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Accumulo >> mail # dev >> Column Scan / table metadata


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Re: Column Scan / table metadata
On Wed, Sep 18, 2013 at 3:15 PM, Keith Turner <[EMAIL PROTECTED]> wrote:

> On Wed, Sep 18, 2013 at 2:42 PM, Devin Pinkston <[EMAIL PROTECTED]
> >wrote:
>
> > I have been looking through the Accumulo source to try and find the best
> > way to derive the column structure/metadata of a table.  If I have a
> table
> >
>
> Metadata in RFile contains some info about column families, but not column
> qualifiers.   For the default locality group rfile keeps track of up to
> 1000 column families.  If you run "accumulo rfile-info" you can see this
> info.
>

Isn't that metadata only updated on compaction, Keith?
>
>
> > "sample", and I want to find all the column families/qualifiers, is
> there a
> > built-in facility in Accumulo to get a list of columns in that table?  Or
> > would my best option be to scan() the entire table, and only put unique
> > column families/qualifiers into a list and return to the user?
> >
> > I am imagining the user has no idea of what their columns are like in
> this
> > table, that is why I ask.
> >
> > Thanks!
> >
>
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB