org.apache.spark.sql.util

ContinuousQueryListener

abstract class ContinuousQueryListener extends AnyRef

:: Experimental :: Interface for listening to events related to ContinuousQueries.

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@Experimental()
Note

The methods are not thread-safe as they may be called from different threads.

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Instance Constructors

  1. new ContinuousQueryListener()

Abstract Value Members

  1. abstract def onQueryProgress(queryProgress: QueryProgress): Unit

    Called when there is some status update (ingestion rate updated, etc.

    Called when there is some status update (ingestion rate updated, etc.)

    Note

    This method is asynchronous. The status in ContinuousQuery will always be latest no matter when this method is called. Therefore, the status of ContinuousQuery may be changed before/when you process the event. E.g., you may find ContinuousQuery is terminated when you are processing QueryProgress.

  2. abstract def onQueryStarted(queryStarted: QueryStarted): Unit

    Called when a query is started.

    Called when a query is started.

    Note

    This is called synchronously with DataFrameWriter.startStream(), that is, onQueryStart will be called on all listeners before DataFrameWriter.startStream() returns the corresponding ContinuousQuery. Please don't block this method as it will block your query.

  3. abstract def onQueryTerminated(queryTerminated: QueryTerminated): Unit

    Called when a query is stopped, with or without error

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