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trait ReadStateStore extends AnyRef

Base trait for a versioned key-value store which provides read operations. Each instance of a ReadStateStore represents a specific version of state data, and such instances are created through a StateStoreProvider.

abort method will be called when the task is completed - please clean up the resources in the method.

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AnyRef, Any
Known Subclasses
StateStore, WrappedReadStateStore
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Abstract Value Members

  1. abstract def abort(): Unit

    Clean up the resource.

    Clean up the resource.

    The method name is to respect backward compatibility on StateStore.

  2. abstract def get(key: UnsafeRow): UnsafeRow

    Get the current value of a non-null key.

    Get the current value of a non-null key.

    returns

    a non-null row if the key exists in the store, otherwise null.

  3. abstract def id: StateStoreId

    Unique identifier of the store

  4. abstract def iterator(): Iterator[UnsafeRowPair]

    Return an iterator containing all the key-value pairs in the StateStore.

  5. abstract def version: Long

    Version of the data in this store before committing updates.

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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  6. final def eq(arg0: AnyRef): Boolean
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  7. def equals(arg0: Any): Boolean
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  8. def finalize(): Unit
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  9. final def getClass(): Class[_]
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  10. def getRange(start: Option[UnsafeRow], end: Option[UnsafeRow]): Iterator[UnsafeRowPair]

    Get key value pairs with optional approximate start and end extents.

    Get key value pairs with optional approximate start and end extents. If the State Store implementation maintains indices for the data based on the optional keyIndexOrdinal over fields keySchema (see StateStoreProvider.init()), then it can use start and end to make a best-effort scan over the data. Default implementation returns the full data scan iterator, which is correct but inefficient. Custom implementations must ensure that updates (puts, removes) can be made while iterating over this iterator.

    start

    UnsafeRow having the keyIndexOrdinal column set with appropriate starting value.

    end

    UnsafeRow having the keyIndexOrdinal column set with appropriate ending value.

    returns

    An iterator of key-value pairs that is guaranteed not miss any key between start and end, both inclusive.

  11. def hashCode(): Int
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  12. final def isInstanceOf[T0]: Boolean
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  15. final def notifyAll(): Unit
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  16. final def synchronized[T0](arg0: ⇒ T0): T0
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  17. def toString(): String
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  18. final def wait(): Unit
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  19. final def wait(arg0: Long, arg1: Int): Unit
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  20. final def wait(arg0: Long): Unit
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