原创问题定位分享（16）spark写数据到hive外部表报错ClassCastException: org.apache.hadoop.hive.hbase.HiveHBaseTableOutpu(代

Posted 2021-01-28 Thinking in BigData

 spark 2.1.1

 

spark在写数据到hive外部表（底层数据在hbase中）时会报错

Caused by: java.lang.ClassCastException: org.apache.hadoop.hive.hbase.HiveHBaseTableOutputFormat cannot be cast to org.apache.hadoop.hive.ql.io.HiveOutputFormat
at org.apache.spark.sql.hive.SparkHiveWriterContainer.outputFormat$lzycompute(hiveWriterContainers.scala:82)

 

org.apache.spark.sql.hive.SparkHiveWriterContainer

org.apache.spark.sql.hive.SparkHiveWriterContainer
  @transient private lazy val outputFormat = conf.value.getOutputFormat.asInstanceOf[HiveOutputFormat[AnyRef, Writable]]

 

报错的是这一句，查看代码发现此时这个变量并没有什么用处，可以在不能cast时置为null

  @transient private lazy val outputFormat =
    // conf.value.getOutputFormat.asInstanceOf[HiveOutputFormat[AnyRef, Writable]]
    conf.value.getOutputFormat match {
      case format if format.isInstanceOf[HiveOutputFormat[AnyRef, Writable]] => format.asInstanceOf[HiveOutputFormat[AnyRef, Writable]]
      case _ => null
    }

问题解决，官方讨论如下： https://issues.apache.org/jira/browse/SPARK-6628