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What is write ahead log(journaling) in Spark?

Question Posted / Kundan Kumar Vats

Answer Posted / Kundan Kumar Vats

Write Ahead Log (WAL), also known as journaling, is a data persistence strategy used by Spark to ensure durability of data operations. It logs all changes to the data before they are applied, so that in case of a failure, the system can recover and apply the same changes again.

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