time t2) but there are
>> >> two tables on time dimension. I think it's a logical bug. The 't1'
>> >> should maintain only one version of time dimension table.
>> >>
>> >> What do you think?
>> >> --
>> >> Best Regards, Edward J. Yoon @ NHN, corp.
>> >> edwardyoon@apache.org
>> >> http://blog.udanax.org
>> >>
>> >
>>
>>
>>
>> --
>> Best Regards, Edward J. Yoon @ NHN, corp.
>> edwardyoon@apache.org
>> http://blog.udanax.org
>>
>



-- 
Best Regards, Edward J. Yoon @ NHN, corp.
edwardyoon@apache.org
http://blog.udanax.org

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