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从 Opscenter 5 通过 apt 在 Ubuntu 14.10 LTS 上升级到最新的 DSE Opscenter 6.0。全新安装后，3-dc/6 节点 DSE 4.8 集群中的 3-4 个代理报告问题，如图所示。

Opscenter 代理状态页面

节点上的代理日志显示问题如下：

 INFO [async-dispatch-22] 2016-07-13 22:38:46,208 Starting monitored database connection.
 ERROR [async-dispatch-22] 2016-07-13 22:39:00,566 Can't connect to Cassandra (All host(s) tried for query failed (tried: /172.30.0.217:9042 (com.datastax.driver.core.exceptions.OperationTimedOutException: [/172.30.0.217] Operation timed out))), retrying soon.
  INFO [async-dispatch-22] 2016-07-13 22:39:00,570 Starting JMXComponent
 ERROR [async-dispatch-22] 2016-07-13 22:40:00,631 Error starting JMXComponent
 java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
        java.net.SocketTimeoutException: Read timed out]
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:369)
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:249)
        at opsagent.jmx$create_jmx_pool_with_config$wrapper__11498.doInvoke(jmx.clj:216)
        at clojure.lang.RestFn.invoke(RestFn.java:439)
        at opsagent.jmx.JMXComponent.start(jmx.clj:320)
        at com.stuartsierra.component$fn__8837$G__8831__8839.invoke(component.clj:4)
        at com.stuartsierra.component$fn__8837$G__8830__8842.invoke(component.clj:4)
        ........

或者

INFO [async-dispatch-22] 2016-07-13 22:40:00,635 Starting JMXComponent
 ERROR [async-dispatch-22] 2016-07-13 22:41:00,676 Error starting JMXComponent
 java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
        java.net.SocketTimeoutException: Read timed out]
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:369)
        at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:249)
        at opsagent.jmx$create_jmx_pool_with_config$wrapper__11498.doInvoke(jmx.clj:216)
        at clojure.lang.RestFn.invoke(RestFn.java:439)
        at opsagent.jmx.JMXComponent.start(jmx.clj:320)
        at com.stuartsierra.component$fn__8837$G__8831__8839.invoke(component.clj:4)
        at com.stuartsierra.component$fn__8837$G__8830__8842.invoke(component.clj:4)
        at clojure.lang.Var.invoke(Var.java:379)
        at clojure.lang.AFn.applyToHelper(AFn.java:154)

这是在同一个 DSE 4.8 集群上运行之前的 Opscenter 2 年没有任何问题的集群。非常感谢任何有关故障排除的提示。

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