pubsub

so appropriate, expecting later versions to join the persistence feature.Second, the role of Pub/subIn fact, from the pub/sub mechanism, it is more like a broadcast system, multiple subscriber can subscribe to multiple channel, more than one publisher can publish messages to multiple channel. can be so simple to understand:Subscriber: Radio (only this radio can receive multiple channels and is displayed as a queue)Publisher: Radio (radio can be used to send messages in different FM channels)CHA

same channel (similarRadio). Otherwise, the subscriber will not receive the message after the publisher releases it! Redis_helper.py file (public class) 1 import redis 2 3 4 class RedisHelper (object): 5 6 def _ init _ (self): 7 self. _ conn = redis. redis (host = '2017. 0.0.1 ') 8 self. chan_sub = 'fm88. 7' # set two channels and subscribe to Channel 9 self. chan_pub = 'fm88. 7' # Release Channel 10 11 def public (self, msg): 12 self. _ conn. publish (self. chan_pub, msg) # publish message 13

The ability to use with open files is called context-managed1 #There are two ways to open a file:2 3f = open ('a.txt','R')4 5With open ('a.txt','R') as F6 7 implement use with close socket8 ImportContextlib9 ImportSocketTen One @contextlib. Contextmanage A defSock (ip,port): -Socket =Socket.socket () - Socket.bind ((ip,port)) theSocket.listen (5) - Try: - yieldSocket - finally: + socket.close () - + #Executes the sock function passed in the parameter, executes to the yield sock

Redis core interpretation-type system deconstruct Redis core explanation-data persistence process and RDB File Redis core explanation-AOF and REWRITE Mechanism Redis core-Slow Log Redis core interpretation-Implementation of transactions (Multi and CAS) Redis core-pubsub (publisher-subscriber mode) Implementation Redis core-cluster management tool (Redis-sentinel) Redis cluster discussion and WheatRedis description Original article

, Directive will be parsed, then bound, and watcher will be instantiated, so that the template-data will be associated. Image Description Observer Mode The mvc or mvvm framework by Lin Zong also basically uses the observer mode, which is also very useful, especially in complicated systems. With the observer mode, in typical ajax applications, the callback processing logic can be separated from the request, which makes the logic clearer. The following is a simple implementation of the publishing

/messages"]Exclude => ["*. gz", "shipper. log"]}Zeromq {Address => ["tcp: // 192.168.8.145: 8889"]Mode => "client"Type => "zmq-input"Topic => "weblog"Topology => "pubsub"Codec => "json"}}Filter {Mutate {Gsub => ["message", "APPS weblog", ""]Gsub => ["message", "{", ""]Gsub => ["message", "}", ""]}}Output {Stdout {debug => true debug_format => "json "}Elasticsearch {Cluster => "logstash"Codec => "json"}} Log category and Processing MethodApache Log: Cu

topicQ.unsubscribe = function(token) { for(varMinchTopics) {if(Topics[m]) { for(vari =0, j = topics[m].length; I if(Topics[m][i].token = = token) {Topics[m].splice (I,1);returnToken } } } }return false; };}) (PubSub);In addition, it is easy to implement the Publish/subscribe mode by using jquery events to bind the On/off method:(function ($) { var o = $({}); function () { arguments); }; func

-on-bgsave-error YesRdbcompression YesRdbchecksum YesDbfilename Dump.rdbRequirepass (23+_%^$34)Dir/data/redis/dataSlave-serve-stale-data YesSlave-read-only YesRepl-diskless-sync NoRepl-diskless-sync-delay 5Repl-disable-tcp-nodelay NoSlave-priority 100MaxMemory 2gAppendOnly YesAppendfilename "Appendonly.aof"Appendfsync everysecNo-appendfsync-on-rewrite NoAuto-aof-rewrite-percentage 100Auto-aof-rewrite-min-size 64MBaof-load-truncated YesLua-time-limit 5000Slowlog-log-slower-than 10000Slowlog-max-l

client */unsigned long getclientoutputbuffermemoryusage (redisclient *c)/* To get the size of the output buffer that has been used in the client */int Getclienttype (redisclient *c) int getclienttypebyname (char *name)/* 3 types of names in the client, normal,slave,pubsub */char * Getclienttypename (int class) int checkclientoutputbufferlimits (redisclient *c)/* Determines if the size of the output buffer for Clint exceeds the soft limit or the hard

so appropriate, expecting later versions to join the persistence feature.Second, the role of Pub/subIn fact, from the pub/sub mechanism, it is more like a broadcast system, multiple subscriber can subscribe to multiple channel, more than one publisher can publish messages to multiple channel. can be so simple to understand:Subscriber: Radio (only this radio can receive multiple channels and is displayed as a queue)Publisher: Radio (radio can be used to send messages in different FM channels)CHA

-error YesRdbcompression YesRdbchecksum YesDbfilename Dump.rdbdir/var/lib/redis/6379Slave-serve-stale-data YesSlave-read-only YesRepl-diskless-sync NoRepl-diskless-sync-delay 5Repl-disable-tcp-nodelay NoSlave-priority 100Requirepass IlanniredisAppendOnly NoAppendfilename "Appendonly.aof"Appendfsync everysecNo-appendfsync-on-rewrite NoAuto-aof-rewrite-percentage 100Auto-aof-rewrite-min-size 64MBaof-load-truncated YesLua-time-limit 5000Slowlog-log-slower-than 10000Slowlog-max-len 128Latency-monito

. The highly consistent nature, however, provides for strict ordering of writes and allows clients to do atomic updates of a Set of values. Managing state reliably are one of the more difficult things to does in any system. In a distributed system it's even more difficult as it brings in many subtle algorithms like raft or Paxos. By using ETCD, Kubernetes itself can concentrate on other parts of the system.The idea of watch in ETCD (and similar systems) are critical for how Kubernetes works. The

or more channels that match a given pattern punsubscribe [pattern [...]] unsubscribe from the specified rule and unsubscribe from all rules if there are no parameters PUBSUB subcommand [argument [argument ...]] View subscriptions and publish system status Note The client enters the subscription state when the Subscribe command is executed, where the client cannot use a command other than the 4 comman

is not over critical, the hash is stored in zipmap.#zipmap又称为 small hash, can greatly reduce the use of memoryList-max-ziplist-entries 512List-max-ziplist-value 64Set-max-intset-entries 512Zset-max-ziplist-entries 128Zset-max-ziplist-value 64activerehashing YesClient-output-buffer-limit Normal 0 0 0Client-output-buffer-limit slave 256MB 64MB 60Client-output-buffer-limit pubsub 32MB 8MB 60Hz 10#一个任务可以使用的cpu数目Aof-rewrite-incremental-fsync YesTcp-keepal

-dig.com slave-serve-stale-data Yes slave-read-only Yes repl-diskless-s Ync no Repl-diskless-sync-delay 5 repl-disable-tcp-nodelay no slave-priority requirepass www.z-dig.com no A Ppendfilename "appendonly.aof" Appendfsync everysec no-appendfsync-on-rewrite no auto-aof-rewrite-percentage 100 Auto-aof-rewrite-min-size 64mb aof-load-truncated Yes Lua-time-limit 5000 Slowlog-log-slower-than 10000 Slowlog-max-len 128 Latency-monitor-threshold 0 notIfy-keyspace-events "" Hash-max-ziplist-entries hash

Tags: scribe message open SRC init ima imp img RunOne: Redis Publish SubscriptionA Redis Publish Subscription (PUB/SUB) is a message communication pattern: the Sender (pub) sends a message and the Subscriber (sub) receives the message. Redis clients can subscribe to any number of channels. Shows the relationship between channel Channel1 and the three client--client2, CLIENT5, and client1 subscribing to this channel: When a new message is sent to channel Channel1 via the PUBLISH command, the mes

6379Masterauth Flux100platSlave-serve-stale-data YesSlave-read-only YesRepl-diskless-sync NoRepl-diskless-sync-delay 5Repl-disable-tcp-nodelay NoSlave-priority 100AppendOnly YesAppendfilename "Appendonly.aof"Appendfsync everysecNo-appendfsync-on-rewrite NoAuto-aof-rewrite-percentage 100Auto-aof-rewrite-min-size 64MBaof-load-truncated YesLua-time-limit 5000Slowlog-log-slower-than 10000Slowlog-max-len 128Latency-monitor-threshold 0Notify-keyspace-events ""Hash-max-ziplist-entries 512Hash-max-zipl