The C++ data open platform is actually in practice, and teaches you to do industrial-grade projects step by step.
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The C++ data open platform is a practical experience, teaching you the essence of the http protocol for industrial-grade projects.
The HTTP protocol is built on top of the TCP IP protocol and is a client-side and server-side request and response standard (TCP). The client is the end user, and the server is **. Using a web browser, web crawler, or other tool, the client initiates an HTTP request to the server on a specified port (default port is 80).
HTTP is a protocol that belongs to the application layer, and it is designed for communication between web browsers and web servers, and can also be used for other purposes.
HTTP follows the classic client-server model, where the client opens a connection to make a request and then waits for it to receive a server-side response.
HTTP is a stateless protocol, meaning that the server does not retain any data (state) between two requests. Although typically based on the TCP IP layer, it can be used on any reliable transport layer; That is, a protocol that doesn't silently lose messages, such as UDP. Requests are usually initiated by a recipient like a browser.
A complete web document is usually made up of different sub-documents, such as text, layout descriptions, scripts, and so on.
Generally speaking, it is the rules for computers to communicate through the network, which is a request-and-response, stateless, application-layer protocol, often based on the TCP IP protocol to transmit data. At present, any kind of communication between any terminal (mobile phone, laptop) must be carried out according to the HTTP protocol, otherwise it cannot be connected.
HDFS deficiency
Extensibility of metadata:namenode is a metadata service node and a cluster management node, and the metadata of the file system and the block location relationship are all in memory. Namenodes have very high memory requirements, and machines with large memory need to be customized, and the memory size also limits the scalability of the cluster.
Global Lock:The namenode has an FSNAMEsystem global lock that is added every metadata request. Although the reads and writes are separated, and some processes optimize the holding range of the lock, it is still a big problem.
Block Debriefing Storm:The default block size of HDFS is 128 MB, and when starting a cluster with hundreds of petabytes of data, the NameNode needs to accept all block reports before exiting the safe mode, so the startup time will be several hours.
Without a doubt, object storage is the best solution.
The type of technology you use with structured and unstructured data depends on the type of data storage you're using. Typically, structured data stores provide in-database analytics, while unstructured data stores don't. This is because structured data follows known and repeatable rules of operation due to the format it employs, while the format of unstructured data is more diverse and complex.
Both types of data can be analyzed using a variety of techniques. Querying data using Structured Query Language (SQL) is the fundamental foundation of structured data analysis. Other techniques and tools can be applied, such as data visualization and modeling, programmatic manipulation, and machine learning (ML).
For unstructured data, analytics often involves more complex programming operations and machine learning. These analyses can be accessed through a variety of programming language libraries and specialized design tools using artificial intelligence (AI). Often, unstructured data needs to be pre-processed to fit into a particular format.