---
title: "Optimizing Spark"
type: concept
source: https://www.jemoka.com/posts/kbhoptimizing_spark/
confidence: high
status: active
---

In the event your domain knowledge can help you make decisions about how spark load-balances or stripes data across worker nodes.
Persistence &ldquo;you should store this data in faster/slower memory&rdquo;
MEMORY_ONLY, MEMORY_ONLY_SER, MEMORY_AND_DISK, MEMORY_AND_DISK_SER, DISK_ONLY
rdd.persist(StorageLevel.MEMORY_AND_DISK) # ... do work ... rdd.unpersist() Parallel Programming
