Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8190350

JFR Event com.oracle.jdk.ActiveRecording has incorrect recording start value

    XMLWordPrintable

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 10
    • Fix Version/s: 10
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
      jfr
    • Resolved In Build:
      b33

      Description

      I had JMC running on JDK 10 and dumped the last 5 minutes of the flight recording. After doing this twice (not an exact reproducer, sorry for that), I see a recording listed as "Snapshot" in JMC. That recording has a very strange start time (not 2017-10-30 as expected, but 292278994-08-17 08:12:55). This corresponds to 9223372036854775807 ms, according to JMC. If I look in the json produced by the reference parser, I see the following values:

      {
            "name": "com.oracle.jdk.ActiveRecording",
            "typeId": 1634,
            "startTime": "2017-10-30T09:32:53.360024479Z",
            "duration": "PT0S",
            "values": {
              "startTime": 463718693704,
              "duration": 0,
              "eventThread": {
                "osName": "Worker-4",
                "osThreadId": 78407,
                "javaName": "Worker-4",
                "javaThreadId": 62,
                "group": {
                  "parent": {
                    "parent": null,
                    "name": "system"
                  },
                  "name": "main"
                }
              },
              "stackTrace": null,
              "id": 1,
              "name": "JMC_Default",
              "destination": null,
              "maxAge": 9223372036854775807,
              "maxSize": 104857600,
              "recordingStart": 1509355780868,
              "recordingDuration": 9223372036854775807
            }
          }, {
            "name": "com.oracle.jdk.ActiveRecording",
            "typeId": 1634,
            "startTime": "2017-10-30T09:32:53.360040434Z",
            "duration": "PT0S",
            "values": {
              "startTime": 463718731996,
              "duration": 0,
              "eventThread": {
                "osName": "Worker-4",
                "osThreadId": 78407,
                "javaName": "Worker-4",
                "javaThreadId": 62,
                "group": {
                  "parent": {
                    "parent": null,
                    "name": "system"
                  },
                  "name": "main"
                }
              },
              "stackTrace": null,
              "id": 6,
              "name": "Snapshot",
              "destination": null,
              "maxAge": 9223372036854775807,
              "maxSize": 0,
              "recordingStart": 9223372036854775807,
              "recordingDuration": 9223372036854775807
            }
          }

      Is this snapshot recording event necessary to produce an event for? Should it be visible and used for something, or is it only an artifact of some sort?

        Attachments

          Activity

            People

            Assignee:
            egahlin Erik Gahlin
            Reporter:
            pkroon Per Kroon (Inactive)
            Votes:
            0 Vote for this issue
            Watchers:
            2 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved: