NTP? http://en.wikipedia.org/wiki/Network_Time_Protocol
[http://www.cisco.com/web/europe/images/email/signature/est2014/logo_06.png?ct=1398192119726] Grant Overby Software Engineer Cisco.com<http://www.cisco.com/> grove...@cisco.com<mailto:grove...@cisco.com> Mobile: 865 724 4910 [http://www.cisco.com/assets/swa/img/thinkbeforeyouprint.gif] Think before you print. This email may contain confidential and privileged material for the sole use of the intended recipient. Any review, use, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender by reply email and delete all copies of this message. Please click here<http://www.cisco.com/web/about/doing_business/legal/cri/index.html> for Company Registration Information. From: "Nick R. Katsipoulakis" <nick.kat...@gmail.com<mailto:nick.kat...@gmail.com>> Reply-To: "user@storm.apache.org<mailto:user@storm.apache.org>" <user@storm.apache.org<mailto:user@storm.apache.org>> Date: Thursday, March 19, 2015 at 9:07 AM To: "user@storm.apache.org<mailto:user@storm.apache.org>" <user@storm.apache.org<mailto:user@storm.apache.org>> Subject: Distributed logs coordination Hello all, I came across the following issue in my cluster and I would like to share it with you, in case you have any proposals/solutions: I am running my Storm (0.9.2) application in a 5 node cluster. Each bolt is assigned randomly to one of the available workers and during execution, each worker logs performance information. However, it seems that the clocks of the machines I am using are skewed (some of them have minutes difference between them). For instance, each bolt logs a number of events and also the some custom performance metrics. However, when I try to plot all of the bolts' metrics in one graph (let's say latency), I see that the time lines are not identical. How can I overcome the skewed clocks problem in order to have a single time line of events happening in my cluster? Is there a way that I can have all my bolts get a time-stamp from a single source? Any tutorials on using the metrics framework that comes with Storm? Thanks, Nikos -- Nikolaos Romanos Katsipoulakis, University of Pittsburgh, PhD candidate
