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have been in touch with Hadoop for two years, during which there are many problems, both classic Namenode and jobtracker memory overflow failures, HDFs storage small file problems, both task scheduling problems and MapReduce performance problems. Some of these problems are the pitfalls of Hadoop itself (short boards), and others are improperly used. In the process of solving problems, sometimes need to turn over the source code, sometimes to colleagues, netizens consult, encounter complex problems will be through the mail list to users around the world Hadoop ...

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In this recipe you will set up DNS filtering to block access to bandwidth consuming websites.

In this recipe, you prevent users from receiving a security certificate warning when your FortiGate performs full SSL inspection on incoming traffic.

In this example, two company executives are excluded from the security scanning that a FortiGate applies to all other staff Internet traffic.

In the double 11 singles day scenario, a large-scale online service is built on the container using a large-scale operation and maintenance system, including a mixed deployment of business layers.

Enterprise operation and maintenance job interview: How to prevent the Linux server in the Trojan? (A) to answer the strategy to business interviews there are many competitors, so pay attention to the dimensions and height of the answer, we must immediately spike competitors, get high-paying offer. (B) Answer Tactics Trojans are often malicious Linux Under the way through the Web to upload the directory to upload Trojans to the Linux server, according to the malicious Web site to start -> Linux -> HTTP Services -> Middleware Services -> Program Code ...

For today's Internet age, the most popular is undoubtedly the mobile Internet, regardless of the developer or ordinary user, almost everyone is talking about it. The way that traditional Internet users are accustomed to accessing content and using services is rapidly changing by devices such as smartphones and tablets. As a provider of online content and services, we must get into this emerging market as soon as possible to learn new rules of the game. Having said that, the "mobile" approach will often find people can not find the North. What should I do? Develop an iPhone or Android application or website for a ...

(A) how to buy a virtual host, is to build a website novice one of the most frequently asked questions The following analysis will allow you to fully understand the current host market! The so-called virtual host (Virtual Host / Virtual Server), also known as virtual server or shared server, refers to the use of special hardware and software technology ,, in a server, the host can be virtual into 10, the same can be virtual into 100, and virtual host Each doubling of the number of placed ...

Preface Having been in contact with Hadoop for two years, I encountered a lot of problems during that time, including both classic NameNode and JobTracker memory overflow problems, as well as HDFS small file storage issues, both task scheduling and MapReduce performance issues. Some problems are Hadoop's own shortcomings (short board), while others are not used properly. In the process of solving the problem, sometimes need to turn the source code, and sometimes to colleagues, friends, encounter ...