seniorApache Spark
Advanced Checkpointing: Local vs Reliable.
Updated May 5, 2026
Short answer
Reliable checkpointing saves to HDFS/S3; local checkpointing saves to executor disk.
Deep explanation
Reliable checkpointing truncates the RDD lineage and is slow. Local checkpointing is faster but doesn't protect against node failure (it's for preventing long lineage stacks in iterative algorithms).
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