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From Doug Meil <doug.m...@explorysmedical.com>
Subject Re: a strange situation of HBase when I issue scan '.META.' command
Date Mon, 05 Mar 2012 13:14:09 GMT

Hi there-

You might want to see this in the Ref Guide.

http://hbase.apache.org/book.html#arch.catalog

"A region with an empty start key
       is the first region in a table.  If region has both an empty start
and an empty end key, its the only region in the table"




On 3/5/12 7:27 AM, "yonghu" <yongyong313@gmail.com> wrote:

>Hello,
>
>My HBase version is 0.90.2 and installed in pseudo mode. I have
>successfully inserted two tuples in the 'test' table.
>hbase(main):005:0> scan 'test'
>ROW                        COLUMN+CELL
> jim                       column=course:english,
>timestamp=1330949116240, value=1.3
> tom                       column=course:english,
>timestamp=1330949141314, value=1.5
>2 row(s) in 0.0440 seconds
>
>But when I issued scan 'META.' command, the output is as follows
>hbase(main):004:0> scan '.META.'
>ROW                        COLUMN+CELL
> test,,1330949037296.78209 column=info:regioninfo,
>timestamp=1330949037572, value=REGION => {NAME =>
> 59e66aaca7a4a1e736937cdba
>'test,,1330949037296.7820959e66aaca7a4a1e736937cdba89.', STARTKEY =>
>'',
> 89.                        ENDKEY => '', ENCODED =>
>7820959e66aaca7a4a1e736937cdba89, TABLE => {{NA
>                           ME => 'test', FAMILIES => [{NAME =>
>'course', BLOOMFILTER => 'NONE', REPL
>                           ICATION_SCOPE => '0', COMPRESSION =>
>'NONE', VERSIONS => '3', TTL => '214
>                           7483647', BLOCKSIZE => '65536', IN_MEMORY
>=> 'false', BLOCKCACHE => 'true
>                           '}]}}
> test,,1330949037296.78209 column=info:server,
>timestamp=1330949037730, value=huyong-laptop:60020
> 59e66aaca7a4a1e736937cdba
> 89.
> test,,1330949037296.78209 column=info:serverstartcode,
>timestamp=1330949037730, value=1330944724819
> 59e66aaca7a4a1e736937cdba
> 89.
>1 row(s) in 0.0310 seconds
>
>My question is that why the startkey and endkey fields are empty? As
>you see, the test table has two tuples.
>
>Thanks.
>
>Yong
>



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