spark GroupStateTimeout 源码
spark GroupStateTimeout 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/streaming/GroupStateTimeout.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.sql.streaming;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.annotation.Experimental;
import org.apache.spark.sql.catalyst.plans.logical.*;
/**
* Represents the type of timeouts possible for the Dataset operations
* {@code mapGroupsWithState} and {@code flatMapGroupsWithState}.
* <p>
* See documentation on {@code GroupState} for more details.
*
* @since 2.2.0
*/
@Experimental
@Evolving
public class GroupStateTimeout {
// NOTE: if you're adding new type of timeout, you should also fix the places below:
// - Scala:
// org.apache.spark.sql.execution.streaming.GroupStateImpl.getGroupStateTimeoutFromString
// - Python: pyspark.sql.streaming.state.GroupStateTimeout
/**
* Timeout based on processing time.
* <p>
* The duration of timeout can be set for each group in
* {@code map/flatMapGroupsWithState} by calling {@code GroupState.setTimeoutDuration()}.
* <p>
* See documentation on {@code GroupState} for more details.
*/
public static GroupStateTimeout ProcessingTimeTimeout() {
return ProcessingTimeTimeout$.MODULE$;
}
/**
* Timeout based on event-time.
* <p>
* The event-time timestamp for timeout can be set for each
* group in {@code map/flatMapGroupsWithState} by calling
* {@code GroupState.setTimeoutTimestamp()}.
* In addition, you have to define the watermark in the query using
* {@code Dataset.withWatermark}.
* When the watermark advances beyond the set timestamp of a group and the group has not
* received any data, then the group times out.
* <p>
* See documentation on {@code GroupState} for more details.
*/
public static GroupStateTimeout EventTimeTimeout() { return EventTimeTimeout$.MODULE$; }
/** No timeout. */
public static GroupStateTimeout NoTimeout() { return NoTimeout$.MODULE$; }
}
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