1603: Scheduling the final examination Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 49  Solved: 15 Description For the most of the university students,what they most want is that they can obtain 60 points from the final examination of every subjec…

https://app.yinxiang.com/shard/s59/res/8a11b895-19b5-4ca1-aefe-10b5985b8af9/CSCC73 Final 17.pdf 自己尝试着做一下,没有对答案 目录 判断题 算了我就做判断题吧 判断题 a. √ 本来的贪心做法是总是在剩下的中选取[结束时间最早&&无冲突的] 或者,总是在剩下的中选取[开始时间最晚&&无冲突的] b. × 极端情形下,Huffman树很不平衡,codeword的长度可达到n-1 c…

应用属性 属性名 缺省值 意义 spark.app.name (none) The name of your application. This will appear in the UI and in log data. spark.master (none) The cluster manager to connect to. See the list ofallowed master URL’s. spark.executor.memory 512m Amount of memory to…

hive 2.3.4 on spark 2.4.0 Hive on Spark provides Hive with the ability to utilize Apache Spark as its execution engine. set hive.execution.engine=spark; 1 version Hive on Spark is only tested with a specific version of Spark, so a given version of Hi…

参考http://spark.apache.org/docs/latest/configuration.html Spark提供三个位置来配置系统: Spark属性控制大多数应用程序参数,可以使用SparkConf对象或通过Java系统属性进行设置. 可以使用环境变量通过conf/spark-env.sh每个节点上的脚本来设置每台机器的设置,例如IP地址. 日志记录可以通过配置log4j.properties. Spark属性控制大多数应用程序设置,并为每个应用程序单独配置.这些属性可以直接在一…

https://spark.apache.org/docs/latest/structured-streaming-programming-guide.html http://www.slideshare.net/databricks/a-deep-dive-into-structured-streaming   Structured Streaming is a scalable and fault-tolerant stream processing engine built on the…

什么是storm的并发度 一个topology(拓扑)在storm集群上最总是以executor和task的形式运行在suppervisor管理的worker节点上.而worker进程都是运行在jvm虚拟机上面的,每个拓扑都会被拆开多个组件分布式的运行在worker节点上. 1.worker 2.executor 3.task 这三个简单关系图: 一个worker工作进程运行一个拓扑的子集(其实就是拓扑的组件),每个组件的都会以executor(线程)在worker进程上执行,一个worker进…

Introduction Log files are files that contain messages about the system, including the kernel, services, and applications running on it. There are different log files for different information. For example, there is a default system log file, a log f…

前言 Apache Zeppelin是一款基于web的notebook(类似于ipython的notebook),支持交互式地数据分析,即一个Web笔记形式的交互式数据查询分析工具,可以在线用scala和SQL对数据进行查询分析并生成报表.原生就支持Spark.Scala.SQL .shell .markdown等.而且它是完全开源的,目前还处于Apache孵化阶段.其已经在各大公司均有采用,比如美团.微软等等. Zeppelin的后台数据引擎可以是Spark,也可以通过实现更多的解释器来为Ze…

Organize Your Train part II Time Limit: 1000MS Memory Limit: 65536K Description RJ Freight, a Japanese railroad company for freight operations has recently constructed exchange lines at Hazawa, Yokohama. The layout of the lines is shown in Figure 1.…