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What is a serializer in Spark?

Spark/Big Datahard0.3 min readPremium
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Globant
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Expert AnswerPremium
56 wordsInterview-ready
**Serializer**: Converts objects to bytes for shuffle, persistence, broadcast. Default: Java (slow). Kryo: `spark.serializer=org.apache.spark.serializer.KryoSerializer`. **Why Kryo**: 10x faster, smaller payload. Less network and memory. **Trade-off**: Register custom classes for Kryo efficiency: `spark.kryo.classesToRegister`. Unregistered = slower. **Scalability Trade-offs**: Kryo reduces shuffle size; faster jobs....
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