JFR events - Atoti Hub

Atoti implements some custom Java Flight Recording events, that are captured when using the Java Flight Recorder.

Those events are public facing, and allow low-level debugging, but are susceptible to change at any version (major, minor, bugfix).

How to use

It is possible to activate/deactivate an event when launching a JFR. It is recommended to use a configuration files, see jfr --help configure. For example:

<configuration label="Custom" version="2.0">

    <event name="atoti.server.cube.CubeCommitEvent">
        <setting name="enabled">true</setting>
    </event>

    <event name="atoti.server.cube.HierarchyCommitEvent">
        <setting name="enabled">true</setting>
    </event>
</configuration>

Then when launching the java process, the argument -XX:StartFlightRecording:filename=myFileName.jfr,settings=myCustomSettings.jfc must be supplied. To limit the number of events recorded, several JFR options can be used:

period
threshold
throttle (starting with Java 25)

It is also possible to scrub an existing JFR from an event to reduce its size via the scrub command, see jfr --help scrub.

Available events

Event name	Event Label	Default	Meaning	Documentation
`atoti.server.memory.Allocation`	`Memory Allocation`	Disabled	Off-heap memory allocation	Off-Heap Memory Monitoring
`atoti.server.memory.Release`	`Memory Release`	Disabled	Off-heap memory freeing	Off-Heap Memory Monitoring
`atoti.server.cube.AggregatesContributionTaskEvent`	`AggregatesContributionTask`	Disabled (since 6.1.17)	Task that aggregates the updates from the database into the collectors
`atoti.server.cube.ConflatedTransactionProcessingEvent`	`ConflatedTransactionProcessing`	Enabled	Conflation of several epochs by the continuous query engine	Conflating Continuous Query Engine
`atoti.server.cube.provider.ContributionTaskEvent`	`ContributionTask`	Disabled (since 6.1.17)	Task that merges the contribution collectors into the aggregate provider
`atoti.server.cube.provider.RemovalTaskEvent`	`RemovalTask`	Disabled (since 6.1.17)	Task that merges the removal collectors into the aggregate provider
`atoti.server.cube.CubeCommitEvent`	`CubeCommit`	Enabled	Commit event on a cube
`atoti.server.cube.HierarchyCommitEvent`	`HierarchyCommit`	Disabled (since 6.1.17)	Commit event on a hierarchy
`atoti.server.cube.HierarchyPipelineTaskEvent`	`HierarchyPipelineTask`	Disabled (since 6.1.17)	Task that performs contributions from a source partition to one or more hierarchies
`atoti.server.cube.MembersExtractionEvent`	`MembersExtraction`	Disabled (since 6.1.17)	Task that extracts and dictionarizes hierarchy members from fact records
`atoti.server.mdx.MdxSelectQueryEvent`	`MdxSelectQuery`	Enabled	Execution of an MDX SELECT query
`atoti.server.datastore.StorePartitionWorkEvent`	`StorePartitionWork`	Disabled (since 6.1.15)	Work type performed on a store partition