c

org.apache.spark.sql.delta.util

DatasetRefCache

class DatasetRefCache[T] extends AnyRef

A Dataset reference cache to automatically create new Dataset objects when the active SparkSession changes. This is useful when sharing objects holding Dataset references cross multiple sessions. Without this, using a Dataset that holds a stale session may change the active session and cause multiple issues (e.g., if we switch to a stale session coming from a notebook that has been detached, we may not be able to use built-in functions because those are cleaned up).

The creator function will be called to create a new Dataset object when the old one has a different session than the current active session.

Unlike StateCache, this class only caches the Dataset reference and doesn't cache the underlying RDD.

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Instance Constructors

  1. new DatasetRefCache(creator: () => Dataset[T])

    creator

    a function to create Dataset.

Value Members

  1. final def !=(arg0: Any): Boolean
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  9. def get: Dataset[T]
  10. final def getClass(): Class[_ <: AnyRef]
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