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MicroBatchReadSupport.java
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MicroBatchReadSupport.java
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/*
* 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.sources.v2;
import java.util.Optional;
import org.apache.spark.annotation.InterfaceStability;
import org.apache.spark.sql.sources.v2.reader.streaming.MicroBatchReader;
import org.apache.spark.sql.types.StructType;
/**
* A mix-in interface for {@link DataSourceV2}. Data sources can implement this interface to
* provide streaming micro-batch data reading ability.
*/
@InterfaceStability.Evolving
public interface MicroBatchReadSupport extends DataSourceV2 {
/**
* Creates a {@link MicroBatchReader} to read batches of data from this data source in a
* streaming query.
*
* The execution engine will create a micro-batch reader at the start of a streaming query,
* alternate calls to setOffsetRange and planInputPartitions for each batch to process, and
* then call stop() when the execution is complete. Note that a single query may have multiple
* executions due to restart or failure recovery.
*
* @param schema the user provided schema, or empty() if none was provided
* @param checkpointLocation a path to Hadoop FS scratch space that can be used for failure
* recovery. Readers for the same logical source in the same query
* will be given the same checkpointLocation.
* @param options the options for the returned data source reader, which is an immutable
* case-insensitive string-to-string map.
*/
MicroBatchReader createMicroBatchReader(
Optional<StructType> schema,
String checkpointLocation,
DataSourceOptions options);
}