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configuration is simple. The server load can be pinged. the backend server status can be checked through the port, but url detection is not supported; 3. Anti-high concurrency, using the epoll network model to process customer requests; 4. Only HTTP and EMail are supported, and the application scope is relatively small; 5. nginx is mainly used for HTTP and reverse proxy servers, reducing system resource consumption. Four common algorithms: 1. RR: (default) Round Robin, which is distributed to b

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1. What is the mode of sharing? Flyweight pattern: Efficiently supports a large number of fine-grained objects in a shared manner. Reduces the performance consumption of system-created object instances by reusing objects that already exist in memory.The English of flyweight is a professional language from sports, especially the lightest level in boxing, wrestling and weightlifting competitions. Porting this word to software engineering is also used to

compression.Because gzip-cpu-intensive, this should only being used in scenarios whereThe compression ratio is very high (e.g. pretty-printed JSON or YAMLfiles).Use the *gzip* named argument to enable it. Valid values is 1..9, where 1Is the lightest compression and 9 the heaviest. 1 uses the least CPU onThe Master (and Minion), 9 uses the most.States1: View all States List: Salt ' jcfx-4 ' sys.list_state_modulesJcfx-4:-ACL-Alias-Alternatives-Apache-A

: knapsack problem, interval problem.Knapsack problem belongs to the relatively simple type, class teacher said the example is this type, this kind of problem either by the number of items as standard, or cost-effective standard, through a for loop can be solved. The key to solving knapsack problem with greedy method is how to select the greedy strategy, make the selection of each item in a certain order, and pack it into the backpack as much as possible, knowing that the backpack is filled. The

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different number of requests to different servers according to the size of the configured weights. If not set, the default is 1. The following server request order is: Abbabbabbabbabb ....upstream Mysvr { 127.0. 0.1:weight=1; 192.168. 10.121:weight=2;}4, Ip_hash:nginx will let the same client IP request the same server.upstream Mysvr { 127.0. 0.1:7878 192.168. 10.121:3333; ip_hash; }5, if you are not very understanding of the above 4 equalization algorithms, t

capacity equalization: This equalization algorithm allocates service requests to the lightest servers in the internal processing load (based on server CPU model, number of CPUs, memory size and current number of connections), due to the processing power of the internal server and the current network health, So this equalization algorithm is relatively more accurate, especially suitable for use in the case of the seventh Layer (application layer) load

.fail_timeout the time of the pause after max_fails failure. 5.backup all other non-backup machines are down or busy, requesting the backup machine. So the pressure on this machine is the lightest. Nginx supports multiple sets of load balancing at the same time, which is used for unused servers.Client_body_in_file_only set to on can be said that the client post data logging to the file used to do Debugclient_body_temp_path settings record file directo

and then blow a little coolness can make her become more hot.Search for mysterious areasIn the exploration of stimulating sensitive bands, do not forget the hair of men, whether it is rare in eastern men's chest hair, or beard and bearded, from the abdomen to the lower body hair , or bull, carefully feel the man's furry body and the smooth skin of women how different. Just like in fuqin, women can try to caress their partner's hair with the lightest

processing nor throwing the program out of a run-time error. Swallowed the message silently.OBJECTIVE-C provides two types of message forwarding options for subclasses of the NSObject class.Fast forwarding://重写NSObject类的该方法，将该方法转发给其他对象，就像是将对象的实现代码与转发对象合并到了一起，类似于类实现的多重继承行为-(id) forwardingTargetForSelector:(SEL)aSelectorStandard (FULL) Forwarding://重写NSObject类的该方法，可以让对象使用消息中的全部内容（目标，方法名和参数）-(void) forwardInvocation:(NSInvocation *)anInvocationThe following is a quick forward mechanism for the hyd

balancing; Backup: Reserved Standby machine. When all other non-backup machines fail or are busy, the backup machine is requested, so the pressure of the machine is the lightest; Max_fails: The number of times the request failed to be allowed, by default, 1. Returns the error defined by the Proxy_next_upstream module when the maximum number of times is exceeded; Fail_timeout: The time to pause the service after a max_fails failure. Max_fa

on the same server, which is a deep hidden danger of equalization. 2.3. FairThe fair policy is an extended policy that is not compiled into the Nginx kernel by default. The principle is to determine the load according to the response time of the back-end server, from which the lightest-load machine is selected for diversion. This strategy has a strong self-adaptability, but the actual network environment is often not so simple, so use caution. 2.4. U

alphabet called Yod/yodh in the Phoenician language, which is considered to represent the human finger. The initial lowercase letter I does not have a dot. I above the point is 11th century after the scribe for distinguishing the letter I ligatures (such as Filii) with the letter U only begin to Add. In addition, the writing or printing forms of I and J before 19th century are interchangeable, and dictionaries do not use them as two different letters for equivalence. As in Samueljohnson (1709-1

maintain a copy of the source system source table, the time of the Night Batch processing window at the specified times to capture the unified snapshot, Load the snapshot area (detailed in the 3rd chapter). Upload data manually on the day of upload to receive data quality audits, and loaded into the transition table. However, the flow of such data into the Downstream data mart is only combined with the system source data in the Night Run window. The manual data uploaded on that day is in princi

inheritance is different from the dashed line is realized; The Java code here is the public class Penbrush implents Ibrush () {}; Dependent relationshipsThe dependency is placed in the third because it is the lightest relationship between classes and classes, it can be unidirectional or bidirectional, but we usually use one-way to avoid bidirectional. (Pictures are reproduced from the Internet)dependency interpretation is slightly more problematic t

, in essence, the IP hash algorithm is a disguised polling algorithm, if the initial hash value of two IP is exactly the same, then the request from the two IP will always fall on the same server, which is a deep hidden danger of equalization.2.3. FairThe fair policy is an extended policy that is not compiled into the Nginx kernel by default. The principle is to determine the load according to the response time of the back-end server, from which the lightest