ks Software, Support, and Training for Apache Cassandra en-US Sat, 25 May 2013 23:53:18 +0000 http://bbpress.org/?v=1.0.3 q http://www.datastax.com/support-forums/search.php http://www.datastax.com/support-forums/topic/a-newbie-question-why-agent-is-needed-for-opscenter#post-8469 Thu, 17 Jan 2013 00:00:25 +0000 KS 8469@http://www.datastax.com/support-forums/ <p>Thanks Nick!This is very insightful </p> http://www.datastax.com/support-forums/topic/a-newbie-question-why-agent-is-needed-for-opscenter#post-8465 Wed, 16 Jan 2013 18:04:11 +0000 nickmbailey 8465@http://www.datastax.com/support-forums/ <p>Yes. It is recommended that you install the agents. I do not have a full list but there are a few things OpsCenter needs agents to determine:</p> <p>* cassandra version<br /> * performance data<br /> * datacenter/rack information<br /> * Run commands like compact/flush/decommission/etc</p> <p>There are other things as well that the agents are needed for. </p> http://www.datastax.com/support-forums/topic/a-newbie-question-why-agent-is-needed-for-opscenter#post-8464 Wed, 16 Jan 2013 18:01:10 +0000 KS 8464@http://www.datastax.com/support-forums/ <p>Thanks Nick for your information! So as long as Thrift port is open, Opscenter can perform well, even without agents. Is there any additional motivation to have agent seperately? For example, is there any information that only agent can report and cannot be obtained by opscenter thru Trift port? </p> http://www.datastax.com/support-forums/topic/a-newbie-question-why-agent-is-needed-for-opscenter#post-8459 Wed, 16 Jan 2013 16:41:40 +0000 nickmbailey 8459@http://www.datastax.com/support-forums/ <p>OpsCenter uses thrift to get a view of the cluster and data in the cluster. This means it can be installed anywhere and as long as the thrift port is available in can gather that information. OpsCenter does need to install agents in order to get some information such as performance metrics for example. </p> http://www.datastax.com/support-forums/topic/a-newbie-question-why-agent-is-needed-for-opscenter#post-8436 Wed, 16 Jan 2013 01:21:40 +0000 KS 8436@http://www.datastax.com/support-forums/ <p>After I start up the OPSCenter,(no agent was installed), I was able to see the whole cluster and all data, CF etc.</p> <p>I am just curious, why do we need to install agent on the Cassandra nodes? What functionality would be missed if no agent is deployed?</p> <p>p.s., I install opscenter on one of the cassandra nodes. Is this the reason why I don't need agent to see the cluster info.? </p> <p>Thanks! </p>