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Continuous high CPU usage Cassandra compaction queue too large and unable to communicate to JMX on 12.0

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Applies to

  • NetApp StorageGRID 12.0
  • NetApp StorageGRID 12.1

Issue

  • Continuous high CPU usage (close to or at 100%) observed on (multiple) StorageGRID nodes where the main source of high CPU usage is Cassandra.
  • StorageGRID UI may report the following alerts and self-resolve:
    • Cassandra communication error
    • Cassandra auto-compactor error
    • Unable to communicate with node for jmx service
  • Running grep ComparableTimSort.ensureCapacity /var/local/log/cassandra/jstack/jstack.log | wc -l on an affected node shows a high amount (hundreds)

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