org.apache.spark.sql.execution.streaming.state
StreamingAggregationStateManager
Companion object StreamingAggregationStateManager
sealed trait StreamingAggregationStateManager extends Serializable
Base trait for state manager purposed to be used from streaming aggregations.
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- abstract def commit(store: StateStore): Long
Commit all the updates that have been made to the target state store, and return the new version.
- abstract def get(store: ReadStateStore, key: UnsafeRow): UnsafeRow
Get the current value of a non-null key from the target state store.
- abstract def getKey(row: UnsafeRow): UnsafeRow
Extract columns consisting key from input row, and return the new row for key columns.
- abstract def getStateValueSchema: StructType
Calculate schema for the value of state.
Calculate schema for the value of state. The schema is mainly passed to the StateStoreRDD.
- abstract def iterator(store: ReadStateStore): Iterator[UnsafeRowPair]
Return an iterator containing all the key-value pairs in target state store.
- abstract def keys(store: ReadStateStore): Iterator[UnsafeRow]
Return an iterator containing all the keys in target state store.
- abstract def put(store: StateStore, row: UnsafeRow): Unit
Put a new value for a non-null key to the target state store.
Put a new value for a non-null key to the target state store. Note that key will be extracted from the input row, and the key would be same as the result of getKey(inputRow).
- abstract def remove(store: StateStore, key: UnsafeRow): Unit
Remove a single non-null key from the target state store.
- abstract def values(store: ReadStateStore): Iterator[UnsafeRow]
Return an iterator containing all the values in target state store.
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