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Worker

The main functions of Celeborn Worker are:

  • Store, serve, and manage PartitionLocation data. See Storage
  • Traffic control through Back Pressure and Congestion Control. See Traffic Control
  • Support rolling upgrade through Graceful Shutdown
  • Support elasticity through Decommission Shutdown
  • Self health check

Celeborn Worker has four dedicated servers:

  • Controller handles control messages, i.e. ReserveSlots, CommitFiles, and DestroyWorkerSlots
  • Push Server handles primary input data, i.e. PushData and PushMergedData, and push related control messages
  • Replicate Server handles replica input data, it has the same logic with Push Server
  • Fetch Server handles fetch requests, i.e. ChunkFetchRequest, and fetch related control messages