Programmer Think

Disadvantages of traditional methods: The traditional web interaction is that the user triggers an http request server, and after the server receives it, it responds to the user and returns a new page. Whenever the server processes the request submitted by the client, the client can only wait idly, and even if it is only a small interaction and ...

Bootstrap initialization process netty's client boot class is Bootstrap. Let's take a look at the initialization process of Bootstrap in the client part of spark's rpc. TransportClientFactory.createClient(InetSocketAddress address) Simply post out the Bootstrap initialization code // Client boot object Bootstrap bootstrap = new Bootstrap(); // ...

In planning tasks, you will occasionally see repetitive execution: Examples of our company's planned tasks are as follows: */2 * * * * root cd /opt/xxxx/test_S1/html/xxxx/admin; php index.php task testOne >/dev/null 2>&1 */2 * * * * root cd /opt/xxxx/test_S1/html/xxxx/admin; php index.php task testTwo >/dev/null 2>&1 This ...

Last article In this article, we will further understand the common methods of google benchmark. Index of this article Passing parameters to test cases Simplify the generation of multiple similar test cases Using parameter generator Passing parameters to test cases Previously, all our test cases accepted only one benchmark:: S ...

Based on jquery file upload control, support ajax refreshless upload, multiple files upload at the same time, upload progress display, delete uploaded files. JQuery 1.4 or above, flash player 9.0.24 or above are required. There are two versions, one is flash and the other is HTML 5. HTML 5 pays ~so here's just the flash version 1. js ...

Python Data Type and Its Method When we learn programming languages, we will encounter data types, which are very basic and inconspicuous, but it is very important. This paper introduces python's data types, and gives a detailed description of the methods of each data type, which can be used for knowledge review. I. Integration and Long Integra ...

Last month, my teacher asked me to build Docker's OSM server. At that time, I stepped on the pit while recording. Finally, I got the deployment, so I blogged. I. Install and configure Docker This section describes the installation steps of docker in centOS 7 environment. The content is from http://www.runoob.com/docker/docker-tutorial.html Fo ...

MySQL Analysis of Abrted Alert Logactual combatPart1: Write at the topIn the error log of MySQL, we often see some kinds of borted connection errors, this article will make a preliminary analysis of such errors, and understand the basic ideas and methods of investigation after a problem arises. It's important to master this method, not to have ...

Definition of heap Must be a complete binary tree (except for the last layer, each node has two sub-nodes, the last layer can only be missing several right nodes) The value of each node in the heap must be >= (large top heap) or <= (small top heap) about the value of the subtree node. Relations of nodes in heap The parent node whose su ...

Shuffle Output Tracker As an auxiliary component of shuffle, this component plays an important role in the whole shuffle module. In the previous series of analyses, we mentioned this component more or less. For example, when DAGScheduler submits a stage, it encapsulates the stage as a TaskSet, but the possible partitions have been computed and ...