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From Chetan Khatri <chetan.opensou...@gmail.com>
Subject Kafka Topic to Parquet HDFS with Structured Streaming
Date Fri, 07 Jun 2019 21:59:20 GMT
Hello Dear Spark Users,

I am trying to write data from Kafka Topic to Parquet HDFS with Structured
Streaming but Getting failures. Please do help.

val spark: SparkSession =
SparkSession.builder().appName("DemoSparkKafka").getOrCreate()
import spark.implicits._
val dataFromTopicDF = spark
  .readStream
  .format("kafka")
  .option("kafka.bootstrap.servers", "localhost:9092")
  .option("subscribe", "test")
  .option("startingOffsets", "earliest")
  .load()
  .selectExpr("CAST(key AS STRING)", "CAST(value AS STRING)")

logger.info("DemoSparkKafka - Printing Topic Messages in Key - Value pairs.")
val topicQuery = dataFromTopicDF.writeStream
  .format("console")
  .option("truncate", false)
  .option("checkpointLocation", "/tmp/checkpoint")
  .trigger(Trigger.ProcessingTime(10.seconds))
  .start()

topicQuery.awaitTermination()
topicQuery.stop()


Above code is working well but when I am trying to write to Parquet at
HDFS getting exceptions.


logger.info("DemoSparkKafka - Writing Topic Messages to Parquet at HDFS")

val parquetQuery = dataFromTopicDF.writeStream
.format("parquet")
.option("startingOffsets", "earliest")
.option("checkpointLocation", "/tmp/checkpoint")
.option("path", "/sample-topic")
.start()

parquetQuery.awaitTermination()
parquetQuery.stop()


*Exception Details:*


Exception in thread "main" java.io.IOException: mkdir of
/sample-topic/_spark_metadata failed
	at org.apache.hadoop.fs.FileSystem.primitiveMkdir(FileSystem.java:1067)
	at org.apache.hadoop.fs.DelegateToFileSystem.mkdir(DelegateToFileSystem.java:176)
	at org.apache.hadoop.fs.FilterFs.mkdir(FilterFs.java:197)
	at org.apache.hadoop.fs.FileContext$4.next(FileContext.java:730)
	at org.apache.hadoop.fs.FileContext$4.next(FileContext.java:726)
	at org.apache.hadoop.fs.FSLinkResolver.resolve(FSLinkResolver.java:90)
	at org.apache.hadoop.fs.FileContext.mkdir(FileContext.java:733)
	at org.apache.spark.sql.execution.streaming.HDFSMetadataLog$FileContextManager.mkdirs(HDFSMetadataLog.scala:378)
	at org.apache.spark.sql.execution.streaming.HDFSMetadataLog.<init>(HDFSMetadataLog.scala:66)
	at org.apache.spark.sql.execution.streaming.CompactibleFileStreamLog.<init>(CompactibleFileStreamLog.scala:46)
	at org.apache.spark.sql.execution.streaming.FileStreamSinkLog.<init>(FileStreamSinkLog.scala:85)
	at org.apache.spark.sql.execution.streaming.FileStreamSink.<init>(FileStreamSink.scala:98)
	at org.apache.spark.sql.execution.datasources.DataSource.createSink(DataSource.scala:317)
	at org.apache.spark.sql.streaming.DataStreamWriter.start(DataStreamWriter.scala:293)
	at com.dynasty.poc.DemoSparkKafka$.delayedEndpoint$com$dynasty$poc$DemoSparkKafka$1(DemoSparkKafka.scala:35)
	at com.dynasty.poc.DemoSparkKafka$delayedInit$body.apply(DemoSparkKafka.scala:7)
	at scala.Function0$class.apply$mcV$sp(Function0.scala:34)
	at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
	at scala.App$$anonfun$main$1.apply(App.scala:76)
	at scala.App$$anonfun$main$1.apply(App.scala:76)
	at scala.collection.immutable.List.foreach(List.scala:381)
	at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
	at scala.App$class.main(App.scala:76)
	at com.dynasty.poc.DemoSparkKafka$.main(DemoSparkKafka.scala:7)
	at com.dynasty.poc.DemoSparkKafka.main(DemoSparkKafka.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:894)
	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:198)
	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:228)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:137)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)


Thanks

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