Redis5.0.3配置文件详解(易读白话翻译)慢日志与延迟监控
########################## CLUSTER DOCKER/NAT support ######################### In certain deployments, Redis Cluster nodes address discovery fails, because
# addresses are NAT-ted or because ports are forwarded (the typical case is
# Docker and other containers).
#
# In order to make Redis Cluster working in such environments, a static
# configuration where each node knows its public address is needed. The
# following two options are used for this scope, and are:
#
# * cluster-announce-ip
# * cluster-announce-port
# * cluster-announce-bus-port
#
# Each instruct the node about its address, client port, and cluster message
# bus port. The information is then published in the header of the bus packets
# so that other nodes will be able to correctly map the address of the node
# publishing the information.
#
# If the above options are not used, the normal Redis Cluster auto-detection
# will be used instead.
#
# Note that when remapped, the bus port may not be at the fixed offset of
# clients port + 10000, so you can specify any port and bus-port depending
# on how they get remapped. If the bus-port is not set, a fixed offset of
# 10000 will be used as usually.
#
# Example:
#
# cluster-announce-ip 10.1.1.5
# cluster-announce-port 6379
# cluster-announce-bus-port 6380
################################## SLOW LOG 慢日志 ###################################
# The Redis Slow Log is a system to log queries that exceeded a specified
# execution time. The execution time does not include the I/O operations
# like talking with the client, sending the reply and so forth,
# but just the time needed to actually execute the command (this is the only
# stage of command execution where the thread is blocked and can not serve
# other requests in the meantime).
# 记录Redis执行耗时超过指定值的"查询命令"，整个"耗时"仅仅是执行命令的耗时(在这段时间内，因为线程被阻塞，其他命令会被阻塞)，不包括与客户端网络IO所耗时间或者发数据给客户端的耗时
#
# You can configure the slow log with two parameters: one tells Redis
# what is the execution time, in microseconds, to exceed in order for the
# command to get logged, and the other parameter is the length of the
# slow log. When a new command is logged the oldest one is removed from the
# queue of logged commands.
# 可以使用"slowlog-log-slower-than"指定耗时的阈值(单位是微妙)，一旦执行超过这个时间就会记录日志到缓冲区
# 可以使用"slowlog-max-len 128"指定队列长度，如果超过队列，最老的元素会被覆盖
#
# The following time is expressed in microseconds, so 1000000 is equivalent
# to one second. Note that a negative number disables the slow log, while
# a value of zero forces the logging of every command.
# 单位是微妙，不能设置为负值，如果设置为0，那么所有的查询命令都会记录到队列中
#
slowlog-log-slower-than 10000
# There is no limit to this length. Just be aware that it will consume memory.
# 最大值没有限制，我们只需要考虑内存是否足够大
# You can reclaim memory used by the slow log with SLOWLOG RESET.
# 可以使用slowlog reset回收已使用的内存
slowlog-max-len 128
################################ LATENCY MONITOR ##############################
# The Redis latency monitoring subsystem samples different operations
# at runtime in order to collect data related to possible sources of
# latency of a Redis instance.
# 延迟监控子系统通过采集运行时的不同操作去收集造成Redis实例延迟的相关可能来源
#
#
# Via the LATENCY command this information is available to the user that can
# print graphs and obtain reports.
# 可以通过latency命令获得可用信息的图表，比如latency docter xxx/latency graph等
#
# The system only logs operations that were performed in a time equal or
# greater than the amount of milliseconds specified via the
# latency-monitor-threshold configuration directive. When its value is set
# to zero, the latency monitor is turned off.
# 该监控子系统只会记录那些耗时>="latency-monitor-threshold"指定的值对应的操作，如果设置为0，表示关闭延时监控
#
# By default latency monitoring is disabled since it is mostly not needed
# if you don"t have latency issues, and collecting data has a performance
# impact, that while very small, can be measured under big load. Latency
# monitoring can easily be enabled at runtime using the command
# "CONFIG SET latency-monitor-threshold <milliseconds>" if needed.
# Redis默认是关闭了延迟监控的，因为绝大多数时间是用不着的，因为开启它有一定的性能损失，除非你的服务发生了延时而开启监控
# 当Redis是运行着的时候，可以通过config set latency-monitor-threshold xxx轻松开启监控
latency-monitor-threshold 0
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