java - Spark SQLContext 找不到配置单元表

Question

我尝试通过一个简单的 Spark 作业(用 Java 编写)查询 Hive 表。

SparkConf conf = new SparkConf().setMaster("local[*]").setAppName("MyJob");

JavaSparkContext sc = new JavaSparkContext(conf);
SQLContext sqlContext = new org.apache.spark.sql.SQLContext(sc);

DataFrame df = sqlContext.table("scf");

但是当我通过spark-submit 提交jar 时，出现以下错误:

Exception in thread "main" org.apache.spark.sql.catalyst.analysis.NoSuchTableException
    at org.apache.spark.sql.catalyst.analysis.SimpleCatalog.lookupRelation(Catalog.scala:108)
    at org.apache.spark.sql.SQLContext.table(SQLContext.scala:831)
    at org.apache.spark.sql.SQLContext.table(SQLContext.scala:827)
    at MyJob.myJob(MyJob.java:30)
    at MyJob.main(MyJob.java:65)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:729)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

我确定表存在。如果我在 spark-shell 中运行 sqlContext.table("scf").count，它会给出结果。

可能是什么问题？

谢谢!

Answer 1

SQLContex 不支持 Hive。您必须使用支持 Hive 的 HiveContext 或 SparkSession。

import org.apache.spark.sql.hive.HiveContext

val sqlContext = new HiveContext(sc)