·
Conductor - initial Framework process
– Score Composer
– Creates Section
Leader processes (one/node)
– Consolidates
massages, to DataStage log
– Manages
orderly shutdown
·
Section
Leader (one per Node)
– Forks Players
processes (one/Stage)
– Manages
up/down communication
·
Players
– The actual
processes associated with Stages
– Combined
players: one process only
– Sends stderr,
stdout to Section Leader
– Establish
connections to other players for data flow
– Clean up upon
completion
• Default Communication:
• SMP: Shared Memory
• MPP: Shared Memory (within hardware node) and TCP
(across hardware nodes)