Apache spark错误:找不到:value sqlContext

Question

我试图在Windows 10中设置spark.最初,我在启动时遇到了这个错误,并且链接中的解决方案有所帮助.现在我仍然无法运行,import sqlContext.sql因为它仍然会给我一个错误

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Fri Mar 24 12:07:05 IST 2017:
Booting Derby version The Apache Software Foundation - Apache Derby - 10.12.1.1 - (1704137): instance a816c00e-015a-ff08-6530-00000ac1cba8
on database directory C:\metastore_db with class loader org.apache.spark.sql.hive.client.IsolatedClientLoader$$anon$1@37606fee
Loaded from file:/F:/Soft/spark/spark-2.1.0-bin-hadoop2.7/bin/../jars/derby-10.12.1.1.jar
java.vendor=Oracle Corporation
java.runtime.version=1.8.0_101-b13
user.dir=C:\
os.name=Windows 10
os.arch=amd64
os.version=10.0
derby.system.home=null
Database Class Loader started - derby.database.classpath=''
17/03/24 12:07:09 WARN ObjectStore: Failed to get database global_temp, returning NoSuchObjectException
Spark context Web UI available at http://10.128.18.22:4040
Spark context available as 'sc' (master = local[*], app id = local-1490337421381).
Spark session available as 'spark'.
Welcome to
      ____              __
     / __/__  ___ _____/ /__
    _\ \/ _ \/ _ `/ __/  '_/
   /___/ .__/\_,_/_/ /_/\_\   version 2.1.0
      /_/

Using Scala version 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_101)
Type in expressions to have them evaluated.
Type :help for more information.

scala> import sqlContext.sql
<console>:23: error: not found: value sqlContext
       import sqlContext.sql
              ^

Answer 1

Spark上下文可用作'sc'(master = local [*],app id = local-1490337421381).

Spark会话可用作'spark'.

在Spark 2.0.x中,Spark的入口点是SparkSession,它在Spark shell中可用spark,所以请尝试这种方式:

spark.sqlContext.sql(...)

您也可以像这样创建Spark Context

val sqlContext = new org.apache.spark.sql.SQLContext(sc)

第一个选项是我的选择,因为Spark shell已经为你创建了一个,所以请使用它.