Question

我有2个数据框，其中包含以下架构：

root
 |-- pid: long (nullable = true)
 |-- lv: timestamp (nullable = true)
root
 |-- m_pid: long (nullable = true)
 |-- vp: double (nullable = true)
 |-- created: timestamp (nullable = true)

如果我尝试显示（）这两个数据帧中的任何一个都一切正常，则会显示前20行。如果我尝试加入这两个数据帧并显示结果（错误没有出现在连接转换中，只有在调用“show”操作时）

var joined = df1.join(df2, df2("pid") === df1("m_pid")).drop("m_pid")
joined.show()

我收到一个我不明白的错误。它与镶木地板有关。其中一个数据框是从实木复合地板中读取的（另一个是从文本中读取的），但如果这是一个与读取数据相关的问题，那么为什么问题只在加入数据帧时出现，而不是在单独显示时出现。

错误是：

org.apache.spark.SparkException: Job aborted due to stage failure: Task 51 in stage 403.0 failed 4 times, most recent failure: Lost task 51.3 in stage 403.0 : java.lang.UnsupportedOperationException: org.apache.parquet.column.values.dictionary.PlainValuesDictionary$PlainLongDictionary

...

Caused by: java.lang.UnsupportedOperationException: org.apache.parquet.column.values.dictionary.PlainValuesDictionary$PlainLongDictionary
  at org.apache.parquet.column.Dictionary.decodeToDouble(Dictionary.java:60)
  at org.apache.spark.sql.execution.vectorized.OnHeapColumnVector.getDouble(OnHeapColumnVector.java:354)
  at org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.processNext(Unknown Source)
  at org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
  at org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$8$$anon$1.hasNext(WholeStageCodegenExec.scala:370)
  at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
  at org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:147)
  at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:79)
  at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:47)
  at org.apache.spark.scheduler.Task.run(Task.scala:85)
  at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:274)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
  ... 1 more

有没有人知道导致错误的原因以及如何解决错误？

加入两个数据帧时的镶木地板错误。 UnsupportedOperationException：... PlainValuesDictionary $ PlainLongDictionary

0 个答案: