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With this commit we specify `level` in JVM logs. `level` helps to filter more severe messages from mere debugging messages in logs and with this change we are able to use it also for JVM logs. Here are a few example lines: Before: ``` [2022-12-15T06:19:16.936+0000][15181][gc,start ] GC(0) Pause Young (Normal) (G1 Evacuation Pause) ``` After: ``` [2022-12-15T06:22:27.932+0000][16320][info][gc,start ] GC(0) Pause Young (Normal) (G1 Evacuation Pause) [2022-12-15T06:22:27.932+0000][16320][debug][gc,age ] GC(0) Desired survivor size 14680064 bytes, new threshold 15 (max threshold 15) [2022-12-15T06:22:27.935+0000][16320][info ][gc,phases ] GC(0) Pre Evacuate Collection Set: 0.1ms [2022-12-15T06:22:27.935+0000][16320][trace][gc,age ] GC(0) Age table with threshold 15 (max threshold 15) ``` Notice, that the log level might have trailing spaces. See also https://docs.oracle.com/en/java/javase/19/docs/specs/man/java.html#xlog-tags-and-levels for the available log levels.
52 lines
2 KiB
Text
52 lines
2 KiB
Text
[[gc-logging]]
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[discrete]
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==== GC logging settings
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By default, {es} enables garbage collection (GC) logs. These are configured in
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<<set-jvm-options,`jvm.options`>> and output to the same default location as
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the {es} logs. The default configuration rotates the logs every 64 MB and
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can consume up to 2 GB of disk space.
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You can reconfigure JVM logging using the command line options described in
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https://openjdk.java.net/jeps/158[JEP 158: Unified JVM Logging]. Unless you
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change the default `jvm.options` file directly, the {es} default
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configuration is applied in addition to your own settings. To disable the
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default configuration, first disable logging by supplying the
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`-Xlog:disable` option, then supply your own command line options. This
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disables __all__ JVM logging, so be sure to review the available options
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and enable everything that you require.
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To see further options not contained in the original JEP, see
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https://docs.oracle.com/en/java/javase/13/docs/specs/man/java.html#enable-logging-with-the-jvm-unified-logging-framework[Enable
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Logging with the JVM Unified Logging Framework].
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[[gc-logging-examples]]
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[discrete]
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==== Examples
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Change the default GC log output location to `/opt/my-app/gc.log` by
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creating `$ES_HOME/config/jvm.options.d/gc.options` with some sample
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options:
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[source,shell]
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----
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# Turn off all previous logging configuratons
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-Xlog:disable
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# Default settings from JEP 158, but with `utctime` instead of `uptime` to match the next line
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-Xlog:all=warning:stderr:utctime,level,tags
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# Enable GC logging to a custom location with a variety of options
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-Xlog:gc*,gc+age=trace,safepoint:file=/opt/my-app/gc.log:utctime,level,pid,tags:filecount=32,filesize=64m
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----
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Configure an {es} <<docker,Docker container>> to send GC debug logs to
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standard error (`stderr`). This lets the container orchestrator
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handle the output. If using the `ES_JAVA_OPTS` environment variable,
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specify:
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[source,sh]
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----
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MY_OPTS="-Xlog:disable -Xlog:all=warning:stderr:utctime,level,tags -Xlog:gc=debug:stderr:utctime"
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docker run -e ES_JAVA_OPTS="$MY_OPTS" # etc
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----
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