Redis is an in-memory database that supports key-value, hash, list, and set data structures. It can backup data to disk using RDB snapshots or AOF file appends. Redis supports master-slave replication where the master dumps data to slaves. It has high performance for common use cases like caches but has higher memory usage than databases. It can be used for caching, queues, and more.

1. Redis
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2. Redis
• disk backed in-memory database
• support
• k-v
• hash
• list
• set (sorted set)
• rdb/aof , master - slave

3. • int k-v 104 byte
•
• rediscounter
• hash
• hash-max-zipmap-size

4. •
• rehash
• get set
• redis 48g 4 8g 2 18g
34g 8 13 08:27 iPhone
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•

5. •
• rehash
• write aof
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•
• aof

6. • master -> slave
• master dump rdb, and send to slave
• master send every cmd to slave
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•
•
• pos eRedis

7. • rdb
• dump all data to disk
• fork
•
•

8. • aof
• append every write cmd to aof
• long recover time
• must bgrewrite from time to time
• bgrewrite
•

9. •
• eRedis
• rdb + aof with postion
• write
• write 2.4 rc8

10. • Java
• server
• jedis vs jredis
• pool lifo=false block time etc
• pool
• HA

11. pipeline
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12. hgetAll
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• mc cache

13. Thanks
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