spark SupportsTriggerAvailableNow 源码
spark SupportsTriggerAvailableNow 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/streaming/SupportsTriggerAvailableNow.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.connector.read.streaming;
import org.apache.spark.annotation.Evolving;
/**
* An interface for streaming sources that supports running in Trigger.AvailableNow mode, which
* will process all the available data at the beginning of the query in (possibly) multiple batches.
*
* This mode will have better scalability comparing to Trigger.Once mode.
*
* @since 3.3.0
*/
@Evolving
public interface SupportsTriggerAvailableNow extends SupportsAdmissionControl {
/**
* This will be called at the beginning of streaming queries with Trigger.AvailableNow, to let the
* source record the offset for the current latest data at the time (a.k.a the target offset for
* the query). The source will behave as if there is no new data coming in after the target
* offset, i.e., the source will not return an offset higher than the target offset when
* {@link #latestOffset(Offset, ReadLimit) latestOffset} is called.
*/
void prepareForTriggerAvailableNow();
}
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