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From Nipuni Piyabasi Perera <nipuni880...@gmail.com>
Subject Re: Secondary Index Storage
Date Fri, 23 Aug 2013 10:34:51 GMT
Hi,

Ok, so if I want to make it separate and test, where should I refer? From
where the keyspace refer to the location "/var/lib/cassandra/data". I have
debug the code, and could see some variables (e.g jdk location etc) can be
accessed from :

System.getProperty("");

But this does not contain the disk location to keyspace.

Thanks,
Nipuni


On Fri, Aug 23, 2013 at 9:52 AM, Jonathan Ellis <jbellis@gmail.com> wrote:

> Sorry, Aleksey pointed out that the index directory isn't separate from the
> "parent" table.  Probably so that we can snapshot them both together, which
> is why the separate config in .yaml doesn't make sense either.
>
>
> On Thu, Aug 22, 2013 at 11:07 PM, Jonathan Ellis <jbellis@gmail.com>
> wrote:
>
> > You can already symlink the index directory anywhere you like.  I'm not
> > convinced that special-casing indexes is a good approach in general vs
> > looking at performance of all tables.
> >
> >
> > On Thu, Aug 22, 2013 at 8:16 PM, Nipuni Piyabasi Perera <
> > nipuni880917@gmail.com> wrote:
> >
> >> Hi,
> >>
> >> I need to do a secondary index access improvement with a little
> >> modification to Cassandra. I could see in [1], that the performance of
> >> secondary index querying can be increased via splitting the column
> family
> >> data and secondary index data.
> >> Currently Cassandra saves keyspace data and secondary indices data in
> >> "var/lib/cassandra/data/".
> >> According to my understanding the data saves in the
> >> "data_file_directories"
> >> location of conf/cassandra.yaml file. If I can enter new variable into
> >> "cassandra.yaml" file and address it in the place where Cassandra stores
> >> secondary indexes, this can be fixed.
> >>
> >> Can anyone give some guidance regarding this improvement.
> >>
> >> [1] https://issues.apache.org/jira/browse/CASSANDRA-5502
> >>
> >> Thanks,
> >> Nipuni
> >>
> >> --
> >> Nipuni Piyabasi Perera
> >> Undergraduate
> >> Department of Computer Science And Engineering
> >> University of Moratuwa
> >> Sri Lanka
> >>
> >
> >
> >
> > --
> > Jonathan Ellis
> > Project Chair, Apache Cassandra
> > co-founder, http://www.datastax.com
> > @spyced
> >
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder, http://www.datastax.com
> @spyced
>



-- 
Nipuni Piyabasi Perera
Undergraduate
Department of Computer Science And Engineering
University of Moratuwa
Sri Lanka

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