FAQ
err, "ps aux", not "ps".

Alex
On Fri, Jul 30, 2010 at 3:19 PM, Alex Loddengaard wrote:

What does "ps" show you? How much memory is being used by the jobtracker,
and how large is its heap (loop for HADOOP_HEAPSIZE in hadoop-env.sh)? Also
consider turning on GC logging, which will find its way to the jobtracker
.out log in /var/log/hadoop:

<http://java.sun.com/developer/technicalArticles/Programming/GCPortal/>

Alex

On Fri, Jul 30, 2010 at 3:10 PM, jiang licht wrote:

http://server:50030/jobtracker.jsp generates the following error message:

HTTP ERROR: 500

GC overhead limit exceeded

RequestURI=/jobtracker.jsp
Caused by:

java.lang.OutOfMemoryError: GC overhead limit exceeded

Powered by Jetty://

The jobtracker is running below the limit. But "hadoop job -status" seems
to halt and does not response ...

The last 2 lines of jobtracker logs:

2010-07-30 13:53:18,482 DEBUG org.apache.hadoop.mapred.JobTracker: Got
heartbeat from: tracker_host1:localhost.localdomain/127.0.0.1:53914(restarted: false initialContact: false acceptNewTasks: true) with
responseId: -31252
2010-07-30 13:55:32,917 DEBUG org.apache.hadoop.mapred.JobTracker:
Starting launching task sweep

Any thought about this?

Thanks!
--Michael

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