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From Christian Posta <christian.po...@gmail.com>
Subject Re: How to ensure LevelDB store uses a JNI driver
Date Wed, 06 Mar 2013 15:36:20 GMT
Apollo does this. I think the logs are coming from the leveldb store, so
when using with ActiveMQ 5.x it should be the same (but i didn't try yet).
It will only log if NOT using the JNI impl.


On Wed, Mar 6, 2013 at 12:35 AM, Claus Ibsen <claus.ibsen@gmail.com> wrote:

> On Wed, Mar 6, 2013 at 8:00 AM, SuoNayi <suonayi2006@163.com> wrote:
> > Also I saw the leveldb-0.2.jar in the extra directory under the lib
> directory, seems it's the java LevelDB implement.
> >
> > I removed the jar from the extra directory and deployed a new broker on
> other new CentOS server and restarted the broker,
> > but I could still send messages to the new broker and log files created
> by LevelDB were present in the specific directory.
> >
>
> I think the leveldb driver/transport has a Java based driver that it
> fallback and use if the JNI is not possible/present.
>
> Though Hiram would be the best person to answer that.
>
> And yeah if there is something we can make more obvious from INFO
> logging when starting the broker which one is in use, that would be
> great.
>
>
> > So here I'm more confused about that the broker with removal the
> leveldb-0.2.jar is deployed on the new CentOS server without
> > LevelDB installation can still work.
> > The version is activemq-5.7.0.fuse-71-047.
> >
> > At 2013-03-06 13:36:46,SuoNayi <suonayi2006@163.com> wrote:
> >>Hi ,
> >>Can we ensure LevelDB store uses a JNI driver or not via logging?
> >>I have deployed brokers on two CentOS servers, one server with LevelDB
> installation while the other without installation.
> >>After changing the logging level to DEBUG, I still can not find logs to
> indicate that a JNI driver or a pure java implement is used.
> >>On the same server my broker was deployed without LevelDB installation
> at first, I use a simple load producer to send massive
> >>messages to measure performance,after that I installed LevelDB and
> restarted the broker and the load producer.
> >>What make me confused is that the performance measure is very close. So
> I suspect if the JNI driver is used or not.
> >>If not used the java LevelDB will be used?Can I assume the JNI driver
> always performs better than the java driver?
> >>
> >>
> >>Thanks,
> >>SuoNayi
> >>
> >>
> >>
> >>
> >>
> >>--
> >>
> >>Wangyin
> >>SuoNayi2006@163.com
> >>
>
>
>
> --
> Claus Ibsen
> -----------------
> Red Hat, Inc.
> FuseSource is now part of Red Hat
> Email: cibsen@redhat.com
> Web: http://fusesource.com
> Twitter: davsclaus
> Blog: http://davsclaus.com
> Author of Camel in Action: http://www.manning.com/ibsen
>



-- 
*Christian Posta*
http://www.christianposta.com/blog
twitter: @christianposta

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