trait TTLState extends AnyRef
Represents the underlying state for secondary TTL Index for a user defined state variable.
This state allows Spark to query ttl values based on expiration time allowing efficient ttl cleanup.
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- abstract def clearExpiredState(): Long
Perform the user state clean up based on ttl values stored in this state.
Perform the user state clean up based on ttl values stored in this state. NOTE that its not safe to call this operation concurrently when the user can also modify the underlying State. Cleanup should be initiated after arbitrary state operations are completed by the user.
- returns
number of values cleaned up.
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(Since version 9)