Github user jose-torres commented on a diff in the pull request: https://github.com/apache/spark/pull/20096#discussion_r159795735 --- Diff: external/kafka-0-10-sql/src/main/scala/ContinuousKafkaReader.scala --- @@ -0,0 +1,246 @@ +/* + * 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.kafka010 + +import java.io._ +import java.nio.charset.StandardCharsets +import java.util.concurrent.atomic.AtomicBoolean + +import org.apache.commons.io.IOUtils +import org.apache.kafka.clients.consumer.ConsumerRecord +import org.apache.kafka.common.TopicPartition +import org.apache.kafka.common.errors.WakeupException + +import org.apache.spark.internal.Logging +import org.apache.spark.sql.{DataFrame, Row, SparkSession, SQLContext} +import org.apache.spark.sql.catalyst.expressions.{Attribute, Cast, Literal, UnsafeProjection, UnsafeRow} +import org.apache.spark.sql.catalyst.expressions.codegen.{BufferHolder, UnsafeRowWriter} +import org.apache.spark.sql.catalyst.util.DateTimeUtils +import org.apache.spark.sql.execution.streaming.{HDFSMetadataLog, SerializedOffset} +import org.apache.spark.sql.kafka010.KafkaSource.{INSTRUCTION_FOR_FAIL_ON_DATA_LOSS_FALSE, INSTRUCTION_FOR_FAIL_ON_DATA_LOSS_TRUE, VERSION} +import org.apache.spark.sql.sources.v2.reader._ +import org.apache.spark.sql.sources.v2.streaming.reader.{ContinuousDataReader, ContinuousReader, Offset, PartitionOffset} +import org.apache.spark.sql.types.StructType +import org.apache.spark.unsafe.types.UTF8String + +class ContinuousKafkaReader( + kafkaReader: KafkaOffsetReader, + executorKafkaParams: java.util.Map[String, Object], + sourceOptions: Map[String, String], + metadataPath: String, + initialOffsets: KafkaOffsetRangeLimit, + failOnDataLoss: Boolean) + extends ContinuousReader with SupportsScanUnsafeRow with Logging { + + override def mergeOffsets(offsets: Array[PartitionOffset]): Offset = { + val mergedMap = offsets.map { + case KafkaSourcePartitionOffset(p, o) => Map(p -> o) + }.reduce(_ ++ _) + KafkaSourceOffset(mergedMap) + } + + private lazy val session = SparkSession.getActiveSession.get + private lazy val sc = session.sparkContext + + private lazy val pollTimeoutMs = sourceOptions.getOrElse( + "kafkaConsumer.pollTimeoutMs", + sc.conf.getTimeAsMs("spark.network.timeout", "120s").toString + ).toLong + + private val maxOffsetsPerTrigger = + sourceOptions.get("maxOffsetsPerTrigger").map(_.toLong) + + /** + * Lazily initialize `initialPartitionOffsets` to make sure that `KafkaConsumer.poll` is only + * called in StreamExecutionThread. Otherwise, interrupting a thread while running + * `KafkaConsumer.poll` may hang forever (KAFKA-1894). + */ + private lazy val initialPartitionOffsets = { --- End diff -- oops, no
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