How to Tune OEM 13c Agent Parameters when Agent is Monitoring Big Amount of Targets

In Exadata environment, the OEM agent is monitoring up to one hundred of targets. The agent always stopped or bounced by itself with the following different errors. This post demonstrates how to tune the agent parameters to improve the agent satiability and performance.

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OEM Agent Throws Error “Internal error detected: oracle.sysman.gcagent.task.TaskZombieException:oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask:620”

Apply some hidden parameters into emd.properties file, then bounce the agent. It might fix some internal issues.

In OEM 13c, a couple of OEM agents reported some internal errors  like :

Internal error detected: oracle.sysman.gcagent.task.TaskZombieException:oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask:620

Internal error detected: oracle.sysman.gcagent.task.TaskZombieException:oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask:621

From: oracle 
Sent: Monday, 13 February 2017 10:41 AM
To: 
Subject: EM Event: Critical:ractest:3872 - Internal error detected: oracle.sysman.gcagent.task.TaskZombieException:oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask:620.

Host=ractest
Target type=Agent 
Target name=ractest:3872 
Categories=Diagnostics 
Message=Internal error detected: oracle.sysman.gcagent.task.TaskZombieException:oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask:620. 
Severity=Critical 
...
..
.
Update Details:
Internal error detected: oracle.sysman.gcagent.task.TaskZombieException:oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask:620.

Extracted from gcagent.log :

2017-02-13 10:10:00,329 [256:7761FFD4] WARN - IntervalSchedule: Skip schedule [rac_database:RACTEST:observer_11g] - skipping due to execution time exceeding interval
2017-02-13 10:10:00,329 [257:B85D2018:GC.Executor.6 (oracle_database:RACTEST:Response)] WARN - IntervalSchedule: Skip schedule [oracle_database:RACTEST:Response] - skipping due to execution time exceeding interval
2017-02-13 10:10:00,329 [258:5A4306F7:GC.Executor.7 (rac_database:RACTEST:observer_11g)] WARN - Action result processing failure rac_database.RACTEST::observer_11g
java.lang.InterruptedException 
 at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1302)
...
..
.
oracle.sysman.gcagent.task.TaskZombieException: task declared as a zombie
 at oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask.accountedCall(TaskFutureImpl.java:620)
 at oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask.call(TaskFutureImpl.java:643)
 at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
 at java.util.concurrent.FutureTask.run(FutureTask.java:138)
 at oracle.sysman.gcagent.task.TaskFutureImpl.run1(TaskFutureImpl.java:380)
...
..
. 

 at java.lang.Thread.run(Thread.java:662)
2017-02-13 10:10:00,331 [257:GC.Executor.6] ERROR - Critical error:
oracle.sysman.gcagent.task.TaskZombieException: task declared as a zombie
 at oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask.accountedCall(TaskFutureImpl.java:620)
 at oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask.call(TaskFutureImpl.java:643)

WORKAROUND

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