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While the term cloud computing is not new (Amazon started providing its cloud services in 2006), it has been a real buzzword since 2008, when cloud services from Google and Amazon gained public attention. Google's app engine enables users to build and host Web applications on Google's infrastructure. Together with S3,amazonweb services also includes elastic Cloud Compute (EC2) calculation ...

There is a concept of an abstract file system in Hadoop that has several different subclass implementations, one of which is the HDFS represented by the Distributedfilesystem class. In the 1.x version of Hadoop, HDFS has a namenode single point of failure, and it is designed for streaming data access to large files and is not suitable for random reads and writes to a large number of small files. This article explores the use of other storage systems, such as OpenStack Swift object storage, as ...

In the past few years, the innovative development of the open source world has elevated the productivity of Java™ developers to one level. Free tools, frameworks and solutions make up for once-scarce vacancies. The Apache CouchDB, which some people think is a WEB 2.0 database, is very promising. It's not difficult to master CouchDB, it's as simple as using a Web browser. This issue of Java open ...

Recently, Sohu Wuhan R & D Center, said its research and development of Sohu SendCloud triggered mail sending system, is about to use the DMARC security protocol to further ensure the safety of its mail. As a third-party mail sending service platform developed by Sohu Wuhan Center, it provides multiple interfaces to help developers and entrepreneurs complete the sending and tracking of mail. Sohu SendCloud is committed to providing users with a convenient trigger mail sending service to meet the needs of individual users and provide real-time data analysis, from the technical to effectively prevent ...

The previous article is about the table storage of Azure Service, this article is mainly aimed at the other kind of special storage-binary in azure, such as unstructured storage, if our Azure services need to save non-traditional or structured data, such as pictures, audio and video media, etc. Then we need to use the BLOB storage. 　　The Windows Azure platform provides a good hosting platform and programming model. Blob storage differs from Azure table storage in terms of concept, before we see table storage being the heaviest ...

Objective This article describes how to install, configure, and manage a meaningful Hadoop cluster, which can scale from small clusters of nodes to thousands of-node large clusters. If you want to install Hadoop on a single machine, you can find the details here. Prerequisites ensure that all required software is installed on each node in your cluster. Get the Hadoop package. Installing the Hadoop cluster typically extracts the installation software onto all the machines in the cluster. Usually, one machine in the cluster is designated as Namenode, and the other is different ...

One of the previous explorations was about the file system storage of azure services, we saw localstorage and ad hoc, and also in that article we covered two more important models and roles in the Azure programming model, WEB role and worker 　　Role, to understand the relationship between the web and the worker, is the key to using and mastering queue storage. According to the official MSDN definition: Web role:a Web Role I.