Mail Delivery Agent
The main function of MDA is to place the letter received by the MTA into the mail file under the local account according to the flow of the mail, or send the mail to the next MTA through the MTA. If the flow of mail is to this machine, its function is to put the mails sent by the MTA into each user's inbox, and also to perform mail filtering.
Mail Exchange mail routing
The MX record points to a mail server. Users can point the domain name to their mail server in the MX record, and then they can control all the mailbox settings by themselves. For example, when a user on the Internet sends a letter to user @ domain, the user's mail system looks up the MX record for the domain name through DNS. If the MX record exists, the user's computer sends the message to the MX record Mail server.
Mail Transfer Agent
The MTA is responsible for passing mail from one server to another server or mail delivery agent.
Mail User Agent
MUA is an email client. It receives emails from mail hosts and provides users with the ability to browse and compose emails. Common MUAs are Foxmail, Outlook, etc.
It is a programming model for Hadoop processing data. It is usually used for parallel operations on large-scale data sets (>1T). The programming idea is to divide the data processing methods into "Map" and "Reduce". The Map function first operates on a large-scale data set and distributes it to a master sub-node managed by a slave master node to complete it together. Then use the Reduce function to integrate the intermediate results of each node to get the final calculation result.
It is a type of job input for Hadoop to perform data processing. Hadoop is written by a JAVA program, so by default, jobs are packaged into a Jar format for processing by default.
Master is a role in the BMR cluster. It is mainly responsible for managing the execution of distributed data and decomposition tasks. Only one machine in each cluster plays the role of master.
With pipelines, users have more flexibility in managing transcoding tasks. When a user creates a task, the user must specify the pipeline to which the task belongs.
A preset is a preset set of definitions required for a video resource to perform transcoding calculations. Users can more easily apply a preset to one or more video transcoding tasks, so that these tasks output target video resources of the same specifications.
Job is the most basic execution unit in audio and video transcoding. Each job transcodes an original audio and video resource into a target audio and video resource. Therefore, there is a one-to-one correspondence between jobs and transcoding goals, that is, if the user needs to convert an original video specification into three target specifications, such as transcoding from AVI format to FLV/MP4/HLS format, then the user needs to create three jobs.
Take one or more frames from the original video, and generate pictures according to the size and scaling strategy specified by the user to meet the needs of video preview and special frame extraction.
MCT audio and video transcoding
MCT (Multimedia Cloud Transcoder), combined with Baidu AI Cloud Platform, provides developers and enterprise users with audio and video storage, transcoding, CDN acceleration, multi-end secure player (Web/Android/iOS), DRM (Digital Rights Management) digital rights management services.
It is an open source high performance distributed cache system. Its official definition is as follows: Free&open source, high-performance, distributed memory object caching system.
Modbus communication protocol
Modbus protocol is a universal language applied to electronic controllers. Through this protocol, the controllers can communicate with each other, the controller via a network (such as Ethernet), and other devices. Through Modbus, control equipment produced by different manufacturers can be connected to an industrial network for centralized monitoring.
Modbus protocol mode
"The IoT Hub supports 3 modes according to the Modbus protocol, i.e. TCP, RTU, and ASCII. Currently, IoT Paser supports both TCP and RTU modes.
- TCP mode: Modbus master and slave communicate via TCP protocol.
- RTU mode: Modbus master and slave are connected through serial ports, such as RS232, RS485. The data in the data packet is in binary format without any encoding, and the transmission efficiency is the highest.
- ASCII mode: Modbus master and slave are connected through serial ports, such as RS232, RS485. The data in the data packet is ASCII encoded binary data, each byte is encoded into 2 characters. For example, byte 0x4f will be encoded into '4f' 2 characters for transmission. The transmission efficiency is relatively low compared to RTU. The advantage is that readable data can be monitored on the transmission line. "
Baidu AI Cloud MongoDB product is 100% compatible with the industry's MongoDB protocol. It provides highly reliable, highly flexible, and operation-free cloud-based document database services for customers on the cloud, including finance, games, and e-commerce.
MQTT is a protocol based on the Publish/Subscribe mode of binary messages. It was first proposed by IBM, and has now become the OASIS specification, which is more in line with M2M large-scale communication.
MIME Versatile Internet Mail Extension
MIME is a multipurpose Internet mail extension protocol. It extends the basic text-oriented Internet mail system, and realizes the function of transmitting non-text (binary) data using standard text format mail without changing the existing mail protocol. The server tells the browser the MIME type of the multimedia data in the message, so that the browser can read the file through the corresponding plug-in.
The video objects that VOD mainly manages are called media assets.
Key management service KMS
The Key Management Service (KMS for short) is a key management service provided by Baidu AI Cloud, and you can manage the key information on the cloud conveniently, safely and reliably through such service. The user can be freed from the implementation of complicated key device management and security mechanism, and only needs to focus on the encryption and decryption function scenarios at the top of the business.
The scope refers to the visual range of monitoring items. The monitoring items of different scopes are completely isolated from each other, so there will be no conflict. Generally, the monitoring items of different applications are placed in different Scopes. Wherever an item is used, the designation of the scope must be added.
PresetID is a required request parameter when calling API or SDK for SMS delivery. In other words, when users use this preset to send SMS, they must use the corresponding preset ID parameter.