In recent years, with the rapid development of big data technology, users are more and more inclined to solve the problems of large amount of data and complex business scenarios with big data platform. When the system is faced with the scene of data hotspot and frequent data modification, it will produce a lot of useless data and cause data hotspot problems, which make a lot of access to the level of disk storage. Unreasonable data allocation of HFile will affect I/O performance and reduce system availability. This thesis proposes a comparison strategy based hot data. According to the frequency of data access, this stategy change the selection method of merging subsequence of Exploring Compaction Policy, so as to achieve a more suitable effect for hot data query business.
Information security has gone beyond the traditional scope of information communication and media, become the key related to the core interests of China's national security, social stability and personal privacy, etc. Establishment of a comprehensive network and information security management system has become the urgent priority, thus accelerating the legislation of network and information security in our country is pressing. The purpose of the legislation of network and information security in our country should lie in combating the threats from network information security, promoting the industrial development, safeguarding national security and social stability, and protecting the legitimate interests and rights of related parties. We should take the "information security" as the object of legislation, "the overall national security concept" as the concept to guide the stipulation of comprehensive legislation, and build the trinity frame of the network and information security management legal system featuring "defense, control and punishment". At present, China's national security and social stability face unprecedented information security threats. February 27, 2014 Central Network Security and Information Leading Group was formally established, indicating that China will enhance the network security up to the height of national security, and the establishment of a comprehensive network and information security management system has become the urgent priority. Legal governance is one of the important components of network and information security governance,with the force of law it maintains the normal order of the network space and safeguards the security of national critical information infrastructure. The National People's Congress has put the network safety into their legislation plans in 2014. Some researchers proposed building a legal system of network and information security governance with the harmful information management as the core, there are also some researchers considered building a legal system of network and information security governance from the perspective of criminal law. This text discusses the legislation orientation problem of China"s network and information security from the perspective of concept interpretation, legal governance and governance system. Concept Interpretation: the relationship between information security and network security In China, the concept and use of information security, network security has always been controversial. From the actual use, information security, English as "Information security", has been widely used in existing policies and legislation documents at home and abroad; network security, has developed to be the meaning of "cyberspace security" (English as "Cyberspace security" or Cybersecurity") 1from a purely technical terms (English as "Network security")1,the use of it witnesses a huge increase in the new policy and legislation documents at home and abroad. Some
The appearance characteristics of numerical control presses were quantitatively evaluated using eye-tracking technology, and a numerical control press design method was proposed to provide guidance for the design of such mechanical products. By investigating and analyzing the appearance of numerical control presses locally and abroad, the modeling characteristics of these products are summarized. The interest areas of the press are divided using the hot zone map data of the eye movement experiment, and people’s knowledge of each area of the press is quantitatively analyzed. Data generated by multiple eye movement experiments are combined with a subjective questionnaire to identify the mechanics of the press. The front and work areas are the main features of the press design. Based on the experiment result, the press design is conducted based on color and modeling elements. We used the Jiangsu CPTEK numerical control press as the actual case. We also re-matched the color, optimized the details, and developed an improved design scheme, thus verifying the proposed design method.
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