“60秒内的10000变化”仅每3分钟运行一次。

Question

我在调查我们系统中的红宝石记忆问题。

我正在努力弄清楚所做的10000项改变是什么(在我看来太多了)

奇怪的是，我得到的10000 changes in 60 seconds. Saving...，但每3分钟，而不是60秒，正如我所期望的。

日志样本：

[10993] 03 Jan 06:37:46.166 * 10000 changes in 60 seconds. Saving...
[10993] 03 Jan 06:37:46.167 * Background saving started by pid 4802
[4802] 03 Jan 06:37:46.170 * DB saved on disk
[4802] 03 Jan 06:37:46.170 * RDB: 2 MB of memory used by copy-on-write
[10993] 03 Jan 06:37:46.268 * Background saving terminated with success
[10993] 03 Jan 06:40:27.140 * 10000 changes in 60 seconds. Saving...
[10993] 03 Jan 06:40:27.141 * Background saving started by pid 5081
[5081] 03 Jan 06:40:27.145 * DB saved on disk
[5081] 03 Jan 06:40:27.145 * RDB: 2 MB of memory used by copy-on-write
[10993] 03 Jan 06:40:27.242 * Background saving terminated with success
[10993] 03 Jan 06:43:08.335 * 10000 changes in 60 seconds. Saving...

redis_version:2.8.4

Answer 1

save 60 10000在您的配置中意味着，redis定期检查是否有至少10000次更改，和，它的是，至少是，从上次rdb保存开始60秒。只有在满足这两种条件(对于任何一个保存点)的情况下，才能启动新的rdb保存。

此外，如果您认为~3分钟内的10000次更改听起来很大，请不要忘记，一个命令可以将更改计数增加一个以上，例如MSET。

Answer 2

这是从redis.conf文件中复制的，它解释了一切。

################################ SNAPSHOTTING  ################################
#
# Save the DB on disk:
#
#   save <seconds> <changes>
#
#   Will save the DB if both the given number of seconds and the given
#   number of write operations against the DB occurred.
#
#   In the example below the behaviour will be to save:
#   after 900 sec (15 min) if at least 1 key changed
#   after 300 sec (5 min) if at least 10 keys changed
#   after 60 sec if at least 10000 keys changed
#
#   Note: you can disable saving completely by commenting out all "save" lines.
#
#   It is also possible to remove all the previously configured save
#   points by adding a save directive with a single empty string argument
#   like in the following example:
#
#   save ""

save 900 1
save 300 10
save 60 10000

如果要查看所有活动，请使用命令monitor

$ redis-cli monitor
1339518083.107412 [0 127.0.0.1:60866] "keys" "*"
1339518087.877697 [0 127.0.0.1:60866] "dbsize"
1339518090.420270 [0 127.0.0.1:60866] "set" "x" "6"
1339518096.506257 [0 127.0.0.1:60866] "get" "x"
1339518099.363765 [0 127.0.0.1:60866] "del" "x"
1339518100.544926 [0 127.0.0.1:60866] "get" "x"