error: # ./spark-shell Caused by: javax.jdo.JDOFatalDataStoreException: Unable to open a test connection to the given database. JDBC url = jdbc:mysql://sd-9c1f-2eac:3306/hive?createDatabaseIfNotExist=true, username = hive. Terminating connection pool…
Scala中没有静态类型,但是有有“伴侣对象”,起到类似的作用. Scala中类对象中不可有静态变量和静态方法,但是提供了“伴侣对象”的功能:在和类的同一个文件中定义同名的Object对象:(须在同一文件中:main方法定义在Object对象中) private[spark] class Client( val args: ClientArguments, val hadoopConf: Configuration, val sparkConf: SparkConf) extends Loggi…
tpc 官方:http://www.tpc.org/ 一 简介 The TPC is a non-profit corporation founded to define transaction processing and database benchmarks and to disseminate objective, verifiable TPC performance data to the industry. TPC(The Transaction Processing Perform…