Thanks Matthieu, About Metrics library If use this, in s4 whether application class code should add Gauge code, but if tracing PE instances(queue size, or time consuming), how inject Gauge into PE element, seems a bit complex and messy to write Gauge code.
About S4Metrics S4Metrics is a good class which can trace the stream queue size or time etc. But don't know how to use it in S4 application, can you instruct link to describe, another, s4.metrics.config I can not find, which specify the content format, does it have other functions and how to use it. /Sky From: Matthieu Morel [mailto:mmo...@apache.org] Sent: Tuesday, May 28, 2013 6:49 PM To: s4-user@incubator.apache.org Subject: Re: About using Metrics Not sure I understand the question. We use an external library for adding metrics to various parts of the platform. But you have to define explicitly what you measure, by inserting the corresponding metrics hooks. In S4 we tried to factor metrics management in an S4Metrics class, but that is mostly for clarity. See the library documentation here http://metrics.codahale.com/ for more info on how to use the same library, though there are others. Hope this helps, Matthieu On May 28, 2013, at 12:19 , Sky Zhao wrote: If using Metrics in project, not affect source code, I am ready to use inject event into s4, how to do it, Can you give some examples,but the Metrics links is still not clear. Thanks first /Sky
