CheckpointRestart
Checkpoint restart is a fault tolerance technique used to save and restore the state of a running computation so it can resume after a failure, crash, or migration. A checkpoint captures enough of a program’s state to restart execution from a known point, typically including memory contents, CPU registers, and open resources such as files or network connections. In distributed applications it may also capture the state of communication channels and synchronization data to restore a consistent global snapshot.
Checkpointing approaches are broadly categorized as application-level and system-level. In application-level checkpointing, the program or runtime
Checkpoints may be full or incremental, and can be stored on local disks, parallel file systems, or
On restart, the system reloads the saved state and resumes execution. In distributed environments, restart may
Challenges include performance overhead during normal operation, ensuring consistency for in-flight messages, large state sizes, and