state

trait StateStore extends AnyRef

Base trait for a versioned key-value store used for streaming aggregations
class StateStoreCoordinatorRef extends AnyRef

Reference to a StateStoreCoordinator that can be used to coordinate instances of StateStores across all the executors, and get their locations for job scheduling.
case class StateStoreId(checkpointLocation: String, operatorId: Long, partitionId: Int) extends Product with Serializable

Unique identifier for a StateStore
implicit class StateStoreOps[T] extends AnyRef
trait StateStoreProvider extends AnyRef

Trait representing a provider of a specific version of a StateStore.
class StateStoreRDD[T, U] extends RDD[U]

An RDD that allows computations to be executed against StateStores.
An RDD that allows computations to be executed against StateStores. It uses the StateStoreCoordinator to get the locations of loaded state stores and use that as the preferred locations.
sealed trait StoreUpdate extends AnyRef

Trait representing updates made to a StateStore.
case class ValueAdded(key: UnsafeRow, value: UnsafeRow) extends StoreUpdate with Product with Serializable
case class ValueRemoved(key: UnsafeRow, value: UnsafeRow) extends StoreUpdate with Product with Serializable
case class ValueUpdated(key: UnsafeRow, value: UnsafeRow) extends StoreUpdate with Product with Serializable

object StateStore extends Logging

Companion object to StateStore that provides helper methods to create and retrieve stores by their unique ids.
Companion object to StateStore that provides helper methods to create and retrieve stores by their unique ids. In addition, when a SparkContext is active (i.e. SparkEnv.get is not null), it also runs a periodic background task to do maintenance on the loaded stores. For each store, it uses the StateStoreCoordinator to ensure whether the current loaded instance of the store is the active instance. Accordingly, it either keeps it loaded and performs maintenance, or unloads the store.
object StateStoreCoordinatorRef extends Logging

Helper object used to create reference to StateStoreCoordinator.