Apparently max user process was set very low on the machine.
How to check?ulimit -u
Set it to unlimited /etc/security/limits.conf
* soft nprocs unlimited* hard nprocs unlimited


From: as...@outlook.com
To: user@cassandra.apache.org
Subject: RE: java.lang.OutOfMemoryError: unable to create new native thread
Date: Fri, 15 Mar 2013 18:57:05 -0500




I think I figured out where the issue is. I will keep you posted soon.

From: as...@outlook.com
To: user@cassandra.apache.org
Subject: java.lang.OutOfMemoryError: unable to create new native thread
Date: Fri, 15 Mar 2013 17:54:25 -0500




I have a Cassandra node that is going down frequently with 
'java.lang.OutOfMemoryError: unable to create new native thread". Its a 16GB VM 
out of which 4GB is set as Xmx and there are no other process running on the 
VM.  I have about 300 clients connecting to this node on an average. I have no 
indication from vmstats/SAR that my VM has used more memory or is memory 
hungry. Doesn't indicate a memory issue to me. Appreciate any pointers to this.
System Specs: 2CPU16GBRHEL 6.2


Thank you.                                                                      
          
                                          

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