org.apache.spark.sql.streaming

Class StreamingQueryManager

Object

org.apache.spark.sql.streaming.StreamingQueryManager

All Implemented Interfaces:

Logging

public class StreamingQueryManager
extends Object
implements Logging

A class to manage all the StreamingQuery active in a SparkSession.

Since:

2.0.0

Method Summary

Modifier and Type	Method and Description
StreamingQuery[]	active() Returns a list of active queries associated with this SQLContext
void	addListener(StreamingQueryListener listener) Register a StreamingQueryListener to receive up-calls for life cycle events of StreamingQuery.
void	awaitAnyTermination() Wait until any of the queries on the associated SQLContext has terminated since the creation of the context, or since resetTerminated() was called.
boolean	awaitAnyTermination(long timeoutMs) Wait until any of the queries on the associated SQLContext has terminated since the creation of the context, or since resetTerminated() was called.
StreamingQuery	get(String id) Returns the query if there is an active query with the given id, or null.
StreamingQuery	get(java.util.UUID id) Returns the query if there is an active query with the given id, or null.
StreamingQueryListener[]	listListeners() List all StreamingQueryListeners attached to this StreamingQueryManager.
void	removeListener(StreamingQueryListener listener) Deregister a StreamingQueryListener.
void	resetTerminated() Forget about past terminated queries so that awaitAnyTermination() can be used again to wait for new terminations.

Methods inherited from class Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.spark.internal.Logging

initializeForcefully, initializeLogging, initializeLogIfNecessary, initializeLogIfNecessary, isTraceEnabled, log, logDebug, logDebug, logError, logError, logInfo, logInfo, logName, logTrace, logTrace, logWarning, logWarning

Method Detail

active

public StreamingQuery[] active()

Returns a list of active queries associated with this SQLContext

Returns:

(undocumented)

Since:

2.0.0

addListener

public void addListener(StreamingQueryListener listener)

Register a StreamingQueryListener to receive up-calls for life cycle events of StreamingQuery.

Parameters:

listener - (undocumented)

Since:

2.0.0

awaitAnyTermination

public void awaitAnyTermination()
                         throws StreamingQueryException

Wait until any of the queries on the associated SQLContext has terminated since the creation of the context, or since resetTerminated() was called. If any query was terminated with an exception, then the exception will be thrown.

If a query has terminated, then subsequent calls to awaitAnyTermination() will either return immediately (if the query was terminated by query.stop()), or throw the exception immediately (if the query was terminated with exception). Use resetTerminated() to clear past terminations and wait for new terminations.

In the case where multiple queries have terminated since resetTermination() was called, if any query has terminated with exception, then awaitAnyTermination() will throw any of the exception. For correctly documenting exceptions across multiple queries, users need to stop all of them after any of them terminates with exception, and then check the query.exception() for each query.

Throws:

StreamingQueryException - if any query has terminated with an exception

Since:

2.0.0

awaitAnyTermination

public boolean awaitAnyTermination(long timeoutMs)
                            throws StreamingQueryException

Wait until any of the queries on the associated SQLContext has terminated since the creation of the context, or since resetTerminated() was called. Returns whether any query has terminated or not (multiple may have terminated). If any query has terminated with an exception, then the exception will be thrown.

If a query has terminated, then subsequent calls to awaitAnyTermination() will either return true immediately (if the query was terminated by query.stop()), or throw the exception immediately (if the query was terminated with exception). Use resetTerminated() to clear past terminations and wait for new terminations.

In the case where multiple queries have terminated since resetTermination() was called, if any query has terminated with exception, then awaitAnyTermination() will throw any of the exception. For correctly documenting exceptions across multiple queries, users need to stop all of them after any of them terminates with exception, and then check the query.exception() for each query.

Parameters:

timeoutMs - (undocumented)

Returns:

(undocumented)

Throws:

StreamingQueryException - if any query has terminated with an exception

Since:

2.0.0

get

public StreamingQuery get(java.util.UUID id)

Returns the query if there is an active query with the given id, or null.

Parameters:

id - (undocumented)

Returns:

(undocumented)

Since:

2.1.0

get

public StreamingQuery get(String id)

Returns the query if there is an active query with the given id, or null.

Parameters:

id - (undocumented)

Returns:

(undocumented)

Since:

2.1.0

listListeners

public StreamingQueryListener[] listListeners()

List all StreamingQueryListeners attached to this StreamingQueryManager.

Returns:

(undocumented)

Since:

3.0.0

removeListener

public void removeListener(StreamingQueryListener listener)

Deregister a StreamingQueryListener.

Parameters:

listener - (undocumented)

Since:

2.0.0

resetTerminated

public void resetTerminated()

Forget about past terminated queries so that awaitAnyTermination() can be used again to wait for new terminations.

Since:

2.0.0