Redis-Demo

Courses and docs

• https://university.redis.com/dashboard
• https://university.redis.com/courses/course-v1:redislabs+RU101+2022_13/course/
• https://university.redis.com/courses/course-v1:redislabs+RU102J+2022_12/course/
• =====
• https://redis.io/docs/data-types/hashes/
• https://redis.io/commands/?group=hash
• =====
• https://spring.io/projects/spring-data-redis
• https://www.youtube.com/@Redisinc

Youtube videos

• https://youtu.be/p8mK8GBCARE
• https://youtu.be/GEg7s3i6Jak
• https://youtu.be/OqCK95AS-YE
• https://youtu.be/RAPKJFAiBb4
• https://youtu.be/infTV4ifNZY
• https://youtu.be/VLTPqImLapM
• https://youtu.be/Z8qcpXyMAiA

Redis runbook

https://redis.io/docs/getting-started/installation/install-redis-on-mac-os/

• brew install redis

• redis-server : to start redis in master slave mode

• brew services start redis : same as above

• brew services stop redis

• brew services info redis : check status

Redis Cli

Once Redis is up and running, you can test things by running redis command line interface (CLI):

• redis-cli
• keys *
• set mykey somevalue
• get mykey
• flushdb
• info stats
• info memory

Doc:

• https://redis.io/docs/getting-started/
• https://redis.io/docs/
• https://docs.spring.io/spring-data/redis/docs/current/api/org/springframework/data/redis/core/RedisTemplate.html

Jedis vs Lettuce

• https://redis.com/blog/jedis-vs-lettuce-an-exploration/

• Lettuce

  • Thread safe
  • supports cluster
  • capable of synchronous, asynchronous, and reactive interaction with the cluster
  • relatively difficult to use

• Jedis

  • Not thread safe; Need to create connection pool
  • supports cluster
  • capable of only synchronous interaction
  • relatively easy to use

Clustering

• https://redis.io/docs/reference/cluster-spec/
• https://docs.spring.io/spring-data/data-redis/docs/current/reference/html/#cluster

Creating and running a redis cluster

• https://wp.huangshiyang.com/creating-and-using-a-redis-cluster
• https://iamvishalkhare.medium.com/create-a-redis-cluster-faa89c5a6bb4
• mkdir cluster-test
• cd cluster-test
• mkdir 7000 7001 7002 7003 7004 7005
• cd 7000
• touch redis.conf
• then edit and add following content to the redis.conf file

port 7000
cluster-enabled yes
cluster-config-file nodes.conf
cluster-node-timeout 5000
appendonly yes

• then copy the file to all other folders (7001 .. 7005) and change the port accordingly

• 

• copy /usr/local/Cellar/redis/6.2.6/bin/redis-server and paste it in cluster-test folder that we created in the first step

• open 7 tabs in a separate command window

• in 6 tabs go to folders (7000 .. 7005) and run ../redis-server ./redis.conf

• 

• in the 7th tab run redis-cli --cluster create 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 --cluster-replicas 1

• type yes to confirm

• your redis cluster should be up and running and it should look something like below -

• 

• Now run redis CLI redis-cli -c -p 7001 for different ports and then execute commands as usual

Testing

Curl

Add A User:

curl --location --request POST 'localhost:8081/user/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "id": 1,
    "firstName": "tall",
    "lastName": "guy",
    "email": "tall.guy@gmail.com",
    "age": 35
}'

Verify: