WebClusters, Redis

serwer struktur danych w praktyce

PLAN
co to jest redis?
typy danych
zabójcze cechy
redis a memcached
redis w praktyce
tips & tricks

REDIS TO...

zaawansowany system klucz-wartość

REDIS TO...

serwer struktur danych

STRING

redis> SET my:key "value"

redis> GET my:key
"value"

STRING

redis> SET my:incr "10"

redis> INCR my:incr

redis> GET my:incr
"11"

STRING
redis> SET hello:world "Web"

redis> APPEND hello:world "Clusters"

redis> GET hello:world
"WebClusters"

redis> GETRANGE hello:world 0 2
"Web"

LIST
redis> LPUSH list a
redis> LPUSH list b
redis> RPUSH list c

redis> LRANGE list 0 2
1) "b"
2) "a"
3) "c

LIST
redis> LPUSH list a
redis> LPUSH list b
redis> RPUSH list c

redis> RPOPLPUSH list other:list
"a"

redis> LRANGE list 0 3
1) "c"
2) "b"

redis> LRANGE other:list 0 3
1) "a"

SET
redis> SADD post:1:tag "ruby"
redis> SADD post:1:tag "rails"
redis> SADD post:1:tag "redis"

redis> SADD post:2:tag "resque"

redis> SINTER post:1:tag post:2:tag
1) "redis"

SET
redis> SADD post:1:tag "ruby"
redis> SADD post:1:tag "rails"

redis> SADD post:2:tag "resque"

redis> SUNIONSTORE tag post:1:tag post:2:tag
redis> SMEMBERS tag
1) "rails"
2) "redis"
3) "resque"
4) "ruby"

ZSET
redis> ZADD zset 1 3

redis> ZRANGE zset 0 -1
1) "3"
2) "2"
3) "1"

HASH
redis> HMSET hash string:1 Hello
string:2 WebClusters

redis> HGETALL hash
1) "string:1"
2) "Hello"
3) "string:2"
4) "WebClusters"

HASH
redis> HSET hash string:1 Bye
redis> HSET hash string:3 2011

redis> HGETALL hash
1) "string:1"
2) "Bye"
3) "string:2"
4) "WebClusters"
5) "string:3"
6) "2011"

TRANSAKCJE
redis> SET account:1 30
redis> SET account:2 45

redis> MULTI
redis> INCRBY account:1 15
QUEUED

redis> DECRBY account:2 15
QUEUED

redis> EXEC
1) (integer) 45
2) (integer) 30

PERSYSTENCJA

snapshot
append-only ﬁle

PERSYSTENCJA

na żądanie
okresowa

http://www.ﬂickr.com/photos/chadelliott2012/5659144073/

http://www.ﬂickr.com/photos/15708236@N07/2754478731/

http://www.ﬂickr.com/photos/dan4th/301092024/

KLASTROWANIE

redis> #1 GET foo
-MOVED 3 192.168.1.1:6391

redis> #2 GET foo
"bar"

KLASTROWANIE

redis> #1 CLUSTER HINTS
* magic *

redis> #2 GET foo
"bar"

SET

memcached redis

6.926125 s 8.470477 s

PIPELINE SET

memcached redis

6.926125 s 0.916335 s

GET

memcached redis

6.904938 s 7.572058 s

PIPELINE GET

memcached redis

6.904938 s 0.651953 s

MGET

memcached redis

1.010348 s 0.185136 s

RAM

memcached redis

436 KB 1.1 MB

RAM

k 17 - 22 bajty
v 19 - 24 bajty

STRING

memcached redis

14 MB 13.9 MB

INTEGER

memcached redis

11 MB 10.7 MB

HASH

"an-average-key-1" => "1"
"an-average-key" => "1": "1"

HASH

memcached redis

11 MB 9 MB

640K ought to be
enough for anybody

http://www.ﬂickr.com/photos/memestate/45986749/

-- hello.lua
-- the first program in every language

io.write("Hello world, from ",_VERSION,"!n")

redis = Redis.new
script = <<LUA
local value = tonumber(redis.call('get',
KEYS[1]))
if value == nil then return {err = "Value at
key is not integer"} end
if value > tonumber(ARGV[1])
then
value = value - 1
redis.call('set', KEYS[1], value)
end
return value
LUA

redis.set :x, 4
5.times { puts(redis.eval(script, 1, :x, 0)) }

~/Code/webclusters-redis master $ ./run lua.rb
3
2
1
0
0

https://github.com/ﬁliptepper/webclusters-redis

WebClusters, Redis

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