Question

我正在尝试读取包含名称的文件，并使用Spark和Scala将名称和时间戳数据一起插入到cassandra表中。以下是我的代码

CREATE TABLE practice.names (
    name text PRIMARY KEY,
    insert_date timestamp
)

cassandra表详情见下文

Exception in thread "main" java.lang.IllegalArgumentException: requirement failed: Columns not found in com.sample.practice.Names: [insert_date]
    at scala.Predef$.require(Predef.scala:233)
    at com.datastax.spark.connector.mapper.DefaultColumnMapper.columnMapForWriting(DefaultColumnMapper.scala:108)
    at com.datastax.spark.connector.writer.MappedToGettableDataConverter$$anon$1.<init>(MappedToGettableDataConverter.scala:29)
    at com.datastax.spark.connector.writer.MappedToGettableDataConverter$.apply(MappedToGettableDataConverter.scala:20)
    at com.datastax.spark.connector.writer.DefaultRowWriter.<init>(DefaultRowWriter.scala:17)
    at com.datastax.spark.connector.writer.DefaultRowWriter$$anon$1.rowWriter(DefaultRowWriter.scala:31)
    at com.datastax.spark.connector.writer.DefaultRowWriter$$anon$1.rowWriter(DefaultRowWriter.scala:29)
    at com.datastax.spark.connector.writer.TableWriter$.apply(TableWriter.scala:271)
    at com.datastax.spark.connector.RDDFunctions.saveToCassandra(RDDFunctions.scala:36)
    at com.sample.practice.CqlInsertDate$.main(CqlInsertDate.scala:30)
    at com.sample.practice.CqlInsertDate.main(CqlInsertDate.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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

当我尝试执行代码时，我收到以下错误

Names(Frank,2017-01-30T14:03:16.911+05:30)
Names(Jean,2017-01-30T14:03:17.115+05:30)
Names(Joe,2017-01-30T14:03:17.116+05:30)

当我尝试打印RDD而不是保存到cassandra时，我得到以下输出

version := "1.0"

scalaVersion := "2.10.6"

libraryDependencies += "com.datastax.spark" % "spark-cassandra-connector_2.10" % "2.0.0-M3"

libraryDependencies += "org.apache.spark" % "spark-core_2.10" % "2.0.2"

libraryDependencies += "org.apache.spark" % "spark-sql_2.10" % "2.0.2"

libraryDependencies += "org.apache.spark" % "spark-hive_2.10" % "2.0.2"

以下是我的SBT档案详情

{{1}}

我正在使用Cassandra 2.1。请帮忙。提前谢谢。

Answer 1

尝试将您的类字段更改为insert_date，反之亦然更改为auditDate

使用Spark Scala将时间戳插入Cassandra

1 个答案: