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.*
