[Translation] redis2.2 New Features

First with I am a buyer blog, the original connection: http://blog.woshimaijia.com/redis2-2%E6%96%B0%E7%89%88%E5%8A%9F%E8%83%BD%E4%BB%8B%E7%BB%8D/

I have been paying attention to redis. I used redis2.0.4 for a while and found that the official version of redis 2.2 is quite good. If there are any errors, please point out, ^ _ ^

Redis2.2 New Features

Major updates:

Memory efficiency memory efficiency (Major optimization)

-AlgorithmComplexity O (1) Improvement

-The pointer overhead of each element is close to a constant.

-Ziplist list Compression

-- Slightly CPU usage to reduce memory usage

-- Compress a single list of memory blocks

-- The value header is encoded with the value length.

-- More suitable for small traffic and small size

-- Redis uses the Hybrid Method

-- Hash table consumption

-- Calculate only the integer of 8 bytes

-- Note: the complexity of searching f in many pointer filling structures is O (1)

-Integer Set the intset

-- The idea is the same as ziplist, but it is ordered.

-- A value of an indefinite length can be searched in binary format.

-- Sadd/Srem complexity O (logn + memory size)

-- Sismember complexity O (logn)

-- What are the advantages of using intset instead of hash table when it is an integer range?

-- 10-15x Improvement

-- Impact on throughput (see figure)

-- Suitable for 20-50 K

-- Use the hybrid method like ziplists

-- Reduce general key space overhead (Vm enabled)

-- Sorting of datasets close to 20% increases

Increase Throughput throughput improvements (optimization of request/response)

Throughput

Reply response

-Merge response into large blocks.

-Each connection uses a fixed 7500-byte cache.

-More response responses

-Optimized request processingCode

-Batch request processing is simpler and faster

Expired improved expire semantics (modified the expiration Policy)

-Processing of expired keys (keys with expire configured)

<= 2.0: delete when writing

> = 2.2 not processed

Redis 2.2 version of whats_new_in, very look forward to the release of the new version of 2.2, with a period of time redis feel very good, continue to follow up, I am a buyer Project (http://woshimaijia.com) database will be transferred from MySQL to redis for a bold attempt

Connection: http://www.redis.io/presentation/Pnoordhuis_whats_new_in_2_2.pdf