spark ConsoleStreamingWrite 源码
spark ConsoleStreamingWrite 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/sources/ConsoleStreamingWrite.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.
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package org.apache.spark.sql.execution.streaming.sources
import org.apache.spark.internal.Logging
import org.apache.spark.sql.{Dataset, SparkSession}
import org.apache.spark.sql.catalyst.plans.logical.LocalRelation
import org.apache.spark.sql.connector.write.{PhysicalWriteInfo, WriterCommitMessage}
import org.apache.spark.sql.connector.write.streaming.{StreamingDataWriterFactory, StreamingWrite}
import org.apache.spark.sql.types.StructType
import org.apache.spark.sql.util.CaseInsensitiveStringMap
/** Common methods used to create writes for the console sink */
class ConsoleWrite(schema: StructType, options: CaseInsensitiveStringMap)
extends StreamingWrite with Logging {
// Number of rows to display, by default 20 rows
protected val numRowsToShow = options.getInt("numRows", 20)
// Truncate the displayed data if it is too long, by default it is true
protected val isTruncated = options.getBoolean("truncate", true)
assert(SparkSession.getActiveSession.isDefined)
protected val spark = SparkSession.getActiveSession.get
def createStreamingWriterFactory(info: PhysicalWriteInfo): StreamingDataWriterFactory =
PackedRowWriterFactory
override def commit(epochId: Long, messages: Array[WriterCommitMessage]): Unit = {
// We have to print a "Batch" label for the epoch for compatibility with the pre-data source V2
// behavior.
printRows(messages, schema, s"Batch: $epochId")
}
def abort(epochId: Long, messages: Array[WriterCommitMessage]): Unit = {}
protected def printRows(
commitMessages: Array[WriterCommitMessage],
schema: StructType,
printMessage: String): Unit = {
val rows = commitMessages.collect {
case PackedRowCommitMessage(rs) => rs
}.flatten
// scalastyle:off println
println("-------------------------------------------")
println(printMessage)
println("-------------------------------------------")
// scalastyle:off println
Dataset.ofRows(spark, LocalRelation(schema.toAttributes, rows))
.show(numRowsToShow, isTruncated)
}
override def toString(): String = {
s"ConsoleWriter[numRows=$numRowsToShow, truncate=$isTruncated]"
}
}
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