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CM Server 5.2 hangs due to "Detected pause in JVM or host machine

CM Server 5.2 hangs due to "Detected pause in JVM or host machine

Explorer

I found that CM server 5.2 hangs intermittently(sometimes it hangs within a week, sometimes hangs after running for two weeks):

 

# service cloudera-scm-server status
cloudera-scm-server dead but pid file exists

 

And the last few lines of cloudera-scm-server.log shows:

 

2015-02-01 03:11:49,047 INFO JvmPauseMonitor:com.cloudera.enterprise.debug.JvmPauseMonitor: Detected pause in JVM or host machine (e.g. a stop the world GC, or JVM not scheduled): paused approximately 2901ms: GC pool 'ParNew' had collection(s): count=1 time=21ms, GC pool 'ConcurrentMarkSweep' had collection(s): count=2 time=3020ms
2015-02-01 03:11:49,060 INFO JvmPauseMonitor:com.cloudera.enterprise.debug.JvmPauseMonitor: Detected pause in JVM or host machine (e.g. a stop the world GC, or JVM not scheduled): paused approximately 2914ms: GC pool 'ParNew' had collection(s): count=1 time=21ms, GC pool 'ConcurrentMarkSweep' had collection(s): count=2 time=3020ms
2015-02-01 03:11:54,106 INFO JvmPauseMonitor:com.cloudera.enterprise.debug.JvmPauseMonitor: Detected pause in JVM or host machine (e.g. a stop the world GC, or JVM not scheduled): paused approximately 4546ms: no GCs detected.
2015-02-01 03:11:54,107 INFO JvmPauseMonitor:com.cloudera.enterprise.debug.JvmPauseMonitor: Detected pause in JVM or host machine (e.g. a stop the world GC, or JVM not scheduled): paused approximately 4558ms: no GCs detected.

 

How can I fix this problem? Thx!

Innovation Never Die
3 REPLIES 3

Re: CM Server 5.2 hangs due to "Detected pause in JVM or host machine

New Contributor

iam having the same issue please fix it.

 

Re: CM Server 5.2 hangs due to "Detected pause in JVM or host machine

Expert Contributor

Please configure more heap memory for the Cloudera Mangager process, follow instructions as shown in Increasing Max Heap Size | Cloudera Manager Service Control Manager

 

Please note those messages which state "no GCs detected" indicate the host is overloaded cpu wise.

Re: CM Server 5.2 hangs due to "Detected pause in JVM or host machine

Community Manager

Hi @nkp,

 

What is your Cloudera Manager version?

 

To follow up with gziglgldrum's post, in case you can not access the article, here are some details copied from there:

 

To configure the maximum heap size of the SCM process, please do:

1) Edit the CMF_JAVA_OPTS property in the /etc/default/cloudera-scm-server file.
2) Alter last line of the file:
export CMF_JAVA_OPTS="-Xmx2G -XX:MaxPermSize=256m ..."
3) To configure more heap memory to Cloudera Manager, please change -Xmx2G to bigger value.

For example, -Xmx4G.

Note:  -Xmx2G option specifies 2 GB of RAM.
4) Restart Cloudera Manager by running below command:
sudo service cloudera-scm-server restart

 

You may also want to read this documentation to find out what is the recommended heap size for your Cloudera Manager:

https://www.cloudera.com/documentation/enterprise/6/release-notes/topics/rg_hardware_requirements.ht...

 

Thanks and hope this helps,

Li

Li Wang, Technical Resolution Manager


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