July 30
Data storage: Disk (shared) 1, SAN NAS DAS (the specialized data stored in the disk array)
2, distributed storage architecture (. HDFS: hodoop defined file system used for mass data storage) - Cluster (application)
System: Linux
Algorithm: 1, map-reduces data processing clusters: It is the data in a certain way, to modify the relationship between the key (key-value) HDFS + map-reduces = Hadoop cluster (running on a high-performance Linux cluster's)
2, through the mathematical (statistical) + Python
Cloud computing - Big Data
Development - computer language
BASIC early machine language
C C ++: systems development, driver development, embedded development (writing board)
(Driver: a set of instructions need to convert between the various equipment manufacturers make interworking between equipment manufacturers.)
Front-end: JS Php css html
JAVA
Tools: scripting language -shell \ perl \ python
Database: MySQL, nosql
Operating System Introduction
1, the operating system doing? - Platform (nexus: - Down Application - a hardware device (resource))
Three member hardware platforms: CPU Memory 1 / O device
(Operator controller memory, input devices output device)
CPU: All operations
Memory; providing data (CPU can only read data to the memory) data to restart the system memory will be lost CPU reads memory specified (required data) of this process, we are called to address (physical address logical address) to the CPU
IO device: network card (adapter adapter): Ethernet (enternet)
Disk (IDE, SAS, SSD) mechanical drive, solid state disk
Knowledge expansion:
Osi seven layer model --- TCP / IP four-layer model
The application layer -QQ | application layer
Presentation layer - Conversion instructions |
-Session session layer establishes a session |
The transport layer - distinguished by the application port | transport layer
Network layer -IP | network layer
The data link layer -MAC address | host-to-host layer
Physical layer: the specific physical device (a hardware device) tangible
(Lower for the upper layer to provide services)
The operating system itself is a software program, but he does not directly provide customers with the application, but to provide hardware resources for other applications; the operating system is divided: user space and kernel space