Oh I was thinking of StorageProxy. StorageService should exist you just have the path wrong. It should be "org.apache.cassandra.db:type=StorageService".(you had org.apache.cassandra.service) JMX should be lightweight enough for this.
On Wed, Nov 23, 2011 at 9:06 AM, David McNelis <dmcne...@agentisenergy.com> wrote: > But if the StorageService bean is only created once a transaction has > occurred, is there another location, i.e. the CommitLog, that I could check > just to see if the node is 'live'. Or do you think I'd be better served > trying to execute something on the node (i.e. read a record using Hector)? > Ideally this would be as low cost an operation on the Cassandra node as > possible, since it is just monitoring statuses (stati?). > > On Tue, Nov 22, 2011 at 1:15 PM, Nick Bailey <n...@datastax.com> wrote: >> >> There are quite a few attributes in the >> org.apace.cassandra.db.StorageServiceMBean that could serve that >> purpose. >> >> Initialized, RPCServerRunning, OperationMode, Joined, and perhaps others >> >> Note that some of those may not exist depending on your version of >> cassandra, pick one appropriate for your version. >> >> On Tue, Nov 22, 2011 at 1:02 PM, David McNelis >> <dmcne...@agentisenergy.com> wrote: >> > Would there be a better bean to look at to ascertain the status that >> > would >> > be created when the server starts up? >> > >> > On Tue, Nov 22, 2011 at 11:47 AM, Nick Bailey <n...@datastax.com> wrote: >> >> >> >> The StorageServiceMBean is only created once some reads/writes >> >> actually go to that node. Do a couple reads/writes from the CLI and >> >> you should see the MBean afterwards. >> >> >> >> This also means your monitoring application should handle this error >> >> in the case of nodes restarting. >> >> >> >> On Tue, Nov 22, 2011 at 7:51 AM, David McNelis >> >> <dmcne...@agentisenergy.com> wrote: >> >> > Good morning, >> >> > I'm trying to set up a simple monitoring application (that is a >> >> > plugin >> >> > to >> >> > Nagios), code can be found >> >> > >> >> > >> >> > here: https://github.com/so-net-developer/Cassandra/blob/master/nagios/CheckNode.java >> >> > However, when I try to run the CheckNode.java program I get an error >> >> > that: >> >> > Exception in thread "main" >> >> > javax.management.InstanceNotFoundException: >> >> > org.apache.cassandra.service:type=StorageService >> >> > According to the docs on Cassandra and JMX this should be a valid >> >> > Instance >> >> > to create. I've tried running this from both on the cassandra node >> >> > and >> >> > remotely, with no difference in outcome. >> >> > I don't know if it matters, but these are the domains listed as >> >> > available >> >> > when I make a JMX getDomains call: >> >> > org.apache.cassandra.internal >> >> > JMImplementation >> >> > com.sun.management >> >> > org.apache.cassandra.request >> >> > org.apache.cassandra.net >> >> > java.lang >> >> > java.util.logging >> >> > org.apache.cassandra.db >> >> > Because I get a response when iterating over >> >> > MBeanServerConection.getDomains(): >> >> > JMXConnector connector = JMXConnectorFactory.connect(new >> >> > JMXServiceURL(JMXURL)); >> >> > MBeanServerConnection connection = >> >> > connector.getMBeanServerConnection(); >> >> > for(String d : connection.getDomains()) >> >> > System.out.println(d); >> >> > I am disinclined to think its an issue with not being able to connect >> >> > to >> >> > JMX >> >> > in general. >> >> > -- >> >> > David McNelis >> >> > Lead Software Engineer >> >> > Agentis Energy >> >> > www.agentisenergy.com >> >> > c: 219.384.5143 >> >> > A Smart Grid technology company focused on helping consumers of >> >> > energy >> >> > control an often under-managed resource. >> >> > >> >> > >> > >> > >> > >> > -- >> > David McNelis >> > Lead Software Engineer >> > Agentis Energy >> > www.agentisenergy.com >> > c: 219.384.5143 >> > A Smart Grid technology company focused on helping consumers of energy >> > control an often under-managed resource. >> > >> > > > > > -- > David McNelis > Lead Software Engineer > Agentis Energy > www.agentisenergy.com > c: 219.384.5143 > A Smart Grid technology company focused on helping consumers of energy > control an often under-managed resource. > >
