在stackOverflow网站上看到这一提问,下文是部分摘抄问题简述: Java cluster, run task only once We have a java process, which listen's to a directory X on the file system using apache commons vfs. Whenever a new file is exported to this directory, our process kicks in. We fir…
网络结构 Ceph 使用以太网连接内部各存储节点以及连接 client 和集群.Ceph 推荐使用两个网络: 前端(北向)网络( a public (front-side) network):连接客户端和集群 The public network handles client traffic and communication with Ceph monitors. 后端/东西向网络 (a cluster (back-side) network):连接 Ceph 各存储节 The cluste…
小笔记: Mavon是一种项目管理工具,通过xml配置来设置项目信息. Mavon POM(project of model). Steps: 1. set up and configure the development environment. 2. writing your map and reduce functions and run them in local (standalone) mode from the command line or within your IDE. 3.…
Nimbus HA feature is quite important for our application running on the storm cluster. So, we've been working on the problem for some time and now a solution seems not that perfect but be enough to apply has comed out. Numbus的高性能特征对于运行在Storm上的应用来说是相当…
Query #1 is Version Info. SQL and OS Version information for current instance SELECT @@SERVERNAME AS [Server Name], @@VERSIONAS [SQL Server and OS Version Info]; Query #2 is Core Counts. Get socket, physical core and logical core count from the SQL S…
Stack Overflow网址:http://stackoverflow.com/ 当前访问量:每月9500PV(每天300多万PV) 当前Alexa排名:149 所用.NET技术:C#.Visual Studio 2010 Team Suite.ASP.NET 4.ASP.NET MVC 3.Razor.LINQ to SQL+raw SQL 下面是英文原文: A lot has happened since my first article on the Stack Overflow Ar…
https://cwiki.apache.org/confluence/display/FLINK/Flink+Internals Memory Management (Batch API) Introduction Memory management in Flink serves the purpose to control how much memory certain runtime operations use. The memory management is used for…
1.hadoop运行的原理? 2.mapreduce的原理? 3.HDFS存储的机制? 4.举一个简单的例子说明mapreduce是怎么来运行的 ? 5.面试的人给你出一些问题,让你用mapreduce来实现? 比如:现在有10个文件夹,每个文件夹都有1000000个url.现在让你找出top1000000url. 6.hadoop中Combiner的作用? Src: http://p-x1984.javaeye.com/blog/859843 Q1. Name the most common…
Using Sessions and Session Persistence The following sections describe how to set up and use sessions and session persistence: Overview of HTTP Sessions Setting Up Session Management Configuring Session Persistence Using URL Rewriting Instead of Cook…
hadoop面试题 Q1. Name the most common InputFormats defined in Hadoop? Which one is default ? Following 2 are most common InputFormats defined in Hadoop - TextInputFormat - KeyValueInputFormat - SequenceFileInputFormat Q2. What is the difference between …
airflow 1.10.0 官方:http://airflow.apache.org/ 一 简介 Airflow is a platform to programmatically author, schedule and monitor workflows. Use airflow to author workflows as directed acyclic graphs (DAGs) of tasks. The airflow scheduler executes your tasks…