Hi Rajani, Thanks!! your feedback is very helpful for our project.
On Mon, Jul 7, 2014 at 9:59 AM, Rajani Karuturi <rajani.karut...@citrix.com> wrote: > Hi Ashish, > > It does have timestamp, log level, thread name etc. though we do not > use the level appropriately at some places. > Here is a sample log line: > 2014-07-04 09:00:19,456 WARN [o.a.c.f.j.AsyncJobExecutionContext] > (StatsCollector-3:ctx-0090dd87) Job is executed without a context, setup > psudo job for the executing thread > > We use log4j for logging with a conversion pattern of %d{ISO8601} %-5p > [%c{1.}] (%t:%x) %m%n > description about the pattern can be found here > https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html > > > ~Rajani > > > > On 06-Jul-2014, at 11:53 am, Ashish Sureka <ash...@iiitd.ac.in> wrote: > > We [Professor and PhD Student in Software Engineering at a State University > in India] are working towards a source code analysis tool which can assist > practitioners in writing effecting log statements. There are more than > 10000 log statements in CloudStack (s_logger.error, s_logger.warn, > s_logger.trace, s_logger.info……………….) > > > The focus of this email is on format and consistency of log statements. We > analyzed all the log statements and observe that the log statements prints > a message and variable(s). However it does not print the log level, > timestamp and thread-name. I believe you agree with me that - Information > like timestamp [Date date= new Date(); new Timestamp(date.getTime())] and > thread-name [Thread.currentThread().getName()] is useful for diagnosing > production failure and root-cause analysis. It is also useful in studying > patterns and trends. We have the following questions: > > > 1) Why log-level, timestamp and thread-name is not logged. > > 2) How important (different people may have different opinion) is > Point 1 (mentioning log-level, timestamp and thread-name) > > 3) Is there a standard guideline for developers for writing log > statements – which CloudStack developers need to follow > > 4) Do you use any log-analysis tool? How are logs analyzed (visual > inspection, home-grown tool/program, external open-source/commercial tool)? > > 5) CloudStack can be used in a multi-threaded environment and I am not > clear why the thread name is not printed > > Thanks in advance and appreciate it. We want to build a tool (not just > about format and consistency) that will be practically useful to > practitioners and will make it open-source & publicly available. This is > part of an academic/research study and hence request a response to all > questions. > > > Thanks and Regards, > > > Ashish and Sangeeta > > -- > Ashish Sureka : [Homepage http://www.iiitd.edu.in/~ashish/ ] , [Blog : > http://ashish-sureka-delhi.blogspot.in/ ] > > > -- Regards... Sangeeta Assistant Professor CSE Department @JIIT Noida