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https://github.com/projecteru/redis-cerberus

Redis Cluster Proxy
https://github.com/projecteru/redis-cerberus

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Redis Cluster Proxy

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README 

        
A Redis cluster proxy.



Build

===



Requirements:



* `make` and `cmake`

* UNIX-like system with `SO_REUSEPORT | SO_REUSEADDR` support

* `epoll` support

* pthread

* C++ compiler & lib with C++11 features, like g++ 4.8 or clang++ 3.2 (NOTE: install clang++ 3.2 on CentOS 6.5 won't compile because clang uses header files from gcc, which is version 4.4 without C++11 support)

* Google Test (for test)



To build, just



    make



turn on all debug logs



    make MODE=debug



or compile with g艹



    make COMPILER=g++



To link libstdc++ statically, use



    make STATIC_LINK=1



to run test (just cover message parsing parts)



    make runtest



run test with valgrind checking



    make runtest CHECK_MEM=1



Run

===



    cerberus CONFIG_FILE [ARGS]



The first argument is path of a configuration file, then optional arguments. Those specifies



* bind / `-b` : (integer) local port to listen; could also specified

* node / `-n` : (address) active nodes in a cluster; format should be *host1:port1,host2:port2*; could also set after cerberus launched, via the `SETREMOTES` command, see it below

* thread / `-t` : (integer) number of threads

* read-slave / `-r` : (optional, default off) set to "yes" to turn on read slave mode. A proxy in read-slave mode won't support writing commands like `SET`, `INCR`, `PUBLISH`, and it would select slave nodes for reading commands if possible. For more information please read [here (CN)](https://github.com/HunanTV/redis-cerberus/wiki/%E8%AF%BB%E5%86%99%E5%88%86%E7%A6%BB).

* read-slave-filter / `-R` : (optional, need read-slave set to "yes") if multiple slaves replicating one master, use the one whose host starts with this option value; for example, you have `10.0.0.1:7000` as a master, with 2 slave `10.0.1.1:8000` and `10.0.2.1:9000`, and read-slave-filter set to `10.0.1`, then `10.0.1.1:8000` is preferred. Note this option is no more than a string matching, so `10.0.1.1` and `10.0.10.1` won't be different on option value `10.0.1`

* cluster-require-full-coverage : (optional, default on) set to "no" to turn off full coverage mode, so proxy would keep serving when not all slots covered in a cluster.



The option set via ARGS would override it in the configuration file. For example



    cerberus example.conf -t 8



set the program to 8 threads.



Commands in Particular

===



Restricted Commands Bypass

---



* `MGET` : execute multiple `GET`s

* `MSET` : execute multiple `SET`s

* `DEL` : execute multiple `DEL`s

* `RENAME` : if source and destination are not in the same slot, execute a `GET`-`SET`-`DEL` sequence without atomicity

* `BLPOP` / `BRPOP` : one list limited; might return nil value before timeout [See detail (CN)](https://github.com/HunanTV/redis-cerberus/wiki/BLPOP-And-BRPOP)

* `EVAL` : one key limited; if any key which is not in the same slot with the argument key is in the lua script, a cross slot error would return



Extra Commands

---



* `PROXY` / `INFO`: show proxy information, including threads count, clients counts, commands statistics, and remote redis servers

* `KEYSINSLOT slot count`: list keys in a specified slot, same as `CLUSTER GETKEYSINSLOT slot count`

* `UPDATESLOTMAP`: notify each thread to update slot map after the next operation

* `SETREMOTES host port host port ...`: reset redis server addresses to arguments, and update slot map after that



Not Implemented

---



* keys: `KEYS`, `MIGRATE`, `MOVE`, `OBJECT`, `RANDOMKEY`, `RENAMENX`, `SCAN`, `BITOP`,

* list: `BRPOPLPUSH`, `RPOPLPUSH`,

* set: `SINTERSTORE`, `SDIFFSTORE`, `SINTER`, `SMOVE`, `SUNIONSTORE`,

* sorted set: `ZINTERSTORE`, `ZUNIONSTORE`,

* pub/sub: `PUBSUB`, `PUNSUBSCRIBE`, `UNSUBSCRIBE`,



others: `PFADD`, `PFCOUNT`, `PFMERGE`,

`EVALSHA`, `SCRIPT`,

`WATCH`, `UNWATCH`, `EXEC`, `DISCARD`, `MULTI`,

`SELECT`, `QUIT`, `ECHO`, `AUTH`,

`CLUSTER`, `BGREWRITEAOF`, `BGSAVE`, `CLIENT`, `COMMAND`, `CONFIG`,

`DBSIZE`, `DEBUG`, `FLUSHALL`, `FLUSHDB`, `LASTSAVE`, `MONITOR`,

`ROLE`, `SAVE`, `SHUTDOWN`, `SLAVEOF`, `SLOWLOG`, `SYNC`, `TIME`,



For more information please read [here (CN)](https://github.com/HunanTV/redis-cerberus/wiki/Redis-%E9%9B%86%E7%BE%A4%E4%BB%A3%E7%90%86%E5%9F%BA%E6%9C%AC%E5%8E%9F%E7%90%86%E4%B8%8E%E4%BD%BF%E7%94%A8).