Redis Overview

Redis (Remote Dictionary Server)

Today’s topic ,[object Object],[object Object],[object Object],[object Object]

Redis Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],Master Slave Slave server client client replication replication X

Redis Overview ,[object Object],[object Object],[object Object],[object Object],Master Slave SYNC DB file - saves DB file on disk - loads DB file into memory All accumulated commands modify the dataset ,[object Object],[object Object],[object Object],Fig. Replication procedure ,[object Object]

Redis Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Issue: replication 이 진행 중일 때 , slave 는 client request 에 갱신된 값을 줄 수 있을까 ? 성능에 영향은 ..?

Redis Overview ,[object Object],[object Object],Slave Master Client 1 Client 2 1. Subscribe foo 2. Publish foo (key) bar (value) 3. Message foo bar Fig. Pub/Sub procedure

Redis Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Redis Overview ,[object Object],[object Object],[object Object],Redis Parent child 1. fork() 2. The child starts to write the dataset to a temporary RDB file 3. When the child is done writing the new RDB file, it replaces the old one.

Redis Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Redis Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Client library ,[object Object],[object Object],[object Object],[object Object],[object Object]

Client library ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],“… Generally the current api is not stable and not well documented. Please have a look at the provided test cases (test_client.cpp) to see what is currently possible.” “ This is the official C client. Support for the whole command set, pipelining, event driven programming.” “ Support for executing commands on multiple servers in parallel via poll(2), ketama hashing. Includes PHP bindings.” “ Credis aims to be fast and minimalistic with respect to memory usage . It supports connections to multiple Redis servers. ... Current status is "almost complete“…”  찾을 수 없음

Functional test ,[object Object],[object Object],Node1 Node2 Master Slave ,[object Object],[object Object],[object Object],[object Object],Slave Master Node1 Node2 Node3 Master Slave Master Slave => POSSIBLE Node1 Node2 Node3 Master Slave Master Slave Master Slave => POSSIBLE

Functional test ,[object Object],[object Object],[object Object],[object Object],[object Object],Node1 Node2 Node3 Master Slave Master Slave Master Slave Node1 Node2 Node3 Node4 Node5 * 이상적인 구조 * Master/Slave 순환 구조

Performance test ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],VM-Client 1 - Redis client ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Issue: local 연산이 확연히 빠름 . 성능 향상을 위해 Redis server 측에 data 연산용 process 가 필요할까 ..?

Performance test ,[object Object],[object Object],[object Object],Data size (byte) SET time (sec) GET time (sec) 32 3.08 2.7 64 2.62 2.33 128 2.66 2.31 256 3.13 2.4 512 3.38 2.88 1024 4.41 4.38

Cluster 구성 ,[object Object],[object Object],[object Object],[object Object],Node1 Node2 Node3 Master Slave Master Slave Master Slave Client Node1 Node2 Node3 Master Slave Master Slave Master Slave X Client X X Command] > Slaveof no one > Slaveof node3_ip port - 장점 : replication 기능을 최대한 활용할 수 있음 - 단점 : Value update 가 안될 가능성이 존재

Cluster 구성 ,[object Object],[object Object],[object Object],Node1 Node2 Node3 Client Master Master Master - 장점 : 안전함 , master 하나에 장애가 발생해도 데이터 유지 , replication traffic 없음 - 단점 : Client 에서 다수의 connection 유지해야 함

Cluster 구성 ,[object Object],[object Object],[object Object],Node1 Node2 Node3 Client Slave Master Slave Client Client Node1 Node2 Node3 Client Slave Master Slave Client Client X X - 장점 : 방안 2 에 비해 connection 수가 적음 , Master/Slave 구조가 이상적임 - 단점 : 하나의 server 에 트래픽 집중 , slave 가 master 되기 전까지 서비스 불가

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object]

Redis Overview

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