Get partitions and cores Use an rdd method to get the number of DataFrame partitions df = spark.read.parquet(eventsPath)
df.rdd.getNumPartitions() Access SparkContext through SparkSession to get the number of cores or slots SparkContext is also provi...
--删除表空间 drop tablespace nacos including contents and datafiles ----创建表空间并定义路径 create ?tablespace nacos --表空间名 datafile 'D:/app/Administrator/oradata/nacos/nacos.dbf'? size 500m ?--大小初始值 autoextend on ?--自动扩展 next 50m m...
Spark 数据类型 Data Types Spark SQL and DataFrames support the following data types: Numeric types ByteType: Represents 1-byte signed integer numbers. The range of numbers is from?-128?to?127. ShortType: Represents 2-byte signed integer numbers. The rang...
Error Messages to Fear 参考地址:Introduction Hadoop and Kerberos: The Madness Beyond the Gate Security error messages appear to take pride in providing limited information. In particular, they are usually some generic IOException wrapping a gener...
文章目录 问题1: Could not get job jar and dependencies from JAR file: JAR file does not exist: -yn 原因:flink1.8版本之后已弃用该参数,ResourceManager将自动启动所需的尽可能多的容器,以满足作业请求的并行性。解决方法:去掉即可...
一.元组(Tuples and Case Classes ) 对java来说Tuples是flink自带的一种类, 对于scala来说flink没有提供类似Tuples的类, 因为scala天生自带了一种特殊类 case class. 主要说说java版的Tuples, Java API 提供从Tuple1最高到Tuple25. 元组的每个字段都可以是任意 Flink 类型,...