HDFS上的root scratch dir:/ tmp/hive应该是可写的.当前权限是:rwx ---------(在Linux上)

Question

HDFS上的root scratch dir:/ tmp/hive应该是可写的.当前权限是:rwx --------

嗨,我在CDH 5.8的Eclipse中执行以下Spark代码并获得RuntimeExeption

public static void main(String[] args) {
    final SparkConf sparkConf = new SparkConf().setMaster("local").setAppName("HiveConnector");
    final JavaSparkContext sparkContext = new JavaSparkContext(sparkConf);
    SQLContext sqlContext = new HiveContext(sparkContext);

    DataFrame df = sqlContext.sql("SELECT * FROM test_hive_table1");
    //df.show();
    df.count();
 }

根据Exception / tmp/hive,HDFS应该是可写的,但是我们在本地模式下执行spark作业.这意味着本地(linux)文件系统中的目录/ tmp/hive没有可写权限,而不是HDFS.

所以我执行了以下命令以获得许可.

$ sudo chmod -R 777 /tmp/hive

现在它对我有用.

如果在群集模式下执行spark job期间遇到同样的问题,则应在hive conf文件夹的hive-site.xml文件中配置以下属性,然后重新启动hive服务器.

  <property>
    <name>hive.exec.scratchdir</name>
    <value>/tmp/hive</value>
    <description>Scratch space for Hive jobs</description>
  </property>
  <property>
    <name>hive.scratch.dir.permission</name>
    <value>777</value>
    <description>The permission for the user-specific scratch directories that get created in the root scratch directory </description>
  </property>

Answer 1

使用适当的 64 位winutils 并设置权限

winutils.exe chmod -R 777 \tmp\hive

 System.setProperty("hadoop.home.dir", "C:\\Users\\Hadoop_home")
  lazy val spark: SparkSession = {
    FileUtils.deleteDirectory(new File("c:\\tmp\\metastore_db"))
    FileUtils.deleteDirectory(new File("c:\\tmp\\spark-warehouse"))
    SparkSession.builder().config("spark.sql.warehouse.dir", "C:\\temp\\").master("local").appName("spark session for testing").enableHiveSupport().getOrCreate()
  }