Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16686#discussion_r97664854
--- Diff:
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaRelation.scala
---
@@ -0,0 +1,107 @@
+/*
+ * 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.{util => ju}
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.rdd.RDD
+import org.apache.spark.sql.{Row, SQLContext}
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.util.DateTimeUtils
+import org.apache.spark.sql.sources.{BaseRelation, TableScan}
+import org.apache.spark.sql.types.StructType
+import org.apache.spark.unsafe.types.UTF8String
+
+
+private[kafka010] class KafkaRelation(
+ override val sqlContext: SQLContext,
+ kafkaReader: KafkaOffsetReader,
+ executorKafkaParams: ju.Map[String, Object],
+ sourceOptions: Map[String, String],
+ failOnDataLoss: Boolean,
+ startingOffsets: KafkaOffsets,
+ endingOffsets: KafkaOffsets)
+ extends BaseRelation with TableScan with Logging {
+
+ require(startingOffsets != LatestOffsets,
+ "Starting offset not allowed to be set to latest offsets.")
+ require(endingOffsets != EarliestOffsets,
+ "Ending offset not allowed to be set to earliest offsets.")
+
+ private val pollTimeoutMs = sourceOptions.getOrElse(
+ "kafkaConsumer.pollTimeoutMs",
+ sqlContext.sparkContext.conf.getTimeAsMs("spark.network.timeout",
"120s").toString
+ ).toLong
+
+ override def schema: StructType = KafkaOffsetReader.kafkaSchema
+
+ override def buildScan(): RDD[Row] = {
+ // Leverage the KafkaReader to obtain the relevant partition offsets
+ val fromPartitionOffsets = getPartitionOffsets(startingOffsets)
+ val untilPartitionOffsets = getPartitionOffsets(endingOffsets)
+ // Obtain topicPartitions in both from and until partition offset,
ignoring
+ // topic partitions that were added and/or deleted between the two
above calls.
+ val topicPartitions =
fromPartitionOffsets.keySet.intersect(untilPartitionOffsets.keySet)
+
+
+ val sortedExecutors =
KafkaUtils.getSortedExecutorList(sqlContext.sparkContext)
+ val numExecutors = sortedExecutors.length
+ logDebug("Sorted executors: " + sortedExecutors.mkString(", "))
+
+ // Calculate offset ranges
+ val offsetRanges = topicPartitions.map { tp =>
+ val fromOffset = fromPartitionOffsets.get(tp).getOrElse {
+ // This should not happen since topicPartitions contains all
partitions not in
+ // fromPartitionOffsets
+ throw new IllegalStateException(s"$tp doesn't have a from
offset")
+ }
+ val untilOffset = untilPartitionOffsets(tp)
+ val preferredLoc = if (numExecutors > 0) {
+ // This allows cached KafkaConsumers in the executors to be
re-used to read the same
+ // partition in every batch.
+ Some(sortedExecutors(KafkaUtils.floorMod(tp.hashCode,
numExecutors)))
--- End diff --
You don't need to set the preferred locations after changing to not use the
cached consumers.
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