13:48:18,315 ERROR [AD Thread Pool-Global0] DBAgentPollingForUpdate:34

[CommunityUser]

Why am I just now getting this Error with my DB-Agent.  it was working fine on Sat and I came in this Monday morning and I get this :

13:48:08,233 ERROR [AD Thread Pool-Global0] DBAgentPollingForUpdate:34 - Error reading response from Controller
com.singularity.ee.rest.ResponseReadException: java.io.StreamCorruptedException: invalid stream header: 3C726573
at com.singularity.ee.rest.controller.request.ABinaryControllerRequest.<init>(ABinaryControllerRequest.java:61)
at com.singularity.ee.rest.controller.request.AgentPollingConfigurationRequest.<init>(AgentPollingConfigurationRequest.java:24)
at com.singularity.ee.rest.controller.request.DBMonitorConfigRequest.<init>(DBMonitorConfigRequest.java:30)
at com.singularity.ee.agent.dbagent.config.channel.DBAgentPollingForUpdate.getConfigurationResponse(DBAgentPollingForUpdate.java:29)
at com.singularity.ee.agent.configuration.channel.PollingForUpdate.pollForConfigUpdate(PollingForUpdate.java:96)
at com.singularity.ee.agent.configuration.channel.PollingForUpdate.nextTransition(PollingForUpdate.java:40)
at com.singularity.ee.agent.configuration.channel.AgentConfigurationChannel.refreshConfiguration(AgentConfigurationChannel.java:48)
at com.singularity.ee.agent.configuration.channel.AgentConfigurationRefreshTask.run(AgentConfigurationRefreshTask.java:32)
at com.singularity.ee.util.javaspecific.scheduler.AgentScheduledExecutorServiceImpl$SafeRunnable.run(AgentScheduledExecutorServiceImpl.java:107)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at com.singularity.ee.util.javaspecific.scheduler.ADFutureTask$Sync.innerRunAndReset(ADFutureTask.java:335)
at com.singularity.ee.util.javaspecific.scheduler.ADFutureTask.runAndReset(ADFutureTask.java:152)
at com.singularity.ee.util.javaspecific.scheduler.ADScheduledThreadPoolExecutor$ADScheduledFutureTask.access$101(ADScheduledThreadPoolExecutor.java:117)
at com.singularity.ee.util.javaspecific.scheduler.ADScheduledThreadPoolExecutor$ADScheduledFutureTask.runPeriodic(ADScheduledThreadPoolExecutor.java:204)
at com.singularity.ee.util.javaspecific.scheduler.ADScheduledThreadPoolExecutor$ADScheduledFutureTask.run(ADScheduledThreadPoolExecutor.java:234)
at com.singularity.ee.util.javaspecific.scheduler.ADThreadPoolExecutor$Worker.runTask(ADThreadPoolExecutor.java:694)
at com.singularity.ee.util.javaspecific.scheduler.ADThreadPoolExecutor$Worker.run(ADThreadPoolExecutor.java:726)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.StreamCorruptedException: invalid stream header: 3C726573
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:804)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:299)
at com.singularity.ee.util.serialize.JavaSerializer.unmarshalObject(JavaSerializer.java:40)
at com.singularity.ee.rest.controller.request.ABinaryControllerRequest.constructPaylodFromInputTracked(ABinaryControllerRequest.java:131)
at com.singularity.ee.rest.controller.request.ABinaryControllerRequest.constructPaylodFromInput(ABinaryControllerRequest.java:123)
at com.singularity.ee.rest.controller.request.ABinaryControllerRequest.<init>(ABinaryControllerRequest.java:56)
... 17 more

[Arun_Dasetty]

Hi Glenn, 

      It could be the case that recently some agent/machine agent have started such that host id conflict (host name) have resulted, Can you restart db agent as following and see how it goes with error?

shell> java -Dappdynamics.agent.uniqueHostId=My_Database_Agent Host_1 -jar /path/to/<dbAgent_dir>/db-agent.jar