I did a sort of fresh install of master and while the server was still parsing plugins, the agent tried to plugin update, which failed. As result, the agent spammed the logs with tens of thousands of lines like below. We should throttle the agents efforts here 2013-12-04 10:36:05,893 ERROR [main] (org.rhq.enterprise.agent.AgentMain)- {AgentMain.plugin-update-failure}Failed to update the plugins.. Cause: java.lang.IllegalStateException: The sender object is currently not sending commands now. Command not sent: [Command: type=[remotepojo]; cmd-in-response=[false]; config=[{rhq.send-throttle=true}]; params=[{invocation=NameBasedInvocation[getLatestPlugins], targetInterfaceName=org.rhq.core.clientapi.server.core.CoreServerService}]] 2013-12-04 10:36:05,893 ERROR [main] (org.rhq.enterprise.agent.AgentMain)- {AgentMain.plugin-update-failure}Failed to update the plugins.. Cause: java.lang.IllegalStateException: The sender object is currently not sending commands now. Command not sent: [Command: type=[remotepojo]; cmd-in-response=[false]; config=[{rhq.send-throttle=true}]; params=[{invocation=NameBasedInvocation[getLatestPlugins], targetInterfaceName=org.rhq.core.clientapi.server.core.CoreServerService}]] 2013-12-04 10:36:05,893 ERROR [main] (org.rhq.enterprise.agent.AgentMain)- {AgentMain.plugin-update-failure}Failed to update the plugins.. Cause: java.lang.IllegalStateException: The sender object is currently not sending commands now. Command not sent: [Command: type=[remotepojo]; cmd-in-response=[false]; config=[{rhq.send-throttle=true}]; params=[{invocation=NameBasedInvocation[getLatestPlugins], targetInterfaceName=org.rhq.core.clientapi.server.core.CoreServerService}]] 2013-12-04 10:36:05,894 ERROR [main] (org.rhq.enterprise.agent.AgentMain)- {AgentMain.plugin-update-failure}Failed to update the plugins.. Cause: java.lang.IllegalStateException: The sender object is currently not sending commands now. Command not sent: [Command: type=[remotepojo]; cmd-in-response=[false]; config=[{rhq.send-throttle=true}]; params=[{invocation=NameBasedInvocation[getLatestPlugins], targetInterfaceName=org.rhq.core.clientapi.server.core.CoreServerService}]]
see my comment in bug #1030063 - i think the fix introduced by that BZ causes this
*** This bug has been marked as a duplicate of bug 1030063 ***