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This article is my second time reading Hadoop 0.20.2 notes, encountered many problems in the reading process, and ultimately through a variety of ways to solve most of the. 　　Hadoop the whole system is well designed, the source code is worth learning distributed students read, will be all notes one by one post, hope to facilitate reading Hadoop source code, less detours. 1 serialization core Technology The objectwritable in 0.20.2 version Hadoop supports the following types of data format serialization: Data type examples say ...

There is no road in the world, and the people who walk more and more become the way. 　　Why not build a mongodb on http://www.aliyun.com/zixun/aggregation/14171.html ">postgres"?  The Postgres community did not sit on the NoSQL after taking a series of actions.  Postgres has been progressing: integrating JSON and PLV8. PLV8 introduce ...

PKGTXT2DB is a utility that is applied to the Slackware and Slackware base operating systems. It converts PACKAGES.TXT to multiple database formats. The current version supports CSV and JSON. Pkgtxt2db 0.1.4 This version adds pkgdesc to CSV DB, adds separator to CSV (for MySQL input security), removes garbage from Slackware DB output, fixes a pkgdesc line Var, and adds/outputs an example ...

Several years of work down, also used several kinds of database, accurate point is "database management system", relational database, there are nosql. Relational database: 1.MySQL: Open source, high performance, low cost, high reliability (these features tend to make him the preferred database for many companies and projects), for a large scale Web application, we are familiar with such as Wikipedia, Google, and Facebook are the use of MySQL. But the current Oracle takeover of MySQL may give us the prospect of using MySQL for free ...

HBase terms in this article: column-oriented: Row column Group: Column families Column: Column unit: Cell Understanding HBase (an Open-source Google bigtable practical application) The biggest difficulty is what is HBase's data structure concept? First HBase is different from the general relational database, which is a database suitable for unstructured data storage. Another difference is that HBase is based on columns rather than on rows. Goo ...

Editorial Staff Note: This article is written by Amit Apple, a software developer for the Windows Azure Web site team. If you want to understand and personally participate in computing resource management, you'll be glad to hear that the Windows Azure Web site now offers some very useful online tools to help you do something extraordinary. These tools have been integrated into your site's Kudu dashboard (also known as the Web Site control management (SCM) dashboard), and now let's look at these tools together. ...

RSPAMD is an anti-http://www.aliyun.com/zixun/aggregation/12915.html "> Spam system, which works by using quality event models and regular expressions, Make the work speed is about 10 times times faster than SpamAssassin. Its functions include: filtering regexp rule messages in different parts, analyzing a series of built-in features of messages, supporting fuzzy hashes, SURBL filters, email and character sheets, remote control Interface management, and statistical funding ...