What is persist in Spark

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Can anyone explain what persist() function in Spark?

Jul 2, 2019 in Apache Spark by Tina

recategorized Jul 4, 2019 by Gitika 289 views

1 answer to this question.

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Hi,

Spark’s RDDs are by default recomputed each time you run an action on them. If you would like to reuse an RDD in multiple actions, you can ask Spark to persist it using RDD.persist().

After computing, it the first time, Spark will store the RDD contents in memory (partitioned across the machines in your cluster), and reuse them in future actions. Persisting RDDs on disk instead of memory is also possible.

answered Jul 2, 2019 by Gitika
• 65,890 points

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