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From "Hiller, Dean" <Dean.Hil...@nrel.gov>
Subject Re: cassandra just gone..no heap dump, no log info
Date Wed, 18 Sep 2013 12:59:07 GMT
Swappiness is set to 60 though cassandra recommendations are to turn swap completely off(we
still have not done that as far as I know though) and sure enough linux killed it.

Dean

From: Juan Manuel Formoso <jformoso@gmail.com<mailto:jformoso@gmail.com>>
Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date: Wednesday, September 18, 2013 6:57 AM
To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Subject: Re: cassandra just gone..no heap dump, no log info

This shouldn't happen if you have swap active in the server

On Wednesday, September 18, 2013, Franc Carter wrote:

A random guess - possibly an OOM (Out of Memory) where Linux will kill a process to recover
memory when it is desperately low on memory. Have a look in either your syslog output of the
output of dmesg

cheers


On Wed, Sep 18, 2013 at 10:21 PM, Hiller, Dean <Dean.Hiller@nrel.gov<javascript:_e({},%20'cvml',%20'Dean.Hiller@nrel.gov');>>
wrote:
Anyone know how to debug cassandra processes just exiting?  There is no info in the cassandra
logs and there is no heap dump file(which in the past has shown up in /opt/cassandra/bin directory
for me).

This occurs when running a map/reduce job that put severe load on the system.  The logs look
completely fine.  I find it odd

 1.  No logs of why it exited at all
 2.  No heap dump which would imply there would be no logs as it crashed

Is there any other way a process can die and linux would log it somehow?  (like running out
of memory)

Thanks,
Dean



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