Ardb

Ardb is a BSD licensed, redis-protocol compatible persistent storage server, it support different storage engines. Currently LevelDB/KyotoCabinet/LMDB are supported, but only LevelDB engine is well tested.

Status

Still in developement, not full production ready yet.

Compile

LevelDB is the defaul storeage engine, to compile with leveldb, just type 'make' to compile server & lib & tests.

To use KyotoCabinet/LMDB as storage engine, you should set env 'storage_engine' first.

storage_engine=kyotocabinet make
storage_engine=lmdb make

It should compile to several executables in 'src' directory, such as ardb-server, ardb-test etc.

Features

• Full redis-protocol compatible
• Most redis commands supported
• Different storage engine supported(LevelDB/KyotoCabinet/LMDB)
• Replication(Master-Slave/Master-Master)
• Backup data online
• Simple Table data structure Table In Ardb

Client API

Since ardb is a full redis-protocol compatible server, you can use any redis client to connect it. Here lists all redis clients. http://www.redis.io/clients

Benchmark

Benchmarks were all performed on a four-core Intel(R) Xeon(R) CPU X3440 @ 2.53GHz, with 8 GB of DDR3 RAM.

The benchmark tool is 'redis-benchmark' from redis,50 parallel clients, 10000000 requests, 1000000 random keys each test case.

LevelDB Options: block_cache_size=512m, write_buffer_size=512m, thread_pool_size=2

Becnhmark data(./redis-benchmark -t 'xxx' -r 10000000 -n 10000000):
                                  Ardb-LevelDB(qps)    Redis(qps)
PING_INLINE	                      158730.16            156250
PING_BULK	                      161290.33            163934.42
SET	                              90859.53	            140845.06
GET	                              128279.13            149253.73
INCR	                          79841.59	            149253.73
LPUSH	                          74112.50	            161290.33
LPOP	                          41666.67	            161290.33
SADD	                          29583.09	            149253.73
SPOP	                          27638.05	            153846.16
LPUSH	                          72674.41	            161290.33
LRANGE_100(first 100 elements)	   15262.52             49019.61
LRANGE_300(first 300 elements)	   5015.80	            21008.4
LRANGE_500(first 450 elements)	   3430.06	            14684.29
LRANGE_600(first 600 elements)	   2614.72	            11312.22
MSET (10 keys)	                   12923.24	            54347.82

• Note: The 'get' performance in Ardb may be slower in reality becauseof cache missing.

Ardb vs Redis(2.6)

• Unsupported Redis Commands:

• DUMP
• MIGRATE
• OBJECT
• RANDOMKEY
• RESTORE
• BLPOP/BRPOP
• SRANDMEMBER
• EVAL/EVALSHA/SCRIPT
• AUTH
• CONFIG RESETSTAT
• DEBUG/MONITOR

• Additional Commands:

• HClear/SClear/ZClear/LClear
• SUnionCount/SInterCount/SDiffCount
• ZAdd with limit
• ZPop/ZRPop
• HMIncrby
• __SET__/__DEL__(for replication)
• TCreate/TDesc/TLen
• TInsert/TReplace
• TUpdate/TDel
• TCreateIndex
• TGet/TGetAll(Table commands)
• CompactDB/CompactAll
• BitOPCount
• SRange/SRevRange