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  1. Confluence Data Center
  2. CONFSERVER-79961

As an admin, I want date timestamps in Garbage Collection Logging to be enabled by default


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      Problem Definition

      The default Java 11 Garbage Collection Logging settings do not specify any custom sets of decorators.

      CATALINA_OPTS="-Xloggc:$LOGBASEABS/logs/gc-`date +%F_%H-%M-%S`.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M ${CATALINA_OPTS}"

      As a result, default decorators would then be used - uptime, level, and tags. Please refer to the sample GC log snippet below:

      [1.374s][debug][gc,age] GC(0) Desired survivor size 3670016 bytes, new threshold 15 (max threshold 15)
      [1.583s][debug][gc,age] GC(1) Desired survivor size 3670016 bytes, new threshold 1 (max threshold 15)
      [2.020s][debug][gc,age] GC(2) Desired survivor size 17825792 bytes, new threshold 15 (max threshold 15)
      [2.767s][debug][gc,age] GC(4) Desired survivor size 18350080 bytes, new threshold 15 (max threshold 15)
      [4.238s][debug][gc,age] GC(5) Desired survivor size 22020096 bytes, new threshold 15 (max threshold 15)

      Suggested Solution

      To specify a set of decorators in the default Confluence's GC logging as well as to add time decorator, to show current time and date in ISO-8601 format.
      This would be very helpful in troubleshooting performance related issues in Confluence.


      Modify the <Confluence-Installation>/bin/setenv.sh file as follow:

      CATALINA_OPTS="-Xlog:gc+age=debug:file=$LOGBASEABS/logs/gc-`date +%F_%H-%M-%S`.log::filecount=5,filesize=2M ${CATALINA_OPTS}"
      CATALINA_OPTS="-Xlog:gc*:file=$LOGBASEABS/logs/gc-%t.log:tags,time,uptime,level:filecount=5,filesize=2M ${CATALINA_OPTS}"

            ablekhman@atlassian.com Alex Blekhman
            lrura Lauretha Rura
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