Ardb

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

Compile

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

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

storage_engine=kyotocabinet make
storage_engine=lmdb make
storage_engine=rocksdb make

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

Features

• Full redis-protocol compatible
• 2d spatial index supported. Spatial Index
• Most redis commands supported, and a few new commands
  • Ardb commands VS Redis Commands
• Different storage engine supported(LevelDB/KyotoCabinet/LMDB/RocksDB)
• Replication compatible with Redis 2.6/2.8
  • Ardb instance work as slave of Redis 2.6/2.8+ instance
  • Ardb instance work as master of Redis 2.6/2.8+ instance
  • Ardb instance work as slave of Ardb instance
  • Replication detail
• Auto failover support by redis-sentinel
• Backup data online
  • Use 'save/bgsave' to backup data
  • Use 'import' to import backup data
  • Backup & Restore

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(2.8.9)

• Unsupported Redis Commands:

• DUMP
• MIGRATE
• OBJECT
• RESTORE
• CONFIG RESETSTAT
• DEBUG
• MONITOR
• BITPOS
• PUBSUB

• Additional Commands:

• HClear/SClear/ZClear/LClear
• SUnionCount/SInterCount/SDiffCount
• ZAdd with limit
• ZPop/ZRPop
• HMIncrby
• __SET__/__DEL__(for replication)
• CompactDB/CompactAll
• BitOPCount
• Import
• KeysCount
• GeoAdd
• GeoSearch
• Cache