【原創】大叔問題定位分享（16）spark寫數據到hive外部表報錯ClassCastException: org.apache.hadoop.hive.hbase.HiveHBaseTableOutputFormat cannot be cast to org.apache.hadoop.hive.ql.io.HiveOutputFormat

 spark 2.1.1

 

spark在寫數據到hive外部表（底層數據在hbase中）時會報錯

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]]

 

報錯的是這一句，查看代碼發現此時這個變量並沒有什么用處，可以在不能cast時置為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
    }

問題解決，官方討論如下： https://issues.apache.org/jira/browse/SPARK-6628