http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter Software, Support, and Training for Apache Cassandra en-US Wed, 19 Jun 2013 02:06:48 +0000 http://bbpress.org/?v=1.0.3 q http://www.datastax.com/support-forums/search.php http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter/page/2#post-919 Thu, 22 Dec 2011 23:50:39 +0000 thobbs 919@http://www.datastax.com/support-forums/ <p>The number that OpsCenter shows is also the number of writes/reads that are coordinated -- basically, it should be close to matching the number of writes/reads per second that your application is doing.</p> <p>The number that cfstats reports are local read/write counts. This means that if you have RF=3, you'll see 3x as many reads/writes at the cfstats level. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter/page/2#post-918 Thu, 22 Dec 2011 23:28:25 +0000 Anonymous 918@http://www.datastax.com/support-forums/ <p>I calculated read requests per second by comparing nodetool cfstats(for whole keyspace) difference. So I don't understand why # of request per second at cluster level reported in opscenter is smaller than # of request per second at node level calculated from nodetool cfstat. # at cluster level should be bigger as it should be sum of # from all nodes. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter/page/2#post-917 Thu, 22 Dec 2011 22:37:10 +0000 thobbs 917@http://www.datastax.com/support-forums/ <p>nodetool cfstats reports a total number of reads that node has done since it last started. OpsCenter is reporting the number reads per second that the whole cluster is doing. Does that explain the difference? </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter/page/2#post-916 Thu, 22 Dec 2011 21:15:26 +0000 Anonymous 916@http://www.datastax.com/support-forums/ <p>I am seeing # of read requests cluster wide in opscenter is much smaller than what nodetool cfstat's reported at Keyspace level at node level. How could this happen? </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-907 Wed, 21 Dec 2011 18:20:48 +0000 thobbs 907@http://www.datastax.com/support-forums/ <p>Yes, nodetool displays stats for a single node, not for the cluster.</p> <p>I'm not sure I understand your second questions, but if you are asking if OpsCenter gets its read/write latency numbers from the same place as nodetool cfstats, the answer is yes, but only for the column family specific latencies. The latencies on the dashboard are slightly different, as they are from the perspective of the coordinator node, rather than the node reading/writing data locally. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-906 Wed, 21 Dec 2011 17:51:00 +0000 Anonymous 906@http://www.datastax.com/support-forums/ <p>Hi Nick, </p> <p>"Nodetool cfstats displays the total read/write counts for column families." at node level, not at cluster level, right?<br /> also does read/write latency also come from cfstats result? </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-897 Wed, 21 Dec 2011 01:43:03 +0000 nickmbailey 897@http://www.datastax.com/support-forums/ <p>"how does opscenter count # of reads or writes?"</p> <p>Nodetool cfstats displays the total read/write counts for column families. So these numbers are the total number of reads/writes that have been performed on a column family since the cassandra process started. OpsCenter uses this value to display the number of reads/writes per second happening in the cluster. This number more accurately represents the current state of the cluster.</p> <p>"can opscenter client/server share same cassandra host?"</p> <p>Yes, the agent and daemon can run on the same host. Are you using different ports for the two port settings? That error either indicates you are attempting to use the same port for both settings or something else on your machine is already listening on the agent api port. Is it possible you already have a running agent process? If you attempted to start two agent processes you would see that error. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-896 Wed, 21 Dec 2011 01:41:32 +0000 Anonymous 896@http://www.datastax.com/support-forums/ <p>please ignore my 2nd question. an opscenter client/server share same cassandra host? </p> <p>I forgot to kill previous client process. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-895 Wed, 21 Dec 2011 01:30:52 +0000 Anonymous 895@http://www.datastax.com/support-forums/ <p>2nd question: can opscenter client/server share same cassandra host? I tried to do that, but client log shows error as: </p> <p> INFO [StompConnection receiver] 2011-12-20 18:29:14,732 Jetty server started<br /> ERROR [Jetty] 2011-12-20 18:29:15,372 Exception running Jetty, restarting: java.net.BindException: Address already in use </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-894 Wed, 21 Dec 2011 00:46:04 +0000 Anonymous 894@http://www.datastax.com/support-forums/ <p>hi, one more question.</p> <p>how does opscenter count # of reads or writes? # of request showed in opscenter graph are much lower comparing to counts from nodetool cfstats. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-893 Tue, 20 Dec 2011 22:04:39 +0000 Anonymous 893@http://www.datastax.com/support-forums/ <p>thanks, using IP worked. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-892 Tue, 20 Dec 2011 21:56:18 +0000 thobbs 892@http://www.datastax.com/support-forums/ <p>You need to use the IP address of the agent rather than its hostname. This is also set in address.yaml. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-891 Tue, 20 Dec 2011 21:51:17 +0000 Anonymous 891@http://www.datastax.com/support-forums/ <p>thanks for reply.</p> <p>I changed ports to 41620/41621. I see following errors on opscenter host.<br /> slcdbx1035 is client which has agent manually installed and it has no errors in agent.log.</p> <p>Any idea?</p> <p>2011-12-20 14:46:18-0700 [] ERROR: Error collecting datacenter: No agents available to query.<br /> 2011-12-20 14:47:27-0700 [] INFO: Agent for ip slcdbx1035 is version u'2.4'<br /> 2011-12-20 14:48:18-0700 [] ERROR: Error collecting datacenter: No agents available to query. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-890 Tue, 20 Dec 2011 21:43:26 +0000 thobbs 890@http://www.datastax.com/support-forums/ <p>OpsCenter does not yet support multiple clusters, but that's something we're planning to support soon in the Enterprise version, probably some time in the first half of 2012. </p> http://www.datastax.com/support-forums/topic/are-6162061621-ports-configurable-in-community-version-of-opscenter#post-889 Tue, 20 Dec 2011 21:30:29 +0000 Anonymous 889@http://www.datastax.com/support-forums/ <p>thanks thobbs, let me try that.</p> <p>btw does opscenter work with multiple clusters? </p>