http://dslab.epfl.ch/pubs/crashonly/crashonly.pdf
On Fri, May 21, 2010 at 7:15 AM, Peng Guo <gpcus...@gmail.com> wrote:
> I'm don't understand what is Cassandra's crash-only design.
>
> Could you explain that?
>
> Thanks.
>
> On Fri, May 21, 2010 at 8:35 PM, Gary Dusbabek <gdusba...@gmail.com> wrote:
>
>> Peng,
>>
>> I think you'll find that there are several threads in Cassandra that
>> have no mechanisms for exiting cleanly. This is part of Cassandra's
>> crash-only design.
>>
>> If you'd like to spend time figuring out how to shutdown Cassandra
>> cleanly, that would be great. It would simplify the way we write
>> tests and make Cassandra more embeddable. But we still want to keep
>> Cassandra crash-only.
>>
>> Gary.
>>
>>
>> On Fri, May 21, 2010 at 01:33, Peng Guo <gpcus...@gmail.com> wrote:
>> > Hi
>> >
>> > I find there still something need to do:
>> >
>> > Modity the Gossiper.java code like this:
>> >
>> > public void start(InetAddress localEndPoint, int generationNbr)
>> > {
>> > localEndPoint_ = localEndPoint;
>> > /* Get the seeds from the config and initialize them. */
>> > Set<InetAddress> seedHosts = DatabaseDescriptor.getSeeds();
>> > for (InetAddress seed : seedHosts)
>> > {
>> > if (seed.equals(localEndPoint))
>> > continue;
>> > seeds_.add(seed);
>> > }
>> >
>> > /* initialize the heartbeat state for this localEndPoint */
>> > EndPointState localState = endPointStateMap_.get(localEndPoint_);
>> > if ( localState == null )
>> > {
>> > HeartBeatState hbState = new HeartBeatState(generationNbr);
>> > localState = new EndPointState(hbState);
>> > localState.isAlive(true);
>> > localState.isAGossiper(true);
>> > endPointStateMap_.put(localEndPoint_, localState);
>> > }
>> >
>> > /* starts a timer thread */
>> > if (gossipTimer_ == null) {
>> > gossipTimer_ = new Timer(false); // makes the Gossiper
>> > reentrant.
>> > }
>> > gossipTimer_.schedule( new GossipTimerTask(),
>> > Gossiper.intervalInMillis_, Gossiper.intervalInMillis_);
>> > }
>> >
>> > and
>> >
>> > public void stop()
>> > {
>> > gossipTimer_.cancel();
>> > gossipTimer_ = null;
>> > }
>> >
>> > I don't know how to commit the patch, so I will learning it:)
>> >
>> >
>> > On Fri, May 21, 2010 at 11:50 AM, Jonathan Ellis <jbel...@gmail.com>
>> wrote:
>> >
>> >> Can you submit a patch to
>> https://issues.apache.org/jira/browse/CASSANDRA?
>> >>
>> >> Thanks!
>> >>
>> >> On Thu, May 20, 2010 at 7:39 PM, Peng Guo <gpcus...@gmail.com> wrote:
>> >> > Hi All
>> >> >
>> >> > This is my test code:
>> >> > public static void main(String[] args) throws IOException,
>> >> > InterruptedException {
>> >> > System.setProperty("storage-config",
>> >> > "D:\\apache-cassandra-0.6.1\\conf");
>> >> >
>> >> > StorageService.instance.initClient();
>> >> >
>> >> > StorageService.instance.stopClient();
>> >> > }
>> >> >
>> >> > I find when I run this code, the process can't stop.
>> >> >
>> >> > for I use the jstack look at this process, I find the
>> CONSISTENCY-MANAGER
>> >> > thread is still running.
>> >> >
>> >> > So I modify the code in StorageService.java like this:
>> >> >
>> >> > public void stopClient()
>> >> > {
>> >> > Gossiper.instance.unregister(this);
>> >> > Gossiper.instance.stop();
>> >> > MessagingService.shutdown();
>> >> > StageManager.shutdownNow();
>> >> >
>> >> > // this is added to stop the CONSISTENCY-MANAGER thread
>> >> > consistencyManager_.shutdownNow();
>> >> > }
>> >> >
>> >> > Can I commit this code in to svn branch?
>> >> >
>> >> > Thanks.
>> >> >
>> >> > --
>> >> > Regards
>> >> > Peng Guo
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> Jonathan Ellis
>> >> Project Chair, Apache Cassandra
>> >> co-founder of Riptano, the source for professional Cassandra support
>> >> http://riptano.com
>> >>
>> >
>> >
>> >
>> > --
>> > Regards
>> > Peng Guo
>> >
>>
>
>
>
> --
> Regards
> Peng Guo
>
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com
