Shulou(Shulou.com)06/01 Report--

AOF is log-based, similar to Oracle's redo,Mysql binlog log.

Configuration of Aof

Appendonly no # whether to turn on aof logging function

Appendfsync always # every command is immediately synchronized to aof. Safe, slow

Appendfsync everysec # compromise, write once per second

Appendfsync no # write work to the operating system, the operating system to determine the size of the buffer, unified write to aof. Low synchronization frequency and high speed

No-appendfsync-on-rewrite yes: # do you want to stop synchronizing aof while exporting rdb snapshots?

Auto-aof-rewrite-percentage 100 # aof file size compared to the size of the last rewrite, when the growth rate is 100%, rewrite

Auto-aof-rewrite-min-size 64mb # aof file, overridden when it exceeds at least 64m

Path to the appendfilename / var/dir/appendonly.aof # file

Do an experiment:

1, edit the redis.conf file

Enable the aof function and name aof filename

2 redis pkill-9

3, restart redis

[root@test-laoyangtest redis] # pkill-9 redis

[root@test-laoyangtest redis] #. / bin/redis-server. / redis.conf

4. View the aof file in the aof directory

[root@test-laoyangtest dir] # more laoyang-appendonly.aof-- empty

5, set a few keys, and then view the aof file

[root@test-laoyangtest redis] #. / bin/redis-cli

127.0.0.1 6379 > keys *

(empty list or set)

127.0.0.1 purl 6379 > set site www.woda.com

OK

127.0.0.1 purl 6379 > set www baidu.com

OK

The content of the aof file is generated.

[root@test-laoyangtest dir] # more laoyang-appendonly.aof

two

$6

SELECT

, 1

0

three

$3

Set

$4

Site

$12

Www.woda.com

* 3

$3

Set

$3

Www

9

Baidu.com

So there is a problem, if it is an automatically increasing value, the same key, 100 operations, aof back and forth to walk 100 records. How to solve?

All the key in memory has a specific state that inverts the value of key into a command.

For example, set age 1 and then incr age 100 times. So in the end, aof can directly set age 101 (this operation is called aof rewriting) to solve the growing problem of aof.

[these two parameters are controlled]

Auto-aof-rewrite-percentage 100 # aof file size compared to the size of the last rewrite, when the growth rate is 100%, rewrite

Auto-aof-rewrite-min-size 64mb # aof file, overridden when it exceeds at least 64m

Use the tool to write 2w commands

[root@test-laoyangtest redis] #. / bin/redis-benchmark-n 20000

= MSET (10 keys) =

20000 requests completed in 0.32 seconds

50 parallel clients

3 bytes payload

Keep alive: 1

95.03%

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