1）自己手工将jar加到classpath

spark-2.4.2-bin-hadoop2.6
+
kudu-spark2_2.11-1.7.0-cdh5.16.1.jar

# bin/spark-shell
scala> val df = spark.read.options(Map("kudu.master" -> "master:7051", "kudu.table" -> "impala::test.tbl_test")).format("kudu").load
java.lang.ClassNotFoundException: Failed to find data source: kudu. Please find packages at http://spark.apache.org/third-party-projects.html
  at org.apache.spark.sql.execution.datasources.DataSource$.lookupDataSource(DataSource.scala:660)
  at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:194)
  at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:167)
  ... 49 elided
Caused by: java.lang.ClassNotFoundException: kudu.DefaultSource
  at scala.reflect.internal.util.AbstractFileClassLoader.findClass(AbstractFileClassLoader.scala:72)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
  at org.apache.spark.sql.execution.datasources.DataSource$.$anonfun$lookupDataSource$5(DataSource.scala:634)
  at scala.util.Try$.apply(Try.scala:213)
  at org.apache.spark.sql.execution.datasources.DataSource$.$anonfun$lookupDataSource$4(DataSource.scala:634)
  at scala.util.Failure.orElse(Try.scala:224)
  at org.apache.spark.sql.execution.datasources.DataSource$.lookupDataSource(DataSource.scala:634)
  ... 51 more

2）采用官方的方式（将kudu版本改为1.7.0）

spark-2.4.2-bin-hadoop2.6

# bin/spark-shell --packages org.apache.kudu:kudu-spark2_2.11:1.7.0

same error

3）采用官方的方式（不修改）

spark-2.4.2-bin-hadoop2.6

# bin/spark-shell --packages org.apache.kudu:kudu-spark2_2.11:1.9.0
scala> val df = spark.read.options(Map("kudu.master" -> "master:7051", "kudu.table" -> "impala::test.tbl_test")).format("kudu").load
java.lang.NoClassDefFoundError: scala/Product$class
  at org.apache.kudu.spark.kudu.Upsert$.<init>(OperationType.scala:41)
  at org.apache.kudu.spark.kudu.Upsert$.<clinit>(OperationType.scala)
  at org.apache.kudu.spark.kudu.DefaultSource$$anonfun$getOperationType$2.apply(DefaultSource.scala:217)
  at org.apache.kudu.spark.kudu.DefaultSource$$anonfun$getOperationType$2.apply(DefaultSource.scala:217)
  at scala.Option.getOrElse(Option.scala:138)
  at org.apache.kudu.spark.kudu.DefaultSource.getOperationType(DefaultSource.scala:217)
  at org.apache.kudu.spark.kudu.DefaultSource.createRelation(DefaultSource.scala:104)
  at org.apache.kudu.spark.kudu.DefaultSource.createRelation(DefaultSource.scala:87)
  at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:318)
  at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:223)
  at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:211)
  at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:167)
  ... 49 elided
Caused by: java.lang.ClassNotFoundException: scala.Product$class
  at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
  ... 61 more

看起来是scala版本冲突，到spark下载页面发现一句话：

Note that, Spark is pre-built with Scala 2.11 except version 2.4.2, which is pre-built with Scala 2.12.

4）kudu-spark改为scala2.12

spark-2.4.2-bin-hadoop2.6

# bin/spark-shell --packages org.apache.kudu:kudu-spark2_2.12:1.9.0

        ::::::::::::::::::::::::::::::::::::::::::::::

        ::          UNRESOLVED DEPENDENCIES         ::

        ::::::::::::::::::::::::::::::::::::::::::::::

        :: org.apache.kudu#kudu-spark2_2.12;1.9.0: not found

        ::::::::::::::::::::::::::::::::::::::::::::::

好吧，下载2.4.3

5）采用官方的方式（继续）

spark-2.4.3-bin-hadoop2.6

# bin/spark-shell --packages org.apache.kudu:kudu-spark2_2.11:1.9.0
scala> val df = spark.read.options(Map("kudu.master" -> "master:7051", "kudu.table" -> "impala::test.tbl_test")).format("kudu").load
df: org.apache.spark.sql.DataFrame = [order_no: string, id: bigint ... 28 more fields]

正常了

6）采用官方的方式（将kudu版本改为1.7.0）

spark-2.4.3-bin-hadoop2.6

# bin/spark-shell --packages org.apache.kudu:kudu-spark2_2.11:1.7.0

same error

看来spark连接kudu只能采用scala2.11+kudu-spark2_2.11:1.9.0

参考：
https://kudu.apache.org/docs/developing.html
http://spark.apache.org/downloads.html