` _corrupt_record: string (nullable = true)` with a simple Spark Scala application [closed] - scala

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I am trying to run a simple/dumb Spark Scala application example in Spark: The Definitive Guide. It reads a json file and do some work on it. But running it reports _corrupt_record: string (nullable = true). The json file has a JSON object per line. I was wondering what is wrong? Thanks.
Scala code:
package com.databricks.example
import org.apache.log4j.Logger
import org.apache.spark.sql.SparkSession
object DFUtils extends Serializable {
#transient lazy val logger = Logger.getLogger(getClass.getName)
def pointlessUDF(raw: String) = {
raw
}
}
object DataFrameExample extends Serializable {
def main(args: Array[String]): Unit = {
val pathToDataFolder = args(0)
val spark = SparkSession.builder().appName("Spark Example")
.config("spark.sql.warehouse.dir", "/user/hive/warehouse")
.getOrCreate()
// udf registration
spark.udf.register("myUDF", DFUtils.pointlessUDF(_:String):String)
val df = spark.read.json(pathToDataFolder + "data.json")
df.printSchema()
// df.collect.foreach(println)
// val x = df.select("value").foreach(x => println(x));
// val manipulated = df.groupBy("grouping").sum().collect().foreach(x => println(x))
// val manipulated = df.groupBy(expr("myUDF(group)")).sum().collect().foreach(x => println(x))
}
}
/tmp/test/data.json is
{"grouping":"group_1", value:5}
{"grouping":"group_1", value:6}
{"grouping":"group_3", value:7}
{"grouping":"group_2", value:3}
{"grouping":"group_4", value:2}
{"grouping":"group_1", value:1}
{"grouping":"group_2", value:2}
{"grouping":"group_3", value:3}
build.sbt is
$ cat build.sbt
name := "example"
organization := "com.databricks"
version := "0.1-SNAPSHOT"
scalaVersion := "2.11.8"
// scalaVersion := "2.13.1"
// Spark Information
// val sparkVersion = "2.2.0"
val sparkVersion = "2.4.5"
// allows us to include spark packages
resolvers += "bintray-spark-packages" at
"https://dl.bintray.com/spark-packages/maven/"
resolvers += "Typesafe Simple Repository" at
"http://repo.typesafe.com/typesafe/simple/maven-releases/"
resolvers += "MavenRepository" at
"https://mvnrepository.com/"
libraryDependencies ++= Seq(
// spark core
"org.apache.spark" %% "spark-core" % sparkVersion,
"org.apache.spark" %% "spark-sql" % sparkVersion,
)
Build and package with SBT:
$ sbt package
[info] Loading project definition from /tmp/test/bookexample/project
[info] Loading settings for project bookexample from build.sbt ...
[info] Set current project to example (in build file:/tmp/test/bookexample/)
[warn] insecure HTTP request is deprecated 'http://repo.typesafe.com/typesafe/simple/maven-releases/'; switch to HTTPS or opt-in as ("Typesafe Simple Repository" at "http://repo.typesafe.com/typesafe/simple/maven-releases/").withAllowInsecureProtocol(true)
[warn] insecure HTTP request is deprecated 'http://repo.typesafe.com/typesafe/simple/maven-releases/'; switch to HTTPS or opt-in as ("Typesafe Simple Repository" at "http://repo.typesafe.com/typesafe/simple/maven-releases/").withAllowInsecureProtocol(true)
[warn] insecure HTTP request is deprecated 'http://repo.typesafe.com/typesafe/simple/maven-releases/'; switch to HTTPS or opt-in as ("Typesafe Simple Repository" at "http://repo.typesafe.com/typesafe/simple/maven-releases/").withAllowInsecureProtocol(true)
[info] Compiling 1 Scala source to /tmp/test/bookexample/target/scala-2.11/classes ...
[success] Total time: 28 s, completed Mar 19, 2020, 8:35:50 AM
Run with spark-submit:
$ ~/programs/spark/spark-2.4.5-bin-hadoop2.7/bin/spark-submit --class com.databricks.example.DataFrameExample --master local target/scala-2.11/example_2.11-0.1-SNAPSHOT.jar /tmp/test/
20/03/19 08:37:58 WARN Utils: Your hostname, ocean resolves to a loopback address: 127.0.1.1; using 192.168.122.1 instead (on interface virbr0)
20/03/19 08:37:58 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to another address
20/03/19 08:37:59 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
20/03/19 08:38:00 INFO SparkContext: Running Spark version 2.4.5
20/03/19 08:38:00 INFO SparkContext: Submitted application: Spark Example
20/03/19 08:38:00 INFO SecurityManager: Changing view acls to: t
20/03/19 08:38:00 INFO SecurityManager: Changing modify acls to: t
20/03/19 08:38:00 INFO SecurityManager: Changing view acls groups to:
20/03/19 08:38:00 INFO SecurityManager: Changing modify acls groups to:
20/03/19 08:38:00 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(t); groups with view permissions: Set(); users with modify permissions: Set(t); groups with modify permissions: Set()
20/03/19 08:38:01 INFO Utils: Successfully started service 'sparkDriver' on port 46163.
20/03/19 08:38:01 INFO SparkEnv: Registering MapOutputTracker
20/03/19 08:38:01 INFO SparkEnv: Registering BlockManagerMaster
20/03/19 08:38:01 INFO BlockManagerMasterEndpoint: Using org.apache.spark.storage.DefaultTopologyMapper for getting topology information
20/03/19 08:38:01 INFO BlockManagerMasterEndpoint: BlockManagerMasterEndpoint up
20/03/19 08:38:01 INFO DiskBlockManager: Created local directory at /tmp/blockmgr-42f9b92d-1420-4e04-aaf6-acb635a27907
20/03/19 08:38:01 INFO MemoryStore: MemoryStore started with capacity 366.3 MB
20/03/19 08:38:02 INFO SparkEnv: Registering OutputCommitCoordinator
20/03/19 08:38:02 INFO Utils: Successfully started service 'SparkUI' on port 4040.
20/03/19 08:38:02 INFO SparkUI: Bound SparkUI to 0.0.0.0, and started at http://192.168.122.1:4040
20/03/19 08:38:02 INFO SparkContext: Added JAR file:/tmp/test/bookexample/target/scala-2.11/example_2.11-0.1-SNAPSHOT.jar at spark://192.168.122.1:46163/jars/example_2.11-0.1-SNAPSHOT.jar with timestamp 1584621482787
20/03/19 08:38:03 INFO Executor: Starting executor ID driver on host localhost
20/03/19 08:38:03 INFO Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 35287.
20/03/19 08:38:03 INFO NettyBlockTransferService: Server created on 192.168.122.1:35287
20/03/19 08:38:03 INFO BlockManager: Using org.apache.spark.storage.RandomBlockReplicationPolicy for block replication policy
20/03/19 08:38:03 INFO BlockManagerMaster: Registering BlockManager BlockManagerId(driver, 192.168.122.1, 35287, None)
20/03/19 08:38:03 INFO BlockManagerMasterEndpoint: Registering block manager 192.168.122.1:35287 with 366.3 MB RAM, BlockManagerId(driver, 192.168.122.1, 35287, None)
20/03/19 08:38:03 INFO BlockManagerMaster: Registered BlockManager BlockManagerId(driver, 192.168.122.1, 35287, None)
20/03/19 08:38:03 INFO BlockManager: Initialized BlockManager: BlockManagerId(driver, 192.168.122.1, 35287, None)
20/03/19 08:38:04 INFO SharedState: Setting hive.metastore.warehouse.dir ('null') to the value of spark.sql.warehouse.dir ('/user/hive/warehouse').
20/03/19 08:38:04 INFO SharedState: Warehouse path is '/user/hive/warehouse'.
20/03/19 08:38:05 INFO StateStoreCoordinatorRef: Registered StateStoreCoordinator endpoint
20/03/19 08:38:10 INFO InMemoryFileIndex: It took 97 ms to list leaf files for 1 paths.
20/03/19 08:38:10 INFO InMemoryFileIndex: It took 3 ms to list leaf files for 1 paths.
20/03/19 08:38:12 INFO FileSourceStrategy: Pruning directories with:
20/03/19 08:38:12 INFO FileSourceStrategy: Post-Scan Filters:
20/03/19 08:38:12 INFO FileSourceStrategy: Output Data Schema: struct<value: string>
20/03/19 08:38:12 INFO FileSourceScanExec: Pushed Filters:
20/03/19 08:38:14 INFO CodeGenerator: Code generated in 691.376591 ms
20/03/19 08:38:14 INFO MemoryStore: Block broadcast_0 stored as values in memory (estimated size 285.2 KB, free 366.0 MB)
20/03/19 08:38:14 INFO MemoryStore: Block broadcast_0_piece0 stored as bytes in memory (estimated size 23.3 KB, free 366.0 MB)
20/03/19 08:38:14 INFO BlockManagerInfo: Added broadcast_0_piece0 in memory on 192.168.122.1:35287 (size: 23.3 KB, free: 366.3 MB)
20/03/19 08:38:14 INFO SparkContext: Created broadcast 0 from json at DataFrameExample.scala:31
20/03/19 08:38:14 INFO FileSourceScanExec: Planning scan with bin packing, max size: 4194560 bytes, open cost is considered as scanning 4194304 bytes.
20/03/19 08:38:14 INFO SparkContext: Starting job: json at DataFrameExample.scala:31
20/03/19 08:38:14 INFO DAGScheduler: Got job 0 (json at DataFrameExample.scala:31) with 1 output partitions
20/03/19 08:38:14 INFO DAGScheduler: Final stage: ResultStage 0 (json at DataFrameExample.scala:31)
20/03/19 08:38:14 INFO DAGScheduler: Parents of final stage: List()
20/03/19 08:38:14 INFO DAGScheduler: Missing parents: List()
20/03/19 08:38:15 INFO DAGScheduler: Submitting ResultStage 0 (MapPartitionsRDD[3] at json at DataFrameExample.scala:31), which has no missing parents
20/03/19 08:38:15 INFO MemoryStore: Block broadcast_1 stored as values in memory (estimated size 12.3 KB, free 366.0 MB)
20/03/19 08:38:15 INFO MemoryStore: Block broadcast_1_piece0 stored as bytes in memory (estimated size 7.4 KB, free 366.0 MB)
20/03/19 08:38:15 INFO BlockManagerInfo: Added broadcast_1_piece0 in memory on 192.168.122.1:35287 (size: 7.4 KB, free: 366.3 MB)
20/03/19 08:38:15 INFO SparkContext: Created broadcast 1 from broadcast at DAGScheduler.scala:1163
20/03/19 08:38:15 INFO DAGScheduler: Submitting 1 missing tasks from ResultStage 0 (MapPartitionsRDD[3] at json at DataFrameExample.scala:31) (first 15 tasks are for partitions Vector(0))
20/03/19 08:38:15 INFO TaskSchedulerImpl: Adding task set 0.0 with 1 tasks
20/03/19 08:38:15 INFO TaskSetManager: Starting task 0.0 in stage 0.0 (TID 0, localhost, executor driver, partition 0, PROCESS_LOCAL, 8242 bytes)
20/03/19 08:38:15 INFO Executor: Running task 0.0 in stage 0.0 (TID 0)
20/03/19 08:38:15 INFO Executor: Fetching spark://192.168.122.1:46163/jars/example_2.11-0.1-SNAPSHOT.jar with timestamp 1584621482787
20/03/19 08:38:15 INFO TransportClientFactory: Successfully created connection to /192.168.122.1:46163 after 145 ms (0 ms spent in bootstraps)
20/03/19 08:38:15 INFO Utils: Fetching spark://192.168.122.1:46163/jars/example_2.11-0.1-SNAPSHOT.jar to /tmp/spark-983f7f15-6df2-4fec-90b0-2534f4b91764/userFiles-4bb98e5a-d49a-4e2f-9553-4e0982f41f0e/fetchFileTemp5270349024712252124.tmp
20/03/19 08:38:16 INFO Executor: Adding file:/tmp/spark-983f7f15-6df2-4fec-90b0-2534f4b91764/userFiles-4bb98e5a-d49a-4e2f-9553-4e0982f41f0e/example_2.11-0.1-SNAPSHOT.jar to class loader
20/03/19 08:38:16 INFO FileScanRDD: Reading File path: file:///tmp/test/data.json, range: 0-256, partition values: [empty row]
20/03/19 08:38:16 INFO CodeGenerator: Code generated in 88.903645 ms
20/03/19 08:38:16 INFO Executor: Finished task 0.0 in stage 0.0 (TID 0). 1893 bytes result sent to driver
20/03/19 08:38:16 INFO TaskSetManager: Finished task 0.0 in stage 0.0 (TID 0) in 1198 ms on localhost (executor driver) (1/1)
20/03/19 08:38:16 INFO TaskSchedulerImpl: Removed TaskSet 0.0, whose tasks have all completed, from pool
20/03/19 08:38:16 INFO DAGScheduler: ResultStage 0 (json at DataFrameExample.scala:31) finished in 1.639 s
20/03/19 08:38:16 INFO DAGScheduler: Job 0 finished: json at DataFrameExample.scala:31, took 1.893394 s
root
|-- _corrupt_record: string (nullable = true)
20/03/19 08:38:16 INFO SparkContext: Invoking stop() from shutdown hook
20/03/19 08:38:16 INFO SparkUI: Stopped Spark web UI at http://192.168.122.1:4040
20/03/19 08:38:16 INFO MapOutputTrackerMasterEndpoint: MapOutputTrackerMasterEndpoint stopped!
20/03/19 08:38:17 INFO MemoryStore: MemoryStore cleared
20/03/19 08:38:17 INFO BlockManager: BlockManager stopped
20/03/19 08:38:17 INFO BlockManagerMaster: BlockManagerMaster stopped
20/03/19 08:38:17 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped!
20/03/19 08:38:17 INFO SparkContext: Successfully stopped SparkContext
20/03/19 08:38:17 INFO ShutdownHookManager: Shutdown hook called
20/03/19 08:38:17 INFO ShutdownHookManager: Deleting directory /tmp/spark-983f7f15-6df2-4fec-90b0-2534f4b91764
20/03/19 08:38:17 INFO ShutdownHookManager: Deleting directory /tmp/spark-7d1fcc2e-af36-4dc4-ab6b-49b901e890ba
The original code from the book is
object DataFrameExample extends Serializable {
def main(args: Array[String]) = {
val pathToDataFolder = args(0)
// start up the SparkSession
// along with explicitly setting a given config
val spark = SparkSession.builder().appName("Spark Example")
.config("spark.sql.warehouse.dir", "/user/hive/warehouse")
.getOrCreate()
// udf registration
spark.udf.register("myUDF", someUDF(_:String):String)
val df = spark.read.json(pathToDataFolder + "data.json")
val manipulated = df.groupBy(expr("myUDF(group)")).sum().collect()
.foreach(x => println(x))
}
}

Answer 1

There is no issue with Code. The issue is with your data. It is not in json format. if you will check double quote(") is missing around column value in your data so it is giving _corrupt_record: string
Chang data as below and run the same code:
{"grouping":"group_1", "value":5}
{"grouping":"group_1", "value":6}
{"grouping":"group_3", "value":7}
{"grouping":"group_2", "value":3}
{"grouping":"group_4", "value":2}
{"grouping":"group_1", "value":1}
{"grouping":"group_2", "value":2}
{"grouping":"group_3", "value":3}
df = spark.read.json("/spath/files/1.json")
df.show()
+--------+-----+
|grouping|value|
+--------+-----+
| group_1| 5|
| group_1| 6|
| group_3| 7|
| group_2| 3|
| group_4| 2|
| group_1| 1|
| group_2| 2|
| group_3| 3|
+--------+-----+

Answer 2

As pointed out by others in this thread the problem is that your input is not a valid JSON. However libraries used by Spark, and by extensions Spark itself, supports such cases:
val df = spark
.read
.option("allowUnquotedFieldNames", "true")
.json(pathToDataFolder + "data.json")