RFR: 7164841: Improvements to the GC log file rotation

Yasumasa Suenaga suenaga.yasumasa at lab.ntt.co.jp
Mon Aug 19 16:48:43 PDT 2013


Hi all,

> I can file a bug for serviceability to have this function together with (1) through jmx or jmc.

I already filed as 7090324.
7090324: gclog rotation via external tool
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7090324

In last year, I tried to implement GC log rotation to jcmd.
I've attached that patch in this email.


Please check it.

Thanks,

Yasumasa


On 2013/08/20 7:52, Yumin Qi wrote:
> Thanks, Ramki
>
> On 8/19/2013 3:31 PM, Srinivas Ramakrishna wrote:
>>
>> Hi Yumin --
>>
>> Somewhat orthogonal to the discussion at hand, and certainly not a code review/discussion (so i
>> apologize for injecting this into $SUBJ) but I wanted to say that log rotation is definitely a useful capability in the field.
>>
>> Have you folks perhaps considered two possible enhancements:
>> (1) rotate logs at a frequency and time specified. (For example, on a daily, weekly or monthly basis.)
> No such consideration at present. This needs an option for specifying the frequency.
>> (2) rotate logs asynchronously upon request. (say via a suitable bean.)
>>
> I can file a bug for serviceability to have this function together with (1) through jmx or jmc.
>
> Thanks
> Yumin
>> If (1) can be simulated by existing means I am all ears.
>>
>> thanks!
>> -- ramki
>>
>>
>>
>> On Thu, Aug 15, 2013 at 8:35 AM, Yumin Qi <yumin.qi at oracle.com <mailto:yumin.qi at oracle.com>> wrote:
>>
>>     Hi,
>>
>>     Can I have your review for this small changes?
>>     http://cr.openjdk.java.net/~minqi/7164841/webrev00/ <http://cr.openjdk.java.net/%7Eminqi/7164841/webrev00/>
>>
>>     This is for a enhancement to add head/tail message to the logging files to assist reading GC output.
>>     1. modified prompt message if invalid arguments used for log rotating;
>>     2. add time and file name message to log file head/tail.
>>     3. for easily identify which log file is current, use file name like <filename>.n.current, after it reaches maximum size, rename it to <filename>.n
>>     On Windows, there is no F_OK (existing test) definition, F_OK is defined as "0" and for _access of VC++, it just describes:
>>
>>     modevalue
>>
>>     	
>>
>>     Checks file for
>>
>>     00
>>
>>     	
>>
>>     Existence only
>>
>>     02
>>
>>     	
>>
>>     Write-only
>>
>>     04
>>
>>     	
>>
>>     Read-only
>>
>>     06
>>
>>     	
>>
>>     Read and write
>>
>>
>>     http://msdn.microsoft.com/en-us/library/1w06ktdy.aspx
>>     The definition are consistent with unistd.h.
>>
>>     Test: JPRT and jtreg.
>>
>>     Thanks
>>     Yumin
>>
>>
>

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