wavelink avalanche

Cool routine of yizaki III, coolSource: https://biancheng.love/contest-ng/index.html#/34/problemsquestion description When there is a lot of free time, I like to play some very time-consuming games, such as I wanna, which can be killed thousands of times. If I'm not careful, I need to start over again. When a domino card is placed, an avalanche will occur if you hit it halfway. For example11__ 1x11_11In this shape, the person who is so dead will certa

existing test conditions, Linux GCC 4.4 selects some common applications as test items and classifies them into two categories: desktop and network. The desktop includes three applications: virus detection, compression and packaging, and audio encoding. The time required to complete the task is considered; the Network Department builds a complete LAMPLinux/Apache/MySQL/PHP service in different system environments, test the maximum number of new transactions per second in different test cases us

such a large amount of stress and downtime, resulting in the entire site is not available. This is known as a cache avalanche, where this failure occurs, or even simply restarting the cache server and the database server to restore site access. Workaround: 1, cache hot standby (when a server goes down, cache access is switched to the hot standby server.) ); 2, cache server cluster . cache warm-up. the cache is the hotspot data, the hot data is th

streaming) only for the evaluation of transmission, opened my audio and video facilities, tacit consent is the configuration of the service device to initialize the facility (such as sampling rate, video frame rate, Frequency of audio sampling, etc.)2, require other users of the audio and videoIf the demand shows other users of the audio and video, it is necessary to receive the room user list information, demand for the side of the audio and video stream, and then for just the sound as good ne

is a public key (Public Key), a public key is encrypted, and the private key is decrypted. One-way encryption: it also becomes hash encryption. The ciphertext can be obtained from the data. Otherwise, the data cannot be obtained from the ciphertext. Extract data signatures. Each Data signature is unique and can be used for data verification to verify whether the data is damaged. Calculate the signature of a file. md5sum can be used. Example: [[Email protected] TMP] # md5sum issue protected issu

has a very high "Matthew effect"-at least a higher "Matthew effect" than the "Humanistic sentiment" business ", because "classification information" has lower demand elasticity than "Humanistic and emotional information. This is very understandable. Let me give you an example of daily life: We need to find a shared rent information. If a website may be found, I can go to that website to make it sufficient; if I want to watch an online novel, I will go to another website to view several pieces o

; 1 W), T-semiconductor Thyristor (controllable rectifier), Y-Body Effect Device, B-Avalanche tube, J-step recovery tube, CS-field effect tube, BT-semiconductor special device, FH-composite tube, pin-pin tube, JG-laser device. Part 4: number representation Part 5: Use Chinese pinyin letters to indicate the specification number For example, 3dg18 indicates a high-frequency transistor of type silicon material. Japan Semiconductor Discrete Device Model n

The usage of redis is divided into two points: PerformanceAs shown in, running SQL statements that take a long time and do not frequently change results are especially suitable for caching the running results. In this way, the subsequent requests are read in the cache so that the request canRapid response. ConcurrencyIn the case of high concurrency, all requests directly access the database, and a connection exception occurs in the database. At this time, you need to use redis for a buffer oper

concentrated on the B server, then the load of B is much higher than the other servers. That's the problem with hot data. At this point we can add servers to the UID space where B is located, reducing the pressure on B.In fact, there is a better solution: virtual node.The above-mentioned situation is that the real server is hashed on 232 as a node. We assume that only 4 servers (such as), and then a above the hot data, the result of a hang up, and then do data recovery, a data migration to B, t

tolerance 857.1.1 Avalanche Effect 857.1.2 how to fault tolerance 867.2 Using Hystrix for fault tolerance 887.2.1 Hystrix Introduction 887.2.2 Universal Way Integration Hystrix 89Condition monitoring and in-depth understanding of 7.2.3 Hystrix Circuit Breaker 917.2.4 Hystrix thread Isolation policy and propagation context 937.2.5 Feign using Hystrix 96Monitoring of 7.3 Hystrix 101Hystrix monitoring of the 7.3.1 feign project 1027.4 Visualizing monito

, to tell the truth, I did not like this before (the dog you changed), or I junior high school results will not go to the bottom of the avalanche, then the result is good, and is very good, However, I and many of the funeral love of the family's compatriots, one into the internet bar deep like the sea, from the sister is passers-by, the amount. Seems a bit off the point, but I would like to say: You owe us to bury love family piece of cement land ....

. This binding relationship is declared on the graph with the V-model attribute of the input tag, so you might see in other places that someone has roughly called vue.js as the template engine for declarative rendering.7. Modular DevelopmentRemember that in the traditional front-end development, we are everyone to make a page, and then finally into a variety of back-end template engine, such as PHP smarty or Java JSP and so on.But now we do a single page application, page interaction and structu

Length 5 bitsdon't use easy-to-guess passwordsmodify regularly and do not use passwords that have been used recentlyencryption Method ;Symmetric encryption: Encryption and decryption use the same key:Key Distribution DifficultiesPublic Key cryptography: encryption and decryption using a pair of keysPublic key: Publicprivate key: ConfidentialCA: Certification Scheme AgencyBob AlicePKI:One-way encryption: Unique signatures for extracting data1, fixed-length output:2, non-reversible:3.

indicates that the user is lockedEncryption method:Symmetric encryption: Both encryption and decryption use the same password; playPublic Key cryptography: each password appears in pairs, one for the private key (Secretkey), and one for the public keyOne-way encryption, hash encryption: Extract data signature, also known as fingerprint encryption, often used for data integrity checkSingle characteristics: 1, avalanche effect, microwave changes of ini

Linux User ManagementUser: UID,/etc/passwdUser group: GID,/etc/groupShadow Password:User password:/etc/shadowUser group Password:/etc/gshadowUser Category:Admin: 0Normal Users: 1-66535System users: 1-499General Users: 500-6000User Group Category:Private group: When you create a user, if you have a group that you specify, the system automatically creates a group with the same name as the userBasic GroupAdditional groupsEncryption method:Symmetric encryption: Encrypt and decrypt using the same pas

1: Password file/etc/shadowCat/etc/shadow Red Line part for encrypted password650) this.width=650; "style=" Float:none; "title=" shadow. JPG "alt=" wkiol1brr-zdb0vcaah05ij-4p0973.jpg "src=" http://s2.51cto.com/wyfs02/M01/7D/9C/ Wkiol1brr-zdb0vcaah05ij-4p0973.jpg "/>2: Encryption methodSymmetric encryption: Encryption and decryption using the same key;Asymmetric encryption: Encryption and decryption using a pair of keys; public key-public; private key-secrecy;CA: Digital Certification AuthorityPK

signature;DSA: Digital Signature Algorithm, can only realize digital signature, sometimes this algorithm is also called DSS (digital signature Standard)ELgamal: Algorithm for chargingOne-way encryption algorithm:Encryption cannot be decrypted, and password fingerprints are extracted from known data;Characteristics:1. Fixed-length output:2. Avalanche effect:Function:Ensure the integrity of the data;Common algorithms:MD5: The fifth edition of the Infor

Encryption/Decryption PlainText, ciphertext Common methods of encryption: Symmetric encryption Public Key cryptography: The public key is generated in the private key; One-way encryption: The document can be generated by the plaintext ciphertext; in strict sense, it realizes the extraction of the data signature; The same data, using the same algorithm, the results of multiple calculations will be the same, so it is often used to verify data integrity; Fixed-length output: Re

confirm the identity of the sender;Key exchange: The sender encrypts a symmetric key with the other's public key and sends it to the other party;Data encryptionAlgorithms: RSA, DSA, ELGamalDss:digital Signature StandardDsa:digital Signature algorithmOne-way encryption: The data fingerprint is presented, can only be encrypted, not decrypted;Characteristics: fixed-length output, avalanche effect;function: completeness;Algorithm:Md5:message Digest 5, 12

Write7 111 rwx: Read and write executionC. User: UID/ETC/PASSWDAccount: Login NamePassword: passwordUid:GID: Basic Group IDComment: NotesHome Directory: Home directoriesShell: User's default shellGroup D: Gid/etc/groupGroup name: Password: GID: Comments: List of users with this group as additional groupsE./etc/shellsSpecifies the security shell that is available for the current system2. Shadow Password:A. User:/etc/shadowUser name: Password: Last time the password was modified: Minimum Age: Max