backlog refinement

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What is product backlog and sprint backlog?

Product Backlog refers to the list of tasks that are decomposed according to initial requirements, including all functional and non-functional functions. The product owner determines the priority level for the tasks in product backlog, when a development team starts a task, it precisely defines and breaks down the task. Product backlog is the general outline o

What is a product backlog and what is a sprint backlog?

A product backlog is a list of tasks that are broken down according to the initial requirements, including all functionality that is functional and non-functional, prioritized by the product owner for the task in the product backlog, and when the development team starts a task, the task is precisely defined and decomposed.The product backlog is the master of all

What the backlog means in the python]socket.listen [backlog]

http://www.nosa.me/2015/09/16/socket-listenbacklog-%E4%B8%AD-backlog-%E6%8C%87%E7%9A%84%E6%98%AF%E4%BB%80%E4%B9%88/The backlog represents the number of connections that have been established but not taken away by the accept.In addition, a kernel parameter net.core.somaxconn defines the maximum number of connections that the socket listen, so the value specified by Socket.listen () cannot exceed net.core.som

About the backlog grooming activities

refinement, estimation, and prioritization of the stories that might be included in the sprint before the next sprint begins.WHO participates in backlog grooming activities?PO, SM, and team should all be involved, and SM is the organizer of the event.When do I start a backlog grooming campaign?In this sprint, complete the ba

C # image refinement: Hilditch refinement Algorithm

Theory: To refine the algorithm, perform the following steps: Iteration of each pixel from left to right from top to down is an iteration cycle. In each iteration cycle, if each pixel P meets six conditions at the same time, it is marked. At the end of the current iteration cycle, the values of all marked pixels are set as background values. If a tag does not exist in an iteration cycle (that is, pixels that meet six conditions), the algorithm ends. If the background value is 0 and the foregroun

How the "translate" TCP backlog works in Linux

Original how TCP backlog works in LinuxThe level is limited, inevitably mistake, welcome to point out!The following are translations:When an application listen a socket (socket) to the listen state through a system call, a backlog parameter is specified for the socket, which is typically described as the length of the connection queue to limit incoming (queue of incoming connections).Because of the three-ti

Analysis of the backlog of TCP connection listen

In a TCP connection, the most important is the connection of the TCP connection, the state between the two directions and the relationship between each system call and the state. Can often be expressed in two graphs, the first is the state transition diagram, the second is the connection sequence diagram. As follows: State diagram: Time series diagram: Visible, the Listen state is the only way to establish a server receiving connection. When listen is called, the server enters the listen state.L

Kernel Listen backlog and simple three-time handshake analysis

1. Background:In front of the listen backlog to the full connection and the impact of semi-connection, this article will be from the kernel source (kernel 2.6.32) Simple understanding of the service side of the three-time handshake and the backlog in the middle of the role.2. Three-time handshake:2.1 Service-Side monitoring:After System_call, through the FD number to obtain the corresponding socket, and the

The backlog in Linux is detailed

Speaking of the backlog, you will remember the listen backlog parameter in socket programming, which is the backlog that is processed in the Linux kernel?int listen (int sockfd, int backlog)Mans ListenYou can see an explanation about listen. THENBSP; backlog argument defin

How to do demand management and planning with Leangoo? (Product backlog, user stories)

tester, and the common goal is to translate the requirements into the functionality that the customer really needs, rather than one-way task delivery, through discussion, collaboration, and understanding of the requirements. It takes a lot of time to compile detailed and accurate requirements documents, and if the requirements change frequently, the maintenance costs are higher. Agile uses the product backlog to manage demand, and the produc

User story-driven agile development –2. Create a backlog

The first article in this series, "User story-driven agile development –1." Planning chapter "To share with you how to use user stories to help teams create requirements, in this article, we look at how to use these user stories and feature points to form a product backlog." A product backlog is a tool that is used in agile development to manage requirements lists, prioritize, form iteration plans, and orga

Concurrency capability of asynchronous IO: The backlog configuration is important

When I was about to finish at noon today, I found a problem that was maddening.A lite AIO application should theoretically be more concurrent than a full version of the AIO application (because the full version of the transaction is more complex) and tested on the same machine.However, the test results show that the concurrency of the lite version is less than the full version of the AIO application.It took one hours to finally find the reason: the original

The meaning of the backlog parameter in the TCP/IP protocol listen function and the PHP-FPM 502 bad Gateway

To understand the backlog argument, we must realize, a given listening socket, the kernel maintains the queues:To understand the meaning of the backlog parameter, we must understand that for a listening socket,kernel maintainer two queues:1.An Incomplete connection queue, which contains an entry for each SYN that have arrived from a client for which the server Is awaiting completion of the TCP Three-way han

Backlog parameters and SYN flood attacks

In Linux network programming, using the Listen function to listen to sockets, the use of Man in Linux, the 2nd parameter is explained as follows: The backlog argument defines the maximum length to which the queue of pending connections for SOCKFD may grow. If a connection request arrives when the queue was full and the client may receive a error with an indication of Econnrefus ED or, if the underlying protocol supports retransmission, the re

Java Socket parameters: backlog

The maximum queue length of the input connection indication (for connection requests) is set to the backlog parameter. If the queue is full, the connection is rejected.Note:1. The backlog parameter must be a positive value greater than 0. If the passed value is equal to or less than 0, it is assumed to be the default value.2. After testing, this queue follows the FIFO principle.3. If you place the accept fu

The meaning of the backlog in the socket listen parameter!

when the server listens, it takes a certain amount of time to process a client's connection each time, which is very short (perhaps only 1ms or less), but this time still exists. The meaning of this backlog is that while the first connection request is being processed during this time, other connection requests are waiting in the request queue, and if the queue's maximum number of waits is exceeded, the other requests are ignored or will not be proces

The meaning of the backlog within the listen function and the various situations

gives some values for the coefficients:Queue Length for different backlogThe system maintains a fixed-length connection queue for the TCP service program that is waiting for a connection request. The connection in this queue has been received by TCP (the handshake has been completed three times), but it has not been received by the application (call the Accept function)The situation of LinuxThe comments in the first article say that this is the BSD situation , which is not the case in Linux . I

Analysis and setting of backlog in TCP/IP protocol and changes of TCP status

In the TCP/IP protocol, backlog analysis and settings, and TCP status changes. In the TCP/IP protocol, the first section describes how to set the backlog value. What is this value? We all know that TCP requires three-way handshake when establishing a connection. But if the three-way handshake is complete, the server will handle it (accept). If not, what will happen, if the accept is not timely, the client w

The listen parameter backlog of the socket function in Linux

After some hard work, I will summarize it.ListenParametersBacklog. PS: server environment:Ubuntu12.04. Client does not matter: IMac OS X 10.7. Let's take a look at $ man listen, which contains a passage: If the backlog argument is greater than the value in/Proc/sys/NET/CORE/somaxconn, Then itIs silently truncated to that value; the default value in this file is 128. In kernelsBefore 2.4.25, this limit was a hard coded value, somaxconn, with the

TCP/IP Backlog

In Linux, when an app creates a socket in the listen state, it assigns two queues to the socket. SYN queue: Holds the socket in the SYN_REC state, specified by the kernel parameter tcp_max_syn_backlog. Accept queue: Stores the socket in the established state, specified by the kernel parameter Somaxconn and the application itself, such as: Redis:tcp-backlog, take the minimum value in Somaxconn and Tcp-back

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