Redis 发布订阅
Redis 的消息订阅/发布(pub/sub)是一种消息的模型，Redis客户端可以订阅任意数量级的频道，一旦某频道接收到消息时，订阅他的客户端就会收到信息，接下来演示一下实例：
1-1）、订阅窗口
[root@hadoop3 src]# ./redis-cli
127.0.0.1:6379> SUBSCRIBE message
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "message"
3) (integer) 1
1-2）、发布窗口
[root@hadoop3 src]# ./redis-cli
127.0.0.1:6379> PUBLISH message "new message"
(integer) 1
127.0.0.1:6379> PUBLISH message "new message1"
(integer) 1
1-3）、查看订阅窗口
127.0.0.1:6379> SUBSCRIBE message
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "message"
3) (integer) 1
1) "message"
2) "message"
3) "new message"
1) "message"
2) "message"
3) "new message1"
Redis 的性能测试
我们使用Redis自带的redis-benchmark进行测试
1-1）、查看帮助信息
[root@hadoop3 src]# ./redis-benchmark -h
Invalid option "-h" or option argument missing
Usage: redis-benchmark [-h <host>] [-p <port>] [-c <clients>] [-n <requests]> [-k <boolean>]
-h <hostname> Server hostname (default 127.0.0.1)
-p <port> Server port (default 6379)
-s <socket> Server socket (overrides host and port)
-a <password> Password for Redis Auth
-c <clients> Number of parallel connections (default 50)
-n <requests> Total number of requests (default 100000)
-d <size> Data size of SET/GET value in bytes (default 2)
-dbnum <db> SELECT the specified db number (default 0)
-k <boolean> 1=keep alive 0=reconnect (default 1)
-r <keyspacelen> Use random keys for SET/GET/INCR, random values for SADD
Using this option the benchmark will expand the string __rand_int__
inside an argument with a 12 digits number in the specified range
from 0 to keyspacelen-1. The substitution changes every time a command
is executed. Default tests use this to hit random keys in the
specified range.
-P <numreq> Pipeline <numreq> requests. Default 1 (no pipeline).
-q Quiet. Just show query/sec values
--csv Output in CSV format
-l Loop. Run the tests forever
-t <tests> Only run the comma separated list of tests. The test
names are the same as the ones produced as output.
-I Idle mode. Just open N idle connections and wait.
Examples:
Run the benchmark with the default configuration against 127.0.0.1:6379:
$ redis-benchmark
Use 20 parallel clients, for a total of 100k requests, against 192.168.1.1:
$ redis-benchmark -h 192.168.1.1 -p 6379 -n 100000 -c 20
Fill 127.0.0.1:6379 with about 1 million keys only using the SET test:
$ redis-benchmark -t set -n 1000000 -r 100000000
Benchmark 127.0.0.1:6379 for a few commands producing CSV output:
$ redis-benchmark -t ping,set,get -n 100000 --csv
Benchmark a specific command line:
$ redis-benchmark -r 10000 -n 10000 eval 'return redis.call("ping")' 0
Fill a list with 10000 random elements:
$ redis-benchmark -r 10000 -n 10000 lpush mylist __rand_int__
On user specified command lines __rand_int__ is replaced with a random integer
with a range of values selected by the -r option.
1-2）、实例
A）、测试并发
100个并发连接，100000个请求，检测host为localhost 端口为6379的redis服务器性能
[root@hadoop3 src]# ./redis-benchmark -h localhost -p 6379 -c 100 -n 1000
====== PING_INLINE ======
1000 requests completed in 0.04 seconds
100 parallel clients
3 bytes payload
keep alive: 1
****************
详细的参数请参考Blog
http://blog.csdn.net/xfg0218/article/details/52825874
B）、测试数据包的问题
测试存取大小为100字节的数据包的性能
[root@hadoop3 src]# ./redis-benchmark -h localhost -p 6379 -q -d 100
PING_INLINE: 31172.07 requests per second
PING_BULK: 33886.82 requests per second
SET: 30998.14 requests per second
GET: 30693.68 requests per second
INCR: 33079.72 requests per second
LPUSH: 29403.12 requests per second
LPOP: 32530.91 requests per second
SADD: 31377.47 requests per second
SPOP: 33134.53 requests per second
LPUSH (needed to benchmark LRANGE): 32393.91 requests per second
LRANGE_100 (first 100 elements): 12055.46 requests per second
LRANGE_300 (first 300 elements): 4528.58 requests per second
LRANGE_500 (first 450 elements): 2971.68 requests per second
LRANGE_600 (first 600 elements): 2184.22 requests per second
MSET (10 keys): 19361.08 requests per second
C）、测试set,lpush的性能
[root@hadoop3 src]# ./redis-benchmark -t set,lpush -n 1000 -q
SET: 33333.34 requests per second
LPUSH: 33333.34 requests per second
-q 是只显示测试的结果
D）、只测试某些数值存取的性能
[root@hadoop3 src]# ./redis-benchmark -n 1000 -q script load "redis.call('set','username','xiaozhang')"
script load redis.call('set','username','xiaozhang'): 27777.78 requests per second
Redis-trib.rb详解
[root@hadoop1 src]# ./redis-trib.rb help
Usage: redis-trib <command> <options> <arguments ...>
set-timeout host:port milliseconds
info host:port
check host:port
call host:port command arg arg .. arg
fix host:port
--timeout <arg>
help (show this help)
add-node new_host:new_port existing_host:existing_port
--slave
--master-id <arg>
rebalance host:port
--timeout <arg>
--use-empty-masters
--threshold <arg>
--auto-weights
--pipeline <arg>
--weight <arg>
--simulate
import host:port
--from <arg>
--replace
--copy
del-node host:port node_id
create host1:port1 ... hostN:portN
--replicas <arg>
reshard host:port
--from <arg>
--timeout <arg>
--yes
--slots <arg>
--to <arg>
--pipeline <arg>
For check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.
可以看到redis-trib.rb具有以下功能：
1、create：创建集群
2、check：检查集群
3、info：查看集群信息
4、fix：修复集群
5、reshard：在线迁移slot
6、rebalance：平衡集群节点slot数量
7、add-node：将新节点加入集群
8、del-node：从集群中删除节点
9、set-timeout：设置集群节点间心跳连接的超时时间
10、call：在集群全部节点上执行命令
11、import：将外部redis数据导入集群
具体的每一个功能请查看：
http://blog.csdn.net/xfg0218/article/details/56505216
或者
http://blog.csdn.net/xfg0218/article/details/56678783
