六（1）、spark遇到的问题

1、意外退出spark-shell，而不是quit，然后再输入spark-shell命令的时候，报错：

19/04/11 13:42:32 WARN util.Utils: Service 'SparkUI' could not bind on port 4040. Attempting port 4041.

jps查看，SparkSubmit在，查看4040端口也是被SparkSubmit占用中。
解决方法：https://blog.csdn.net/wawa8899/article/details/81016029

spark-shell启动时会启动一个Spark 的Web UI。由于刚刚启动spark-shell的时候并没有指定appName，所以Web UI右上角显示Spark shell application UI（源码$SPARK_HOME/bin/spark-shell里面定义）。如果指定了AppName，则这里显示AppName。
Spark Web UI默认使用端口号4040，如果4040被占用，它会自动+1，即使用4041；若4041也被占用，依此类推

2、
for (elem <- rdd.collect()) {println(elem.getClass.getSimpleName);print(elem);println("---------")}
查询出来elem数据类型为String（其中rdd为MapPartitionsRDD）

scala> val list01=List(1,2,3,4)
list01: List[Int] = List(1, 2, 3, 4)
scala> val rdd1 = sc.parallelize(list01)
rdd1: org.apache.spark.rdd.RDD[Int] = ParallelCollectionRDD[7] at parallelize at :26
scala> rdd1.collect()
res2: Array[Int] = Array(1, 2, 3, 4)

如果不是放的list或者array，就会报错：

scala> sc.parallelize(set01).collect()
:27: error: type mismatch;
found : scala.collection.immutable.Set[Int]
required: Seq[?]
sc.parallelize(set01).collect()

3、在创建sparksession实例的时候：
val spark: SparkSession = SparkSession.builder().appName(“node01”).master(“master”).enableHiveSupport().getOrCreate()
报错：

Exception in thread "main" java.lang.IllegalArgumentException: Unable to instantiate SparkSession with Hive support because Hive classes are not found.

去掉enableHiveSupport()之后报错：

Exception in thread "main" org.apache.spark.SparkException: Could not parse Master URL: 'node01'

将master参数改为local之后，报错：

Exception in thread "main" org.apache.spark.SparkException: Only one SparkContext may be running in this JVM (see SPARK-2243). To ignore this error, set spark.driver.allowMultipleContexts = true. The currently running SparkContext was created at:
org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:901)
com.jenny.spark.SparkStreamingKafkaReceiver$.main(SparkStreamingKafkaReceiver.scala:17)
com.jenny.spark.SparkStreamingKafkaReceiver.main(SparkStreamingKafkaReceiver.scala)
	at org.apache.spark.SparkContext$$anonfun$assertNoOtherContextIsRunning$2.apply(SparkContext.scala:2472)
	at org.apache.spark.SparkContext$$anonfun$assertNoOtherContextIsRunning$2.apply(SparkContext.scala:2468)
	at scala.Option.foreach(Option.scala:257)
	at org.apache.spark.SparkContext$.assertNoOtherContextIsRunning(SparkContext.scala:2468)
	at org.apache.spark.SparkContext$.markPartiallyConstructed(SparkContext.scala:2557)
	at org.apache.spark.SparkContext.(SparkContext.scala:85)
	at com.jenny.spark.SparkStreamingKafkaReceiver$.main(SparkStreamingKafkaReceiver.scala:24)
	at com.jenny.spark.SparkStreamingKafkaReceiver.main(SparkStreamingKafkaReceiver.scala)
19/04/12 15:10:31 INFO spark.SparkContext: Invoking stop() from shutdown hook
19/04/12 15:10:31 INFO server.AbstractConnector: Stopped Spark@6ca0256d{HTTP/1.1,[http/1.1]}{0.0.0.0:4040}
19/04/12 15:10:31 INFO ui.SparkUI: Stopped Spark web UI at http://172.18.94.121:4040
19/04/12 15:10:31 INFO spark.MapOutputTrackerMasterEndpoint: MapOutputTrackerMasterEndpoint stopped!
19/04/12 15:10:31 INFO memory.MemoryStore: MemoryStore cleared
19/04/12 15:10:31 INFO storage.BlockManager: BlockManager stopped
19/04/12 15:10:31 INFO storage.BlockManagerMaster: BlockManagerMaster stopped
19/04/12 15:10:31 INFO scheduler.OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped!
19/04/12 15:10:31 INFO spark.SparkContext: Successfully stopped SparkContext
19/04/12 15:10:31 INFO util.ShutdownHookManager: Shutdown hook called
19/04/12 15:10:31 INFO util.ShutdownHookManager: Deleting directory C:\Users\Administrator\AppData\Local\Temp\spark-fcc174bd-0722-4b43-9852-522997a84140

Process finished with exit code 1

3、
因为写spark的时候用的0.8版本kafka的依赖，但是cdh集群是1.0kafka，所以在集群上运行jar包的时候报错：

spark Exception in thread "main" java.lang.NoSuchMethodError: kafka.api.TopicMetadata.errorCode

后面改成1.0版本kafka的依赖就可以了
使用0.8版本kafka依赖和使用1.0版本kafka的区别：
pom依赖：

            org.apache.spark
            spark-streaming-kafka-0-10_2.11
            2.0.0
        

        
            
            
            
        

package com.jenny.spark
import cn.just.spark.domain.Test02
import kafka.serializer.StringDecoder
import org.apache.kafka.clients.consumer.{ConsumerConfig, ConsumerRecord}
import org.apache.kafka.common.serialization.StringDeserializer
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.types.{IntegerType, StringType, StructField, StructType}
import org.apache.spark.sql.{DataFrame, Row, SparkSession}
import org.apache.spark.streaming.dstream.{DStream, InputDStream}
import org.apache.spark.streaming.kafka010.{ConsumerStrategies, ConsumerStrategy, LocationStrategies, LocationStrategy}
//import org.apache.spark.streaming.kafka.KafkaUtils
import org.apache.spark.streaming.kafka010.KafkaUtils
import org.apache.spark.streaming.{Seconds, StreamingContext}
import org.apache.spark.{SparkContext}
object SparkStreamingKafkaDirect {
def main(args: Array[String]): Unit = {
// 用的下面的属性
val spark: SparkSession = SparkSession.builder().appName(“SparkStreamingKafkaDirect”).master(“local[2]”).getOrCreate()
val sc: SparkContext = spark.sparkContext
sc.setLogLevel(“WARN”)
//设置schema结构
val schema = StructType(
Seq(
StructField(“col1”,StringType,true)
,StructField(“col2”,StringType,true)
,StructField(“col3”,StringType,true)
,StructField(“col4”,StringType,true)
,StructField(“update_time”,StringType,true)
)
)
//1、创建streamingcontext
val ssc: StreamingContext = new StreamingContext(sc,Seconds(10))
//2、准备kafka参数
// val kafkaparams = Map(“metadata.broker.list”->“node01:9092”,“group.id”->“spark_direct”) //0.8版本kafka
//1.0版本kafka
val kafkaparams = Map[String, Object](
ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG ->“node01:9092”,
ConsumerConfig.GROUP_ID_CONFIG -> “spark_direct”,
ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG -> classOf[StringDeserializer],
ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG -> classOf[StringDeserializer])
val topics=Set(“from_flume01”)
//3、获取kafka中的数据
// val dstream: InputDStream[(String, String)] = KafkaUtils.createDirectStream[String,String,StringDecoder,StringDecoder](ssc,kafkaparams,topics)//0.8版本kafka
val dstream: InputDStream[ConsumerRecord[String, String]] = KafkaUtils.createDirectStream[String, String](
ssc,
LocationStrategies.PreferConsistent,
ConsumerStrategies.Subscribe[String,String](topics,kafkaparams))
// val data: DStream[String] = dstream.map(_.2) //0.8版本kafka
val data: DStream[String] = dstream.map(.value)
data.foreachRDD(rdd=>
{
val rrdd: RDD[Row] = rdd.map(x=>x.split(",")).map(x=>Row(x(0), x(1), x(2), x(3), x(4)))
val tRdd: RDD[Test02] = rdd.map(x=>x.split(",")).map(x=>Test02(x(0),x(1),x(2),x(3),x(4)))
import spark.implicits._
val tDF: DataFrame = tRdd.toDF()
//将数据写到hive里面
// tDF.write.format(“textfile”).mode(saveMode = “Append”).insertInto(“test.test01”)
println("++++++++++++++++")
tDF.show
}
)
println("--------------")
//4、开启流式计算
ssc.start()
ssc.awaitTermination()
}
}

4、spark在代码中设置master为standalone模式：

val spark: SparkSession = SparkSession.builder().appName(“SparkStreamingKafkaDirect”).master(“spark://ip地址:7337”).getOrCreate()

报错：

19/04/26 16:09:10 INFO StandaloneAppClient$ClientEndpoint: Connecting to master spark://ip地址:7337...
19/04/26 16:09:10 WARN StandaloneAppClient$ClientEndpoint: Failed to connect to master ip地址:7337
org.apache.spark.SparkException: Exception thrown in awaitResult: 
	at org.apache.spark.util.ThreadUtils$.awaitResult(ThreadUtils.scala:205)
	at org.apache.spark.rpc.RpcTimeout.awaitResult(RpcTimeout.scala:75)
	at org.apache.spark.rpc.RpcEnv.setupEndpointRefByURI(RpcEnv.scala:100)
	at org.apache.spark.rpc.RpcEnv.setupEndpointRef(RpcEnv.scala:108)
	at org.apache.spark.deploy.client.StandaloneAppClient$ClientEndpoint$$anonfun$tryRegisterAllMasters$1$$anon$1.run(StandaloneAppClient.scala:106)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.RuntimeException: java.lang.IndexOutOfBoundsException: readerIndex(5) + length(864567) exceeds writerIndex(178): UnpooledUnsafeDirectByteBuf(ridx: 5, widx: 178, cap: 178/178)
	at org.spark_project.io.netty.buffer.AbstractByteBuf.checkReadableBytes0(AbstractByteBuf.java:1401)
	at org.spark_project.io.netty.buffer.AbstractByteBuf.checkReadableBytes(AbstractByteBuf.java:1388)
	at org.spark_project.io.netty.buffer.AbstractByteBuf.readBytes(AbstractByteBuf.java:870)
	at org.spark_project.io.netty.buffer.AbstractByteBuf.readBytes(AbstractByteBuf.java:878)
	at org.apache.spark.network.protocol.Encoders$Strings.decode(Encoders.java:42)
	at org.apache.spark.network.shuffle.protocol.UploadBlock.decode(UploadBlock.java:110)
	at org.apache.spark.network.shuffle.protocol.BlockTransferMessage$Decoder.fromByteBuffer(BlockTransferMessage.java:65)
	at org.apache.spark.network.shuffle.ExternalShuffleBlockHandler.receive(ExternalShuffleBlockHandler.java:81)
	at org.apache.spark.network.server.TransportRequestHandler.processRpcRequest(TransportRequestHandler.java:157)
	at org.apache.spark.network.server.TransportRequestHandler.handle(TransportRequestHandler.java:105)
	at org.apache.spark.network.server.TransportChannelHandler.channelRead(TransportChannelHandler.java:118)
	at org.spark_project.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
	at org.spark_project.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:348)
	at org.spark_project.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:340)
	at org.spark_project.io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
	at org.spark_project.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:362)
……

19/04/26 16:09:31 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped!
19/04/26 16:09:32 ERROR SparkContext: Error initializing SparkContext.
java.lang.IllegalArgumentException: requirement failed: Can only call getServletHandlers on a running MetricsSystem
	at scala.Predef$.require(Predef.scala:224)
	at org.apache.spark.metrics.MetricsSystem.getServletHandlers(MetricsSystem.scala:91)
	at org.apache.spark.SparkContext.(SparkContext.scala:524)
	at org.apache.spark.SparkContext$.getOrCreate(SparkContext.scala:2509)
	at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:909)
	at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:901)
	at scala.Option.getOrElse(Option.scala:121)
	at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:901)
	at com.jenny.spark.SparkStreamingKafkaDirect$.main(SparkStreamingKafkaDirect.scala:28)
	at com.jenny.spark.SparkStreamingKafkaDirect.main(SparkStreamingKafkaDirect.scala)
19/04/26 16:09:32 INFO SparkContext: SparkContext already stopped.
Exception in thread "main" java.lang.IllegalArgumentException: requirement failed: Can only call getServletHandlers on a running MetricsSystem
	at scala.Predef$.require(Predef.scala:224)
	at org.apache.spark.metrics.MetricsSystem.getServletHandlers(MetricsSystem.scala:91)
	at org.apache.spark.SparkContext.(SparkContext.scala:524)
	at org.apache.spark.SparkContext$.getOrCreate(SparkContext.scala:2509)
	at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:909)
	at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:901)
	at scala.Option.getOrElse(Option.scala:121)
	at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:901)
	at com.jenny.spark.SparkStreamingKafkaDirect$.main(SparkStreamingKafkaDirect.scala:28)
	at com.jenny.spark.SparkStreamingKafkaDirect.main(SparkStreamingKafkaDirect.scala)
19/04/26 16:09:32 INFO SparkContext: Successfully stopped SparkContext
19/04/26 16:09:32 INFO ShutdownHookManager: Shutdown hook called
19/04/26 16:09:32 INFO ShutdownHookManager: Deleting directory C:\Users\Administrator\AppData\Local\Temp\spark-d6b03962-4d1a-4bc9-b93b-5a0550f84240

（1）但是改为local模式之后，就没报错了。
（2）如果代码中不设置master模式，在spark-submit提交的时候，设置为
spark-submit
–class com.jenny.spark.SparkStreamingKafkaDirect
–master spark://node01:7077
–executor-memory 1g
–total-executor-cores 2
报错：

19/04/26 17:07:12 INFO client.StandaloneAppClient$ClientEndpoint: Connecting to master spark://node01:7077...
19/04/26 17:07:12 WARN client.StandaloneAppClient$ClientEndpoint: Failed to connect to master node01:7077
org.apache.spark.SparkException: Exception thrown in awaitResult: 
	at org.apache.spark.util.ThreadUtils$.awaitResult(ThreadUtils.scala:205)
	at org.apache.spark.rpc.RpcTimeout.awaitResult(RpcTimeout.scala:75)
	at org.apache.spark.rpc.RpcEnv.setupEndpointRefByURI(RpcEnv.scala:100)
	at org.apache.spark.rpc.RpcEnv.setupEndpointRef(RpcEnv.scala:108)
	at org.apache.spark.deploy.client.StandaloneAppClient$ClientEndpoint$$anonfun$tryRegisterAllMasters$1$$anon$1.run(StandaloneAppClient.scala:106)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Failed to connect to node01/ip地址:7077
	at org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:232)
	at org.apache.spark.network.client.TransportClientFactory.createClient(TransportClientFactory.java:182)
	at org.apache.spark.rpc.netty.NettyRpcEnv.createClient(NettyRpcEnv.scala:197)
	at org.apache.spark.rpc.netty.Outbox$$anon$1.call(Outbox.scala:194)
	at org.apache.spark.rpc.netty.Outbox$$anon$1.call(Outbox.scala:190)
	... 4 more
Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: node01/ip地址:7077
	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
	at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:323)
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
	... 1 more
Caused by: java.net.ConnectException: Connection refused

结论：在代码里设置master为local，在spark-submit提交的时候，master为standalone模式，就ok了

参考https://blog.csdn.net/huonan_123/article/details/84282843，几种模式提交的时候设置master不同而已，但是spark代码都是写的local

5、用yarn-cluster模式提交，一段时间之后，spark没有接收到数据，就报了这个错：

19/04/26 18:39:10 WARN conf.HiveConf: HiveConf of name hive.strict.checks.cartesian.product does not exist
19/04/26 18:40:30 ERROR yarn.ApplicationMaster: Uncaught exception: 
java.util.concurrent.TimeoutException: Futures timed out after [100000 milliseconds]
	at scala.concurrent.impl.Promise$DefaultPromise.ready(Promise.scala:219)
	at scala.concurrent.impl.Promise$DefaultPromise.result(Promise.scala:223)
	at org.apache.spark.util.ThreadUtils$.awaitResult(ThreadUtils.scala:201)
	at org.apache.spark.deploy.yarn.ApplicationMaster.runDriver(ApplicationMaster.scala:454)
	at org.apache.spark.deploy.yarn.ApplicationMaster.org$apache$spark$deploy$yarn$ApplicationMaster$$runImpl(ApplicationMaster.scala:296)
	at org.apache.spark.deploy.yarn.ApplicationMaster$$anonfun$run$2.apply$mcV$sp(ApplicationMaster.scala:223)
	at org.apache.spark.deploy.yarn.ApplicationMaster$$anonfun$run$2.apply(ApplicationMaster.scala:223)
	at org.apache.spark.deploy.yarn.ApplicationMaster$$anonfun$run$2.apply(ApplicationMaster.scala:223)
	at org.apache.spark.deploy.yarn.ApplicationMaster$$anon$4.run(ApplicationMaster.scala:802)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:422)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1726)
	at org.apache.spark.deploy.yarn.ApplicationMaster.doAsUser(ApplicationMaster.scala:801)
	at org.apache.spark.deploy.yarn.ApplicationMaster.run(ApplicationMaster.scala:222)
	at org.apache.spark.deploy.yarn.ApplicationMaster$.main(ApplicationMaster.scala:835)
	at org.apache.spark.deploy.yarn.ApplicationMaster.main(ApplicationMaster.scala)


For more detailed output, check the application tracking page: http://node01:8088/cluster/app/application_1556244595224_0003 Then click on links to logs of each attempt.
. Failing the application.
	 ApplicationMaster host: N/A
	 ApplicationMaster RPC port: -1
	 queue: root.users.root
	 start time: 1556275020864
	 final status: FAILED
	 tracking URL: http://node01:8088/cluster/app/application_1556244595224_0003
	 user: root
Exception in thread "main" org.apache.spark.SparkException: Application application_1556244595224_0003 finished with failed status
	at org.apache.spark.deploy.yarn.Client.run(Client.scala:1127)
	at org.apache.spark.deploy.yarn.Client$.main(Client.scala:1173)
	at org.apache.spark.deploy.yarn.Client.main(Client.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:775)
	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)
	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)
	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:119)
	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
19/04/26 18:40:32 INFO util.ShutdownHookManager: Shutdown hook called
19/04/26 18:40:32 INFO util.ShutdownHookManager: Deleting directory /tmp/spark-c628fa05-a49f-41b2-98bb-522749e1ffa8

6、用spark连接hbase的时候报错：

19/05/28 16:41:42 WARN zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection timed out: no further information
	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
	at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)
	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
19/05/28 16:41:43 INFO zookeeper.ClientCnxn: Opening socket connection to server iP地址/iP地址:2181. Will not attempt to authenticate using SASL (unknown error)

pom文件为：

4.0.0

com.jenny.spark.hbase
connect_hbase03
1.0-SNAPSHOT



    2.11.8
    1.0.0
    2.2.0
    2.6.0-cdh5.9.0
    1.2.0-cdh5.9.0





    cloudera
    https://repository.cloudera.com/artifactory/cloudera-repos



    
        org.scala-lang
        scala-library
        ${scala.version}
    
    
    

    
    
        org.apache.hadoop
        hadoop-client
        ${hadoop.version}
    

    
    
        org.apache.hbase
        hbase-client
        ${hbase.version}
    

    
        org.apache.hbase
        hbase-server
        ${hbase.version}
    

    
    
        org.apache.spark
        spark-streaming_2.11
        ${spark.version}
    


    
        org.apache.spark
        spark-streaming-kafka-0-10_2.11
        2.0.0
    
    
        org.apache.commons
        commons-lang3
        3.5
    
    
    
        org.apache.spark
        spark-sql_2.11
        ${spark.version}
    
    
        net.jpountz.lz4
        lz4
        1.3.0
    

    
        com.fasterxml.jackson.module
        jackson-module-scala_2.11
        2.6.5
    




    
        
            org.apache.maven.plugins
            maven-assembly-plugin
            2.4.1
            
                
                
                    jar-with-dependencies
                
                
                
                    
                        com.jenny.spark.hbase.TestHBase02
                    
                

            
            
                
                    make-assembly
                    
                    package
                    
                        single
                    
                
            
        
        
            
            net.alchim31.maven
            scala-maven-plugin
            3.2.2
            
                
                    
                        compile
                        testCompile
                    
                    
                        
                            
                            -dependencyfile
                            ${project.build.directory}/.scala_dependencies
                        
                    
                
            
        

    

6、sparksql 连接mysql数据库
pom.xml:

            mysql
            mysql-connector-java
            5.1.38
        
        
            org.apache.spark
            spark-sql_2.11
            2.2.0
        

代码：

object MysqlUtils01 {

  def main(args: Array[String]): Unit = {
    val jdbcURL = "…………"
    val userName = "……"
    val passWord = "……"
    val prop = new Properties()
    prop.put("user", userName)
    prop.put("password", passWord)

    val conf = new SparkConf().setMaster("local[*]").setAppName("from-to-mysql")
    val sparkContext = new SparkContext(conf)
    val sqlContext = new SQLContext(sparkContext)
    val sql_df = sqlContext.read.jdbc(jdbcURL, "dim_user_dep2", prop)
    sql_df.show
  }
}

报错：

java.lang.RuntimeException: Multiple sources found for jdbc
(org.apache.spark.sql.execution.datasources.jdbc.JdbcRelationProvider,
org.apache.spark.sql.execution.datasources.jdbc.DefaultSource), please
specify the fully qualified class name.

将获取DF的过程修改为以下代码就能正常执行了：

    val sql_df = sqlContext.read.format("org.apache.spark.sql.execution.datasources.jdbc.DefaultSource") .options(Map("url" -> jdbcURL, "driver"
       -> "com.mysql.jdbc.Driver", "dbtable" -> "dim_user_dep2", "user" -> "sx_etl",
    "password" -> "dsuukXTMvf")).load()
    sql_df.show

7、spark连redis的时候报错1）：ConnectException: Connection refused: connect
解决办法：参考https://www.cnblogs.com/shamo89/p/6681256.html
Redis.conf配置文件中 注释掉 bind 127.0.0.1
防火墙关闭（或添加可访问的端口，具体不在此描述）

报错2）：JedisDataException: DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified, no authentication password is requested to clients.

解决方法：
修改配置文件redis.conf。将NETWORK下的protected-mode yes修改
为protected-mode no，然后重启服务

8、spark提交模式为yarn，报错：
System memory 452460544 must be at least 471859200
最后重新设置executor-memory，从450M加到512M，问题解决。
spark-submit
–class com.jenny.spark.sx.Analysis
–master yarn
–deploy-mode cluster
–executor-memory 512M
–driver-cores 3
bigdata_sx03_master-1.0-SNAPSHOT-jar-with-dependencies.jar

9、 sparkstreaming里面给StreamingContext设置了checkpoint之后报错：
ssc.checkpoint(“F:\IdeaProjects\spark\sx\bigdata_sx03_master\src\main\resources\checkpoint”)

Exception in thread "pool-18-thread-2" java.lang.NullPointerException
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)
	at org.apache.hadoop.util.Shell.runCommand(Shell.java:505)
	at org.apache.hadoop.util.Shell.run(Shell.java:478)
	at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:738)
	at org.apache.hadoop.util.Shell.execCommand(Shell.java:831)
	at org.apache.hadoop.util.Shell.execCommand(Shell.java:814)
	at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:664)
	at org.apache.hadoop.fs.FilterFileSystem.setPermission(FilterFileSystem.java:506)
	at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:462)
	at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:428)
	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:920)
	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:901)
	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:798)
	at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:787)
	at org.apache.spark.streaming.CheckpointWriter$CheckpointWriteHandler.run(Checkpoint.scala:237)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

解决方法：路径写成hdfs的目录，然后程序不放在windows里面的idea执行，而放到cdh集群里面执行，就正常了。

10、spark代码，告警：

Truncated the string representation of a plan since it was too large. This behavior can be adjusted by setting 'spark.debug.maxToStringFields' in SparkEnv.conf.

解决办法：
在读入数据字段量较大的表时，会提示此错误，在windows平台配置文件上可以直接修改，或者在程序内部直接修改

如代码中所示，.conf(config(‘spark.debug.maxToStringFields’, ‘100’))来修改配置

SparkSession
        .builder()
        .master("local[4]")
        .appName("report")
        .config("spark.debug.maxToStringFields", "100")
        .getOrCreate();

11、sparkstreaming集成kafka，结果放入redis，但是跑着跑着，5分钟之后，sparkstreaming就阻塞了，

 dstream.foreachRDD(rdd=>if (!rdd.isEmpty()){
      // 获取偏移量
      offsetRanges = rdd.asInstanceOf[HasOffsetRanges].offsetRanges
      for (offsetInfo <- offsetRanges){
        println("fromOffset:" + offsetInfo.fromOffset)
        println("untilOffset:" + offsetInfo.untilOffset)
        println("topic:" + offsetInfo.topic)
        println("partition:" + offsetInfo.partition)
      }
      // 处理数据
      val map_rdd = rdd.map(_.value())
      val today = new SimpleDateFormat("yyyy-MM-dd").format(new Date)
      //1、取最新的维表数据ETL_Dm.dim_user_dep2
      val dimensionPeriodDF = DimensionsLoader.getDimension(sparkSession)
      dimensionPeriodDF.createOrReplaceTempView("dimensionPeriodDF")
      //2、分析订单表子订单表，将user_id对应的付款总金额及其他信息放入redis
      DF2Redis.orders2Redis(sparkSession,map_rdd,today)
      // 提交offset
      dstream.asInstanceOf[CanCommitOffsets].commitAsync(offsetRanges)

    })

redis连接是用的Jedis连接池取得：pool.getResource

网上找到遇到这种情况的以下解决方法：

1）、对于 Direct Approach 的数据接收，我们可以通过配置 spark.streaming.kafka.maxRatePerPartition参数来限制每次作业中每个 Kafka 分区最多读取的记录条数。——我改了之后，没用

2）、设置sparkcontext参数的时候，用local[*]，而不是local或者local[1]，因为一个线程拿来跑driver了，就没多的线程跑数据了——我改了之后，没用

3）、第一，减小spark.streaming.kafka.consumer.poll.ms参数到3000ms以内，即3秒超时就重试，第二，将spark.task.maxFailures改为10，默认值是4，加大重试次数，修改完这两个参数后基本上解决了这个问题，多数批次在阻塞重连后都能很快读到消息并运行成功。——我改了之后，没用

4）、offset自己提交出错。——我改了之后，没用
改回kafka的offset自动提交，注释掉手动提交，但是保留获取offset的语句：dstream里面没有执行卡住的时候，没有内容，但是实际上还是自动提交了offset，消费offset随着Kafka在走。CURRENT-OFFSET在实时更新。
改回手动提交，注释掉offsetRanges初始化为空的语句，在dstream里面获取offset数据。结果数据在跑，sparkstreaming有消费，但是消费的offset，CURRENT-OFFSET显示滞后，没有消费。sparkstreaming阻塞之后，程序也没消费了，dstream里面也没有获取到offset值了。

5）、修改sparkstreaming批间隔时间。——我改了之后，没用

6）、修改redis最大连接数，从20修改为100之后，卡住的时间点从5分钟之后变成了21分钟之后。
确定是redis连接的问题。最后发现是jedis连接在用完之后没有关闭，用完之后，加上jedis.close()之后，搞定，没有阻塞了。

12、在sparkstreaming停止的过程中，Kafka中积压了很多数据，重启sparkstreaming的时候，报错：

sparkstreaming kafka Failed to get records for after polling for 512

解决方法：

new SparkConf().setAppName("XX").setMaster("local")
 
  .set("spark.streaming.kafka.consumer.poll.ms", "30000");

参考：https://blog.csdn.net/lmb09122508/article/details/80522252

13、spark把dataframe结果写入hdfs
dimensionPeriodDF.write.mode(“append”).orc(“hdfs://……”)
如果是orc的必须要hive支持，不然会报错：

Exception in thread "main" org.apache.spark.sql.AnalysisException: The ORC data source must be used with Hive support enabled;```



14、spark 写：
      // 获取偏移量(由kafka保管offset)
      offsetRanges = rdd.repartition(1).asInstanceOf[HasOffsetRanges].offsetRanges
报错：

java.lang.ClassCastException: org.apache.spark.rdd.MapPartitionsRDD cannot be cast to org.apache.spark.streaming.kafka010.HasOffsetRanges