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From Ryan Rawson <ryano...@gmail.com>
Subject Re: Iterating over all cells in HBase
Date Fri, 27 Mar 2009 20:40:26 GMT
The RowResult class contains what you are looking for...

you want 'entrySet()' which contains byte[] -> Cell, where byte[] = column
name, Cell = value & timestamp of the data.

Good luck!
-ryan

On Fri, Mar 27, 2009 at 1:28 PM, Vaibhav Puranik <vpuranik@gmail.com> wrote:

> Hi all,
>
> One more newbie question.
>
> Is there any way to iterate over all the cells (values of all column
> families:all columns) of a given table without knowing what columns there
> are?
> (I am still struggling with whether a column is data or metadata)
>
> I looked into apis for HTable, HTableDescriptor, HColumnDescriptor but
> couldn't find anything to get columns.
>
> tables.each {tableDescriptor ->
>    families = tableDescriptor.getFamilies()
>    families.each {family ->
>        print family.getNameAsString()
>    }
> }
>
> Can anyone suggest a method in HColumnDescriptor that can give me all the
> column names?
>
> Is it unusual to iterate over all column, all rows in a given HBase table?
> We were thinking of doing that to populate memcached.
>
> Regards,
> Vaibhav
>

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