/thread/c45bc7ba788b2357
Regards,
Uma
From: felix gao [gre1...@gmail.com]
Sent: Friday, January 20, 2012 6:42 AM
To: hdfs-user@hadoop.apache.org
Subject: Re: namenode grows overtime
Koji,
There is no Java options specified other than -Xmx24g, what are some
Koji,
There is no Java options specified other than -Xmx24g, what are some of the
recommended options for namenode?
Thanks,
Felix
On Wed, Jan 18, 2012 at 3:39 PM, Koji Noguchi knogu...@yahoo-inc.comwrote:
Hi Felix,
Taking jmap –histo:live pid would tell you what’s occupying the heap.
Hi Felix,
Taking jmap –histo:live pid would tell you what’s occupying the heap.
Are you using UseConcMarkSweepGC?
If yes, and if you see bunch of
java.net.SocksSocketImpl
sun.nio.ch.SocketChannelImpl
from jmap histo outputs, try passing-XX:-CMSConcurrentMTEnabled .
Background:
Felix,
Are you noticing this from the NN Web UI or from proper JVM monitoring
tools? Just so you know, the UI had a flaw that has since been fixed:
https://issues.apache.org/jira/browse/HDFS-94
On Thu, Jan 19, 2012 at 4:53 AM, felix gao gre1...@gmail.com wrote:
Hi guys,
we are running Hadoop
