NiFi JVM

The NiFi JVM dashboard displays charts for the following JVM related metrics of one or multiple clusters.

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You can view aggregated data or per node by clicking either of the following options.

  • Show Aggregated: Displays the aggregated values of all nodes.
  • Show Per Node: Displays the values per node.

JVM Memory Usage

The JVM Memory Usage chart displays the amount of JVM memory used by processes in the cluster based on the following metrics.

  • Max Heap: The maximum amount of heap memory allocated by the JVM.
  • Committed Non Heap: The amount of allocated memory other than the heap memory in the JVM.
  • Heap Used: The amount of heap memory used by the JVM.
  • Non Heap Memory: The amount of memory other than the heap memory in the JVM.

JVM Threads

The JVM Threads chart displays the following metrics of a thread in a cluster within a time frame.

  • Thread Count: The number of threads.
  • Runnable: The threads that are ready to run or currently running in the JVM.
  • Terminated: The threads that have completed execution.
  • Timed Waiting: The threads waiting for another thread to execute within a particular time.
  • Blocked: The threads that are currently blocked waiting for a lock that is already being used by another thread.

GC Times

The GC Times chart collects and displays the following metrics of JVM garbage collection.

  • Mark Sweep: The time taken for marking and sweeping phase of garbage collection in the JVM.
  • Scavenge: The time taken for scavenging garbage collection in the JVM.