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• File IO errors. Usually IOException's threw by read/write operations on file system. The following subsystems should be considered as critical:
  
  • WAL
  • Page store
  • Meta store
  • Binary meta store
• IgniteOutOfMemoryException
• OutOfMemoryError (we should have some memory reserved for this case at node startup to increase chances to handle OOM)AssertionError (we should handle assertions as failures in case -ea flag set) (should be covered at Throwable catch for every system worker as well).
  
  

The following system workers are critical and ignite node will be inoperative in case of termination one of this worker:

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