spark问题集锦

1、 Scala报错 Exception in thread "main" java.lang.reflect.InvocationTargetException scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;

Exception in thread "main" java.lang.reflect.InvocationTargetException
	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 com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:64)
Caused by: java.lang.NoSuchMethodError: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;
	at com.wxdata.phonecharge.utils.JedisSentinelPoolUtils$.<init>(JedisSentinelPoolUtils.scala:20)
	at com.wxdata.phonecharge.utils.JedisSentinelPoolUtils$.<clinit>(JedisSentinelPoolUtils.scala)
	at com.wxdata.phonecharge.app.ImportHfSupplierOrderBatch$.main(ImportHfSupplierOrderBatch.scala:13)
	at com.wxdata.phonecharge.app.ImportHfSupplierOrderBatch.main(ImportHfSupplierOrderBatch.scala)
	... 5 more

代码如下，一个简单的类，但是在启动时即报错，目测应该是环境配置的问题。

  def main(args: Array[String]): Unit = {
    //val sparkSession = BuildUtils.initSparkSession(true)

    // 读取
    val redisKey = "data_middle_platform:offset:table_import"
    val colOffset: String = JedisSentinelPoolUtils.hget(redisKey, "ImportHfSupplierOrderBatch")
    if(StringUtils.isNotBlank(colOffset)){
      println("=============")
    }
    println("-------------")

问题解决：
问题是由于pom文件中配置了Scala的版本，idea中也配置了Scala的版本，二者不一致导致的。

注意：这种情况下，maven会自动下载一个对应版本的scala包，要选择那一个。如选择了一个高本版的本地scala，然后将scala version选择为2.11 ，也可能会出问题，如下所示。

此时仍然报错，和之前错误一样。
正确配置就是：

2、spark本地运行报错 java.lang.NoClassDefFoundError: org/apache/spark/sql/SparkSession

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/spark/sql/SparkSession
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
	at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
	at java.lang.Class.getMethod0(Class.java:3018)
	at java.lang.Class.getMethod(Class.java:1784)
	at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:62)
Caused by: java.lang.ClassNotFoundException: org.apache.spark.sql.SparkSession
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 6 more

原因是NoClassDefFoundError表示在运行时找不到类，provided导致在编译时忽略了这个依赖， 把这行注释掉即可!

或者：编辑启动参数，将图中的√打上即可。

3、spark在读取或写入json和csv时报 java.lang.IllegalArgumentException: Illegal pattern component: XXX

测试代码为：

 val frame = WXSource.readData(sparkSession, "mysql", "select e_avg_profit_rate from `data_middle_platform`.`test_phone_charge` limit 10")

    frame.show()

    frame.write
      .option("header", "false")
      .mode(SaveMode.Append)
      .csv("file:///D:\\WorSpace\\wx_spark_ml\\wxdatasparkml\\phonecharge\\src\\main\\resources\\data\\a.csv")

具体保存信息为：

Exception in thread "main" java.lang.reflect.InvocationTargetException
	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 com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:64)
Caused by: java.lang.IllegalArgumentException: Illegal pattern component: XXX
	at org.apache.commons.lang3.time.FastDatePrinter.parsePattern(FastDatePrinter.java:282)
	at org.apache.commons.lang3.time.FastDatePrinter.init(FastDatePrinter.java:149)
	at org.apache.commons.lang3.time.FastDatePrinter.<init>(FastDatePrinter.java:142)
	at org.apache.commons.lang3.time.FastDateFormat.<init>(FastDateFormat.java:384)
	at org.apache.commons.lang3.time.FastDateFormat.<init>(FastDateFormat.java:369)
	at org.apache.commons.lang3.time.FastDateFormat$1.createInstance(FastDateFormat.java:91)
	at org.apache.commons.lang3.time.FastDateFormat$1.createInstance(FastDateFormat.java:88)
	at org.apache.commons.lang3.time.FormatCache.getInstance(FormatCache.java:82)
	at org.apache.commons.lang3.time.FastDateFormat.getInstance(FastDateFormat.java:165)
	at org.apache.spark.sql.execution.datasources.csv.CSVOptions.<init>(CSVOptions.scala:139)
	at org.apache.spark.sql.execution.datasources.csv.CSVOptions.<init>(CSVOptions.scala:41)
	at org.apache.spark.sql.execution.datasources.csv.CSVFileFormat.prepareWrite(CSVFileFormat.scala:72)
	at org.apache.spark.sql.execution.datasources.FileFormatWriter$.write(FileFormatWriter.scala:103)
	at org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelationCommand.run(InsertIntoHadoopFsRelationCommand.scala:159)
	at org.apache.spark.sql.execution.command.DataWritingCommandExec.sideEffectResult$lzycompute(commands.scala:104)
	at org.apache.spark.sql.execution.command.DataWritingCommandExec.sideEffectResult(commands.scala:102)
	at org.apache.spark.sql.execution.command.DataWritingCommandExec.doExecute(commands.scala:122)
	at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:131)
	at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$1.apply(SparkPlan.scala:127)
	at org.apache.spark.sql.execution.SparkPlan$$anonfun$executeQuery$1.apply(SparkPlan.scala:155)
	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:151)
	at org.apache.spark.sql.execution.SparkPlan.executeQuery(SparkPlan.scala:152)
	at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:127)
	at org.apache.spark.sql.execution.QueryExecution.toRdd$lzycompute(QueryExecution.scala:80)
	at org.apache.spark.sql.execution.QueryExecution.toRdd(QueryExecution.scala:80)
	at org.apache.spark.sql.DataFrameWriter$$anonfun$runCommand$1.apply(DataFrameWriter.scala:668)
	at org.apache.spark.sql.DataFrameWriter$$anonfun$runCommand$1.apply(DataFrameWriter.scala:668)
	at org.apache.spark.sql.execution.SQLExecution$$anonfun$withNewExecutionId$1.apply(SQLExecution.scala:78)
	at org.apache.spark.sql.execution.SQLExecution$.withSQLConfPropagated(SQLExecution.scala:125)
	at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:73)
	at org.apache.spark.sql.DataFrameWriter.runCommand(DataFrameWriter.scala:668)
	at org.apache.spark.sql.DataFrameWriter.saveToV1Source(DataFrameWriter.scala:276)
	at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:270)
	at org.apache.spark.sql.DataFrameWriter.save(DataFrameWriter.scala:228)
	at org.apache.spark.sql.DataFrameWriter.csv(DataFrameWriter.scala:656)
	at test1$.main(test1.scala:30)
	at test1.main(test1.scala)
	... 5 more

问题分析：
1.此问题经常出现在spark2.1.x升级到spark2.2.x的时候出现。比如通过maven构建spark环境的时候，依赖maven进行版本升级。
maven升级的时候，没有自动加载完整依赖包，jsonAPI对于timeStampFormat有特殊需求，默认为yyyy-MM-dd'T'HH:mm:ss.SSSXXX这种格式，是无法被scala-lang包识别的。
2.此问题出现在调用spark.read.json或者csv的时候出现。
问题解决
在读取/写入json/csv时添加.option("timestampFormat", "yyyy/MM/dd HH:mm:ss ZZ")

frame.write
      .option("header", "false")
      .option("timestampFormat", "yyyy/MM/dd HH:mm:ss ZZ")
      .mode("append")
      .mode(SaveMode.Append)
      .csv("file:///D:\\WorSpace\\wx_spark_ml\\wxdatasparkml\\phonecharge\\src\\main\\resources\\data\\a.csv")

默认生成如下图所示：

Spark使用Hadoop文件格式，需要对数据进行分区-这就是为什么写出文件名为part-文件的原因。
如果需要重命名为自己需要的名字，可以写出后再处理，也可以通过自定义outputformat的方式来实现。