Reids各版本特性

Redis 4 feature

• module
• psync2
• LFU eviction policy
• mixed rdb-aof format
• del/flushall/flushdb async
• MEMORY command
• CLUSTER DOCKER/NAT support

redis 3

• Redis Cluster

redis 2.8

• psync
• Slaves explicitly ping masters now, a master is able to detect a timed out slave independently.
• Masters can stop accepting writes if not enough slaves with a given maximum latency are connected
• Keyspace changes notifications via Pub/Sub
• CONFIG SET maxclients is now available
• Ability to bind multiple IP addresses
• Set process names so that you can recognize, in the "ps" command output, the listening port of an instance, or if it is a saving child
• Automatic memory check on crash
• CONFIG REWRITE is able to materialize the changes in the configuration operated using CONFIG SET into the redis.conf file
• PUBSUB command for Pub/Sub introspection capabilities
• EVALSHA can now be replicated as such, without requiring to be expanded to a full EVAL for the replication link
• Better Lua scripts error reporting
• SDIFF performance improved

redis 2.6

1. 支持lua脚本。
2. VM（虚拟内存）去掉了。
3. 对于client的limit限制变成无限制。
4. aof性能提升了不少。
5. key的过滤时间可以支持毫秒级别了，原来是秒。
6. list与hash 的属性filed或value包含小整数，内存优化列好（使用了jemalloc，以前是malloc）。
7. 提供了BITCOUNT与BITOP，前者支持位值count，后者支持了位操作。（以前只支持key-value 的置位操作）
8. 支持新命令dump以及restore ，即序列化与反序列化操作。
9. 大数据存储性能优化