memcache: Make error-limiting values configurable

Code Issues Proposed changes

Previously these were all hardcoded; let operators tweak them as needed.
Significantly, this also allows operators to disable error-limiting
entirely, which may be a useful protection in case proxies are
configured with a single memcached server.
Use error_suppression_limit and error_suppression_interval to mirror the
option names used by the proxy-server to ratelimit backend Swift
servers.
Co-Authored-By: Alistair Coles <alistairncoles@gmail.com>
Change-Id: Ife005cb8545dd966d7b0e34e5496a0354c003881

This commit is contained in:

Tim Burke

2020年11月02日 15:27:16 -08:00

committed by Tim Burke

parent c75e23e81f

commit aff65242ff

6 changed files with 186 additions and 17 deletions

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8
etc/memcache.conf-sample

View File

@@ -26,3 +26,11 @@

# tries = 3

# Timeout for read and writes

# io_timeout = 2.0

#

# How long without an error before a server's error count is reset. This will

# also be how long before a server is reenabled after suppression is triggered.

# Set to 0 to disable error-limiting.

# error_suppression_interval = 60.0

#

# How many errors can accumulate before a server is temporarily ignored.

# error_suppression_limit = 10

9
etc/proxy-server.conf-sample

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@@ -160,6 +160,7 @@ use = egg:swift#proxy

#

# How long without an error before a node's error count is reset. This will

# also be how long before a node is reenabled after suppression is triggered.

# Set to 0 to disable error-limiting.

# error_suppression_interval = 60

#

# How many errors can accumulate before a node is temporarily ignored.

@@ -693,6 +694,14 @@ use = egg:swift#memcache

# Sets the maximum number of connections to each memcached server per worker

# memcache_max_connections = 2

#

# How long without an error before a server's error count is reset. This will

# also be how long before a server is reenabled after suppression is triggered.

# Set to 0 to disable error-limiting.

# error_suppression_interval = 60.0

#

# How many errors can accumulate before a server is temporarily ignored.

# error_suppression_limit = 10

#

# More options documented in memcache.conf-sample

[filter:ratelimit]