TairHash is a hash data structure developed based on the redis module. TairHash not only has the same rich data interface and high performance as the native hash, but also can set the expiration and version for the field. TairHash provides an active expiration mechanism, even if the field is not accessed after expiration, it can be actively deleted to release the memory.
Supported redis version: redis >= 5.0
Advantages: can run in the low version of redis (redis >= 5.0)
Disadvantages: low efficiency of expire elimination (compared with SORT mode and SLAB mode)
Usage: cmake with default option, and recompile
Supported redis version: redis >= 7.0
Advantages: higher efficiency of expire elimination
Disadvantages: More memory consumption
Usage: cmake with -DSORT_MODE=yes
option, and recompile
Supported redis version: redis >= 7.0
Advantages: Efficient elimination, low memory consumption, and fast access bring new ideas to expiration algorithms
Disadvantages: More memory consumption
Usage: cmake with -DSLAB_MODE=yes
option, and recompile
tairhash will send an event notification when the field expires (triggered by active or passive expiration). The notification is sent in pubsub mode. The format of the channel is: tairhash@<db>@<key>__:<event>
, currently only supports expired event type, so
The channel is: tairhash@<db>@<key>__:expired
, and the message content is the expired field.
127.0.0.1:6379> EXHSET k f v ex 10
(integer) 1
127.0.0.1:6379> EXHGET k f
"v"
127.0.0.1:6379> EXISTS k
(integer) 1
127.0.0.1:6379> debug sleep 10
OK
(10.00s)
127.0.0.1:6379> EXISTS k
(integer) 0
127.0.0.1:6379> EXHGET k f
(nil)
127.0.0.1:6379> EXHSET k f v px 10000
(integer) 1
127.0.0.1:6379> EXHGET k f
"v"
127.0.0.1:6379> EXISTS k
(integer) 1
127.0.0.1:6379> debug sleep 10
OK
(10.00s)
127.0.0.1:6379> EXISTS k
(integer) 0
127.0.0.1:6379> EXHGET k f
(nil)
127.0.0.1:6379> EXHSET k f v VER 1
(integer) 1
127.0.0.1:6379> EXHSET k f v VER 1
(integer) 0
127.0.0.1:6379> EXHSET k f v VER 1
(error) ERR update version is stale
127.0.0.1:6379> EXHSET k f v ABS 1
(integer) 0
127.0.0.1:6379> EXHSET k f v ABS 2
(integer) 0
127.0.0.1:6379> EXHVER k f
(integer) 2
docker run -p 6379:6379 tairmodule/tairhash:latest
mkdir build
cd build
cmake ../ && make -j
then the tairhash_module.so library file will be generated in the lib directory
./redis-server --loadmodule /path/to/tairhash_module.so
tests
directory to set testmodule [file your_path/tairhash_module.so]
tests
directory to the all_tests of redis test_helper.tclTairHash: A redis module, similar to redis hash, but you can set expire and version for the field
TairZset: A redis module, similar to redis zset, but you can set multiple scores for each member to support multi-dimensional sorting
TairString: A redis module, similar to redis string, but you can set expire and version for the value. It also provides many very useful commands, such as cas/cad, etc.