:: DeveloperApi :: Identifies a particular Block of data, usually associated with a single file.
:: DeveloperApi :: This class represent an unique identifier for a BlockManager.
:: DeveloperApi :: Flags for controlling the storage of an RDD.
:: DeveloperApi :: Storage information for each BlockManager.
:: DeveloperApi :: A SparkListener that maintains executor storage status.
Various org.apache.spark.storage.StorageLevel defined and utility functions for creating new storage levels.