Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
HBase >> mail # user >> Set Max Number of Row Versions of a table


Copy link to this message
-
Re: Set Max Number of Row Versions of a table
Works pretty well. Thanks for the examples.
On Mon, Sep 9, 2013 at 2:04 AM, Nicolas Liochon <[EMAIL PROTECTED]> wrote:

> Here is an example on trunk. IIRC, with 0.94, you may have to disable the
> table before updating the definition.
>
> hbase(main):007:0> create 't2', {NAME => 'f1', VERSIONS => 5}
> 0 row(s) in 0.2820 seconds
>
> => Hbase::Table - t2
>
>
> hbase(main):008:0> describe 't2'
> DESCRIPTION
> ENABLED
>  't2', {NAME => 'f1', DATA_BLOCK_ENCODING => 'NONE', BLOOMFILTER => 'ROW',
> REPLICATION_SCOPE => '0', VERSIONS => '5'
> true
>  , COMPRESSION => 'NONE', MIN_VERSIONS => '0', TTL => '2147483647',
> KEEP_DELETED_CELLS => 'false', BLOCKSIZE =>
> '655
>  36', IN_MEMORY => 'false', ENCODE_ON_DISK => 'true', BLOCKCACHE =>
> 'true'}
>
> 1 row(s) in 0.0050 seconds
>
>
>
> hbase(main):011:0> alter 't2', { NAME => 'f1', VERSIONS => 2 }
> Updating all regions with the new schema...
> 0/1 regions updated.
> 1/1 regions updated.
> Done.
> 0 row(s) in 2.2480 seconds
>
>
> hbase(main):012:0> describe 't2'
> DESCRIPTION
> ENABLED
>  't2', {NAME => 'f1', DATA_BLOCK_ENCODING => 'NONE', BLOOMFILTER => 'ROW',
> REPLICATION_SCOPE => '0', VERSIONS => '2'
> true
>  , COMPRESSION => 'NONE', MIN_VERSIONS => '0', TTL => '2147483647',
> KEEP_DELETED_CELLS => 'false', BLOCKSIZE =>
> '655
>  36', IN_MEMORY => 'false', ENCODE_ON_DISK => 'true', BLOCKCACHE =>
> 'true'}
>
> 1 row(s) in 0.0040 seconds
>
>
>
> On Mon, Sep 9, 2013 at 10:51 AM, Gaetan Deputier <[EMAIL PROTECTED]
> >wrote:
>
> > I tried on a simple table using the following commands :
> >
> > create 't', 'f'
> >
> > alter 't', NAME => 'f', VERSIONS => 5
> >
> > I have this Error : ERROR: Column family datafVERSIONS5 must have a name
> >
> > I have tried with the syntax from the alter help page but no success. Any
> > hints ?
> >
> >
> > I am running Hbase from Cloudera version 0.94.6-cdh4.3.0.
> >
> >
> > On Mon, Sep 9, 2013 at 1:25 AM, Gaetan Deputier <[EMAIL PROTECTED]
> > >wrote:
> >
> > > Exactly what i was looking for. Thank you very much !
> > >
> > >
> > > On Mon, Sep 9, 2013 at 12:48 AM, Nicolas Liochon <[EMAIL PROTECTED]
> > >wrote:
> > >
> > >> There is a comment in this class that is outdated ("Once set, the
> > >> parameters that specify a column cannot be changed without deleting
> the
> > >> column and recreating it. If there is data stored in the column, it
> will
> > >> be
> > >> deleted when the column is deleted."). This is from 2007. I will fix
> > this.
> > >>
> > >> It's possible to alter a table after its definition, and you will not
> > lose
> > >> any data. See the alter command in the shell: alter 't1', NAME ='f1',
> > >> VERSIONS => 5
> > >>
> > >>
> > >> On Mon, Sep 9, 2013 at 6:32 AM, Ted Yu <[EMAIL PROTECTED]> wrote:
> > >>
> > >> > Take a look at HColumnDescriptor#setMaxVersions()
> > >> >
> > >> > Cheers
> > >> >
> > >> > On Sun, Sep 8, 2013 at 9:13 PM, Gaetan Deputier <
> > >> [EMAIL PROTECTED]
> > >> > >wrote:
> > >> >
> > >> > > Hello Hbase users,
> > >> > >
> > >> > > Is it possible to set the max number of row versions of a table
> > after
> > >> its
> > >> > > creation ?
> > >> > >
> > >> > > Sincerely
> > >> > >
> > >> > > G.
> > >> > >
> > >> >
> > >>
> > >
> > >
> >
>