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From fding hbase <fding.hb...@gmail.com>
Subject Re: EndPoint Coprocessor could be dealocked?
Date Fri, 18 May 2012 00:38:59 GMT
Hi Michel,
On Fri, May 18, 2012 at 1:39 AM, Michael Segel <michael_segel@hotmail.com>wrote:

> > You should not let just any user run coprocessors on the server. That's
> madness.
> >
> > Best regards,
> >
> >    - Andy
> Fei Ding,
> I'm a little confused.
> Are you trying to solve the problem of querying  data efficiently from a
> table, or are you trying to find an example of where and when  to use
> co-processors?
I'm trying to solve the problem of querying data efficiently. Coprocessor
is one of the possible solutions that I've tried.

> You actually have an interesting problem that isn't easily solved in
> relational databases, but I don't think its an appropriate problem if you
> want to stress the use of coprocessors.
> Yes with Indexes you want to use coprocessors as a way to keep the index
> in synch with the underlying table.
> However beyond that... the solution is really best run as a M/R job.
> Considering that HBase has two different access methods. One is as part of
> M/R jobs, the other is a client/server model.  If you wanted to, you could
> create a service/engine/app that would allow you to efficiently query and
> return result sets from your database, as well as manage indexes.
> In part, coprocessors make this a lot easier.

I'm not using the coprocessors to maintain index tables, but using extended
client to do this.

> If you consider the general flow of my solution earlier in this thread,
> you now have a really great way to implement this.
> Note: we're really talking about allowing someone to query data from a
> table using multiple indexes and index types. Think alternate table
> (key/value pair) , Lucene/SOLR, and GeoSpatial.
> You could even bench mark it against an Oracle implementation, and
> probably smoke it.
> You could also do efficient joins between tables.
> So yeah, I would encourage you to work on your initial problem... ;-)
Alternate table is also one of the possible solutions, however, it's not
that easy too.  I'm still working on it. ;-)


Best Regards!

Fei Ding

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