> On Mar 23, 2017, at 1:06, Anthony Maire <maire.anth...@gmail.com> wrote: > > Thanks for these answers > > @Ralph : that was the kind of idea I had in mind : changing the > RollingFileManager.asyncExecutor to be a ScheduledThreadPoolExecutor, and > based on some configuration, submitting task to be executed after a random > delay. However with this kind of approach, special treatment should be made > if the manager is stopped with some pending delayed tasks in it.
I'm okay with randomization except for this last bit about "special treatment...". Let's not make it too fancy. If the manager is stopped before it rolled over, then it didn't roll over, just like it works currently. I don't see the point of adding extra logic to trigger a rollover when the manager is stopped within the randomized time window. > > @Matt : Cron policy can be a solution, but I don't know how to inject some > random element in this to make the file roll at midnight + X random > seconds. Since there is a lot of JVM to manage and some of them can be > moved from a machine to another, I need to have a single log4j2.xml file > for all environments. Moreover, our system administrators are reluctant to > have something based on a shell-specific feature (such has the $RANDOM > variable from bash) > > Anthony > > 2017-03-22 16:31 GMT+01:00 Ralph Goers <ralph.go...@dslextreme.com>: > >> These are separate JVMs, so having a single executor would be of no help. >> >> I believe the only way to do what you are asking for is to add >> configuration so that the asynchronous thread has a semi-random delay when >> it starts. >> >> Ralph >> >>> On Mar 22, 2017, at 7:58 AM, Greg Thomas <greg.d.tho...@gmail.com> >> wrote: >>> >>>> One common issue we have with that framework (and I assume we can have >> the >>>> same with log4j2) is that all of our JVMs (we can have more than 50 >> JVMs on >>>> the same server in production) roll their file at midnight. >>>> >>>> When this happens, the system became often not usable for a few seconds >>>> because of the simultaneous zipping of all the rolled files that >> overload >>>> the CPU (although zipping is done in a specific background thread). >>> >>> ISTR that with the most recent versions of log4j, these threads are in a >>> thread pool so that they are properly shutdown at the right time. I >> wonder >>> if it's possible (or could be possible) to somehow inject a thread pool >> in >>> to log4j for this rollover, so that for you use case you could inject a >>> single thread executor, so only one thread is ever compressing at a time. >>> >>> Just a thought, anyway, >>> >>> Greg >>> >>> On 22 March 2017 at 13:47, Anthony Maire <maire.anth...@gmail.com> >> wrote: >>> >>>> Hi >>>> >>>> We are currently using another logging framework in production, but I'm >>>> pushing to change it for log4j2. >>>> >>>> One common issue we have with that framework (and I assume we can have >> the >>>> same with log4j2) is that all of our JVMs (we can have more than 50 >> JVMs on >>>> the same server in production) roll their file at midnight. >>>> >>>> When this happens, the system became often not usable for a few seconds >>>> because of the simultaneous zipping of all the rolled files that >> overload >>>> the CPU (although zipping is done in a specific background thread). To >>>> reduce this effect, we are combining a time based rolling policy with a >>>> sized based policy to zip smaller files, but this is not enough to make >> the >>>> system fully responsive at midnight. >>>> >>>> A pretty cool feature for us to avoid this issue is to have the >> possibility >>>> when a rolling is triggered because of a time based policy to change >> file >>>> immediately, but to wait for a random amount of time (within a >> configurable >>>> limit) before starting the compression. This random delay should help a >> lot >>>> to avoid contention on CPU cycles. >>>> >>>> Does log4j2 have something to solve this kind of issue ? If not, would >> you >>>> accept a pull request for this (I will open a Jira if needed) ? >>>> >>>> Regards, >>>> Anthony >>>> >> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: log4j-user-unsubscr...@logging.apache.org >> For additional commands, e-mail: log4j-user-h...@logging.apache.org >> >> --------------------------------------------------------------------- To unsubscribe, e-mail: log4j-user-unsubscr...@logging.apache.org For additional commands, e-mail: log4j-user-h...@logging.apache.org
