RFR: 7164841: Improvements to the GC log file rotation

Yasumasa Suenaga suenaga.yasumasa at lab.ntt.co.jp
Wed Aug 28 16:54:01 PDT 2013


> I think if the pattern exists in file name, we can just replace them with pid or timestamp so can save a flag:-)

Do you say that you will implement "6950794: Make the GC log file name parameterized" ?

JDK-6950794: Make the GC log file name parameterized
   http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6950794

Patch:
   http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2012-July/004758.html

A few days ago, I introduced this RFE:
   http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2012-July/004758.html
   http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2013-August/008031.html


Yasumasa
   
On 2013/08/29 2:34, Yumin Qi wrote:
> I really hate to add more flags, though it does not hurt with one more since we already have tons of them.
> I think if the pattern exists in file name, we can just replace them with pid or timestamp so can save a flag:-)
>
> Thanks
> Yumin
>
> On 8/28/2013 10:30 AM, Tao Mao wrote:
>> How about a flag AppendDataAndTimeToGCLogFileName (and default is false) or the like?
>>
>> Thanks.
>> Tao
>>
>> On 8/28/13 9:59 AM, Yumin Qi wrote:
>>> Not sure customer really wants to have like
>>>
>>> -Xloggc:app.log[.%p][.%t] (whatever the position of %p and %t)
>>>
>>> at case rotate gc log or not.
>>> I can add parsing for name pattern with %p and %t, but that really needs to have an apprehensive consideration of such change.
>>>
>>> Any other opinion?
>>>
>>> Yumin
>>>
>>> On 8/28/2013 8:30 AM, STIRLING, SCOTT wrote:
>>>> Disk overruns can be limited with dedicated log partitions.
>>>>
>>>> Logs can be pre-parsed with command line text tools into separate runs, which everyone already has to do for stack traces in system out/err logs.
>>>>
>>>> IBM logs work great in PMAT, which also keeps pace with ever-evolving parsing nightmare of detailed Hotspot GC logging :-)
>>>>
>>>> Scott
>>>>
>>>> On Aug 28, 2013, at 11:13 AM, "Kirk Pepperdine" <kirk at kodewerk.com> wrote:
>>>>
>>>>>
>>>>>> Append vs clobber: with or without rotation, -Xloggc always clobbers the last log. That's why people want a time stamp or pid in the gc file name, IMHO.
>>>>> My client just clobbered his log files yet... I'd still *not* want the time stamp because this can potentially accidentally fill production disks. Better that my client over wrote the logs than filled his production disk because he didn't realize the behaviour. And, many don't realize the behaviour, they just follow the admin manual.
>>>>>
>>>>>> Alternatively, give an option to append when -Xloggc is enabled, vs default overwrite.
>>>>> Allowing an append will break all current analysis tooling.
>>>>>
>>>>> Regards,
>>>>> Kirk
>>>>>
>>>>>
>>>



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