how to log calculations

Preface This is a study note.The learning material comes from a log blog post from Jay Kreps.The original text is very long, but I persisted to read, the harvest is very much, also deeply to Jay's technical ability, the architecture ability and to

Preface This is a study note.The learning material comes from a log blog post from Jay Kreps.The original text is very long, but I persisted to read, the harvest is very much, also deeply to Jay's technical ability, the architecture ability and to

PrefaceThis is a study note.The learning material comes from a log blog post by Jay Kreps.The original text is very long, but I insist on reading, harvest a lot, but also deeply for Jay Brother's technical ability, architectural ability and

Reprint: http://www.cnblogs.com/sharpxiajun/p/5205496.htmlRecently made a small MapReduce program, the main purpose is to calculate the highest value of the top 5, originally intended to use spark calculation, but I am now just a simple look at

Assignments and operations in the shell are string-handling by default.1) Use let (integer only)Var=1Let "Var+=1"Echo $varOutput is 2Attention:A) Let almost all operators are supportedb) Power operation should use "* *"c) parameters are accessed

Log data is the most common kind of massive data, in order to have a large number of user groups of e-commerce platform, for example, during the 11 major promotion activities, they may be an hourly number of logs to tens of billions of dollars, the

MySQL has 4 different logs, namely, binary log, query log, slow query log and error log, these diaries record all aspects of database work, can help us understand the different aspects of the database traces, the following first describes the role

The MySQL two log is used to record changes to the database, which is structured to discuss the format of the log. Each log contains 4 bytes of magic number and event description package Log has the first four bytes is Magic number:oxfe ox62 0x69 0

(This article is no longer syncing updates, see GitHub for the latest code)Log analysis plays a very important role in the troubleshooting and performance analysis of web systems. At present, the open source Elk system is a mature and powerful

Basic introductionProgram developers often have to analyze the program log, including their own print logs and other software used to print the log, such as Php,nginx logs, Linux environment analysis logs have some built-in commands to use, such as