spark Sink 源码
spark Sink 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/Sink.scala
/*
* 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.execution.streaming
import java.util
import org.apache.spark.sql.DataFrame
import org.apache.spark.sql.connector.catalog.{Table, TableCapability}
import org.apache.spark.sql.types.StructType
/**
* An interface for systems that can collect the results of a streaming query. In order to preserve
* exactly once semantics a sink must be idempotent in the face of multiple attempts to add the same
* batch.
*
* Note that, we extends `Table` here, to make the v1 streaming sink API be compatible with
* data source v2.
*/
trait Sink extends Table {
/**
* Adds a batch of data to this sink. The data for a given `batchId` is deterministic and if
* this method is called more than once with the same batchId (which will happen in the case of
* failures), then `data` should only be added once.
*
* Note 1: You cannot apply any operators on `data` except consuming it (e.g., `collect/foreach`).
* Otherwise, you may get a wrong result.
*
* Note 2: The method is supposed to be executed synchronously, i.e. the method should only return
* after data is consumed by sink successfully.
*/
def addBatch(batchId: Long, data: DataFrame): Unit
override def name: String = {
throw new IllegalStateException("should not be called.")
}
override def schema: StructType = {
throw new IllegalStateException("should not be called.")
}
override def capabilities: util.Set[TableCapability] = {
throw new IllegalStateException("should not be called.")
}
}
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