Re: Is there a way from a running Cassandra node to determine whether or not itself is up?
take a look at mx4j http://wiki.apache.org/cassandra/Operations#Monitoring_with_MX4J someone told me once you can call the JMX ops via http, i've not checked though. Cheers - Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 16 Jun 2011, at 14:45, Jake Luciani wrote: No force a node down you can use nodetool disablegossip On Wed, Jun 15, 2011 at 6:42 PM, Suan Aik Yeo yeosuan...@gmail.com wrote: Thanks, Aaron, but we determined that adding Java into the equation just brings in too much complexity for something that's called out of an Nginx Perl module. Right now I'm having trouble even replicating the above scenario and posted a question here: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Easy-way-to-overload-a-single-node-on-purpose-tt6480958.html - Suan On Thu, Jun 9, 2011 at 3:58 AM, aaron morton aa...@thelastpickle.com wrote: None via thrift that I can recall, but the StorageService MBean exposes getLiveNodes() this is what nodetool uses to see which nodes are live. From the code... /** * Retrieve the list of live nodes in the cluster, where liveness is * determined by the failure detector of the node being queried. * * @return set of IP addresses, as Strings */ public ListString getLiveNodes(); Hope that helps. - Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 9 Jun 2011, at 17:56, Suan Aik Yeo wrote: Is there a way (preferably an exposed method accessible through Thrift), from a running Cassandra node to determine whether or not itself is up? (Per Cassandra standards, I'm assuming based on the gossip protocol). Another way to think of what I'm looking for is basically running nodetool ring just on myself, but I'm only interested in knowing whether I'm Up or Down? I'm currently using the describe_cluster method, but earlier today when the commitlogs for a node filled up and it appeared down to the other nodes, describe_cluster() still worked fine, thus failing the check. Thanks, Suan -- http://twitter.com/tjake
Re: Is there a way from a running Cassandra node to determine whether or not itself is up?
Thanks, Aaron, but we determined that adding Java into the equation just brings in too much complexity for something that's called out of an Nginx Perl module. Right now I'm having trouble even replicating the above scenario and posted a question here: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Easy-way-to-overload-a-single-node-on-purpose-tt6480958.html - Suan On Thu, Jun 9, 2011 at 3:58 AM, aaron morton aa...@thelastpickle.comwrote: None via thrift that I can recall, but the StorageService MBean exposes getLiveNodes() this is what nodetool uses to see which nodes are live. From the code... /** * Retrieve the list of live nodes in the cluster, where liveness is * determined by the failure detector of the node being queried. * * @return set of IP addresses, as Strings */ public ListString getLiveNodes(); Hope that helps. - Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 9 Jun 2011, at 17:56, Suan Aik Yeo wrote: Is there a way (preferably an exposed method accessible through Thrift), from a running Cassandra node to determine whether or not itself is up? (Per Cassandra standards, I'm assuming based on the gossip protocol). Another way to think of what I'm looking for is basically running nodetool ring just on myself, but I'm only interested in knowing whether I'm Up or Down? I'm currently using the describe_cluster method, but earlier today when the commitlogs for a node filled up and it appeared down to the other nodes, describe_cluster() still worked fine, thus failing the check. Thanks, Suan
Re: Is there a way from a running Cassandra node to determine whether or not itself is up?
No force a node down you can use nodetool disablegossip On Wed, Jun 15, 2011 at 6:42 PM, Suan Aik Yeo yeosuan...@gmail.com wrote: Thanks, Aaron, but we determined that adding Java into the equation just brings in too much complexity for something that's called out of an Nginx Perl module. Right now I'm having trouble even replicating the above scenario and posted a question here: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Easy-way-to-overload-a-single-node-on-purpose-tt6480958.html - Suan On Thu, Jun 9, 2011 at 3:58 AM, aaron morton aa...@thelastpickle.comwrote: None via thrift that I can recall, but the StorageService MBean exposes getLiveNodes() this is what nodetool uses to see which nodes are live. From the code... /** * Retrieve the list of live nodes in the cluster, where liveness is * determined by the failure detector of the node being queried. * * @return set of IP addresses, as Strings */ public ListString getLiveNodes(); Hope that helps. - Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 9 Jun 2011, at 17:56, Suan Aik Yeo wrote: Is there a way (preferably an exposed method accessible through Thrift), from a running Cassandra node to determine whether or not itself is up? (Per Cassandra standards, I'm assuming based on the gossip protocol). Another way to think of what I'm looking for is basically running nodetool ring just on myself, but I'm only interested in knowing whether I'm Up or Down? I'm currently using the describe_cluster method, but earlier today when the commitlogs for a node filled up and it appeared down to the other nodes, describe_cluster() still worked fine, thus failing the check. Thanks, Suan -- http://twitter.com/tjake
Re: Is there a way from a running Cassandra node to determine whether or not itself is up?
None via thrift that I can recall, but the StorageService MBean exposes getLiveNodes() this is what nodetool uses to see which nodes are live. From the code... /** * Retrieve the list of live nodes in the cluster, where liveness is * determined by the failure detector of the node being queried. * * @return set of IP addresses, as Strings */ public ListString getLiveNodes(); Hope that helps. - Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 9 Jun 2011, at 17:56, Suan Aik Yeo wrote: Is there a way (preferably an exposed method accessible through Thrift), from a running Cassandra node to determine whether or not itself is up? (Per Cassandra standards, I'm assuming based on the gossip protocol). Another way to think of what I'm looking for is basically running nodetool ring just on myself, but I'm only interested in knowing whether I'm Up or Down? I'm currently using the describe_cluster method, but earlier today when the commitlogs for a node filled up and it appeared down to the other nodes, describe_cluster() still worked fine, thus failing the check. Thanks, Suan
Is there a way from a running Cassandra node to determine whether or not itself is up?
Is there a way (preferably an exposed method accessible through Thrift), from a running Cassandra node to determine whether or not itself is up? (Per Cassandra standards, I'm assuming based on the gossip protocol). Another way to think of what I'm looking for is basically running nodetool ring just on myself, but I'm only interested in knowing whether I'm Up or Down? I'm currently using the describe_cluster method, but earlier today when the commitlogs for a node filled up and it appeared down to the other nodes, describe_cluster() still worked fine, thus failing the check. Thanks, Suan
