Github user brkyvz commented on a diff in the pull request: https://github.com/apache/spark/pull/19925#discussion_r155834182 --- Diff: sql/core/src/main/java/org/apache/spark/sql/sources/v2/MicroBatchWriteSupport.java --- @@ -0,0 +1,58 @@ +/* + * 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.execution.streaming.BaseStreamingSink; +import org.apache.spark.sql.sources.v2.writer.DataSourceV2Writer; +import org.apache.spark.sql.streaming.OutputMode; +import org.apache.spark.sql.types.StructType; + +/** + * A mix-in interface for {@link DataSourceV2}. Data sources can implement this interface to + * provide data writing ability and save the data from a microbatch to the data source. + */ +@InterfaceStability.Evolving +public interface MicroBatchWriteSupport extends BaseStreamingSink { + + /** + * Creates an optional {@link DataSourceV2Writer} to save the data to this data source. Data + * sources can return None if there is no writing needed to be done. + * + * @param queryId A unique string for the writing query. It's possible that there are many writing + * queries running at the same time, and the returned {@link DataSourceV2Writer} + * can use this id to distinguish itself from others. + * @param epochId The uniquenumeric ID of the batch within this writing query. This is an + * incrementing counter representing a consistent set of data; the same batch may + * be started multiple times in failure recovery scenarios, but it will always + * contain the same records. + * @param schema the schema of the data to be written. + * @param mode the output mode which determines what successive batch output means to this + * source, please refer to {@link OutputMode} for more details. --- End diff -- to this **sink**? not source
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