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Answer Posted / Shiv Prakash
Write Ahead Log (WAL) is a data logging technique used by Spark for ensuring durability of writes. It maintains a log that contains all the commands needed to redo and undo the writes, allowing for fast recovery from failures. When a write operation is performed, both the WAL and the final destination are updated. If a failure occurs before the data can be fully written to the destination, Spark can recover by replaying the operations in the WAL.
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