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StateCache

StateCache is an abstraction of state caches that can cache a Dataset and uncache them all.

Contract

SparkSession

spark: SparkSession

SparkSession the cached RDDs belong to

Implementations

Cached RDDs

cached: ArrayBuffer[RDD[_]]

StateCache tracks cached RDDs in cached internal registry.

cached is given a new RDD when StateCache is requested to cache a Dataset.

cached is used when StateCache is requested to get a cached Dataset and uncache.

Caching Dataset

cacheDS[A](
  ds: Dataset[A],
  name: String): CachedDS[A]

cacheDS creates a new CachedDS.

cacheDS is used when:

Uncaching All Cached Datasets

uncache[A](
  ds: Dataset[A],
  name: String): CachedDS[A]

uncache uses the isCached internal flag to avoid multiple executions.

uncache is used when:


Last update: 2020-09-28