Q:

How do I read mesos logs ? I mean can somebody please explain whats the meaning of each argument?

I0909 22:47:01.240753 21904 sched.cpp:635] Scheduler::statusUpdate took    23007ns
I0909 22:47:01.240617 21904 master.cpp:3600] Sending 1 offers to framework 20140909-224659-16842879-44263-21883-0000

What is I0909? What is the date/timestamp format used? What pattern does it use ? 

A:

This is a default format of glog libraray
 [IWEF]mmdd hh:mm:ss.uuuuuu threadid file:line]

For example 
I0909 22:47:01.240753 21904 sched.cpp:635] Scheduler::statusUpdate took    23007ns

I  -- Level
09 -- month
09 -- date
22 -- hour
47 -- minute
01 -- second
240753 -- micro second
21904  -- thread id
sched.cpp -- source file
635       -- source file line
Scheduler::statusUpdate took    23007ns -- message

