Hello Matt, Are you by any chance running inputs that have the force_rdns flag 
set?  

---HenrikJ

On 2. jun. 2015 kl. 17.37.16 CEST, Matt Hines <[email protected]> 
wrote:Hey guys, We've just updated our Graylog setup by moving the ES to 
another box to give it space to breathe.  But now we're seeing a large increase 
in msg/s coming into the graylog-server, at peak times, between 600-1200. This 
amount is only going to get bigger as users increase.  My issue is, when the 
number breaches the 600 msgs/s number, graylog starts to struggle and starts 
filling up its process buffer and the CPU ramps up to 100% and stays there 
until the peak period is over and it has cleared the buffer out. The box is an 
AWS box, 2CPU, 8GB RAM. I have no idea if this hardware should be enough for 
this number of messages? If so, is there some tweaking I can do to optimise the 
system? If not, what would you recommend, I know it's mainly CPU based but 
would it be best to cluster a second box, or increase this box?  Also, at what 
point will I start to lose messages incoming? When the process buffer and 
journal are both full?  We're running Graylog v1.0.2  Thanks for any help!     
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