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Stephanie Wang
9d1e750e8f
* Merge task table and task log * Fix test in db tests * Address Robert's comments and some better error checking * Add a LOG_FATAL that exits the program
1.3 KiB
1.3 KiB
Task specifications, task instances and task logs
A task specification contains all information that is needed for computing the results of a task:
- The ID of the task
- The function ID of the function that executes the task
- The arguments (either object IDs for pass by reference or values for pass by value)
- The IDs of the result objects
From these, a task ID can be computed which is also stored in the task specification.
A task represents the execution of a task specification. It consists of:
- A scheduling state (WAITING, SCHEDULED, RUNNING, DONE)
- The target node where the task is scheduled or executed
- The task specification
The task data structures are defined in common/task.h.
The task table is a mapping from the task ID to the task information. It is updated by various parts of the system:
- The local scheduler writes it with status WAITING when submits a task to the global scheduler
- The global scheduler appends an update WAITING -> SCHEDULED together with the node ID when assigning the task to a local scheduler
- The local scheduler appends an update SCHEDULED -> RUNNING when it assigns a task to a worker
- The local scheduler appends an update RUNNING -> DONE when the task finishes execution
The task table is defined in common/state/task_table.h.