Let’s take a couple of pictures and see how the cat is Siam? Which cat is short?
In general, the employee will leave the job within one month and leave the company for half a year. The reasons for the departure will be different for two years or more.
A month out, usually can’t adapt to the job or related to the work itself.
The situation of half a year, general and direct superior concerned.
More than 2 years left, basically belong to the recognition company, but the development is limited
In fact, the retention of the product is similar to that of the employee, and the reasons for the short-term retention, interim retention and long-term retention are very different.
Apache Ambari project by developing software is the purpose of the hadoop cluster configuration, monitoring and management, in order to make the management more simple hadoop.Ambari also provides a RESTful interface implementation based on itself of intuitive, easy-to-use web management interface.
Ambari allows system administrators to the following:
1. Provide installation management hadoop cluster;
2. Monitor a hadoop cluster;
3. The extension ambari custom service management functions.
With the advent of the era of big data, data mining has become more and more important.Front end point buried as a more mature data access method is widely used.Currently buried point is divided into two ways, and will come with no points.Sets a buried point is easy to understand, is called the SDK API, in the code inserts buried point related code, user behavior acquisition.Because we are in development projects, buried point are manually, every business needs change to buried point everywhere, and no burial code, which does not need to be manually inserted into the code, just prior to related configuration, the SDK automatically collect user behavior, avoided because of the change of demand, and buried the great degree error causes such as to bury some heavy and complicated work.This paper mainly introduces the technical implementation of codeless capture technology.
In recent years, data analysis has developed rapidly and we have also made a micro data analysis tool.The product has been successfully operated for three years, fulfilling the daily life of millions of enterprises.The product structure is very simple, with the simplest language in the world PHP, the most common database mysql, the server can choose apache or choose nginx, all your own preferences.
What is Apache NiFi? NiFi’s website explains: “an easy-to-use, powerful, reliable data processing and distribution system.” Popular, namely the Apache NiFi is an easy to use, powerful and reliable data processing and distribution system, its designed for the data stream, it supports highly configurable indicator diagram of data routing, transformation and mediation logic system.
To NiFi can describe more clearly, through NiFi architecture to do a brief introduction to below, as shown in the figure below.
Since we learned about a distributed framework (dubbo), which involved zookeeper, let’s start with a brief introduction to zookeeper.Zookeeper is a distributed coordination service that manages a large number of hosts.
Distributed applications can perform specific tasks by coordinating them between them, and a fast and effective way of running networks across multiple systems at a given time (and at the same time)
Distributed applications have two parts: the server and the client application.As shown in the figure below:
The Activiti framework is one of the workflow frameworks that have developed rapidly in recent years with its open source features.Another workflow framework, JBPM5, is currently a very popular workflow framework.While these two frameworks are two different companies, the two frameworks have a lot to do with it.Tom Baeyens, the director of the Activiti workflow framework, has previously worked for jBoss, currently the publisher of JBPM5, as the chief architect of the previous JBPM4 workflow engine.But it was speculated that Tom Baeyens left jBoss to work for Alfresco because of internal contradictions within jBoss and a serious disagreement over the future version of the workflow engine.However, for months, Tom Baeyens has launched Activiti, an open-source workflow system based on the JBPM4 workflow engine.
RPC（Remote Procedure Call Protocol）——远程过程调用协议，它是一种通过网络从远程计算机程序上请求服务，而不需要了解底层网络技术的协议。