RFR (L): 8046148: JEP 158 Unified JVM Logging (original) (raw)

Chris Newland cnewland at chrisnewland.com
Tue Sep 15 13:47:16 UTC 2015

Rather than decorating the values, would it be so bad to print empty brackets [] when a log field is ommitted?

Wastes 2 chars per ommitted field but reduces ambiguity and simplifies parsing?

-Chris

On Tue, September 15, 2015 13:46, Staffan Larsen wrote:

Some way of differentiating the tid and pid decorations would be good. Even if you specify them in a different order on the command line, they will always show up in the same order which can be even more confusing.

Maybe prefix them with ‘p’ and ’t’:

[2015-09-15T10:08:40.407-0100][0.203s][p91539][t4867][info ][logging] Log configuration fully initialized. Or postfix: [2015-09-15T10:08:40.407-0100][0.203s][91539p][4867t][info ][logging] Log configuration fully initialized. Or label (but this is getting verbose): [2015-09-15T10:08:40.407-0100][0.203s][pid=91539][tid=4867][info ][logging] Log configuration fully initialized. Other ideas?

On 15 sep 2015, at 14:27, Staffan Larsen <staffan.larsen at oracle.com> wrote:

On 15 sep 2015, at 14:20, Kirk Pepperdine <kirk at kodewerk.com> wrote:

Just for completeness: there can be more than 3 bracket pairs if you configure additional decorations: $ java -Xlog:all::uptime,time,pid,tid,level,tags Hello [2015-09-15T10:08:40.407-0100][0.203s][91539][4867][info ][logging] Log configuration fully initialized. Are there a finite number of decorations? Is the order fixed or how would one tell the diff between pid and tid? May I refer to the JEP: ------------ Decorations Logging messages are decorated with information about the message. Here is a list of the possible decorations: • time -- Current time and date in ISO-8601 format • uptime -- Time since the start of the JVM in seconds and milliseconds (e.g., 6.567s) • timemillis -- The same value as generated by System.currentTimeMillis() • uptimemillis -- Milliseconds since the JVM started • timenanos -- The same value as generated by System.nanoTime() • uptimenanos -- Nanoseconds since the JVM started • pid -- The process identifier • tid -- The thread identifier • level -- The level associated with the log message • tags -- The tag-set associated with the log message Each output can be configured to use a custom set of decorators. The order of them is always the one above though. The decorations to be used can be configured by the user in runtime. Decorations will be prepended to the log message Example: [6.567s][info][gc,old] Old collection complete ------------

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