Configure keystonemiddleware to deal with memcached pods failures #663
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Whenever one of the mecached pods disappears, because of a rolling restart during a minor update or as result of a failure, APIs can take a long time to detect that the pod went away and keep trying to reconnect. From a quick round of tests we saw downtimes up to ~150s. By tuning memcache_pool_dead_retry and memcache_pool_conn_get_timeout the behavior seems much more acceptable. Jira: https://issues.redhat.com/browse/OSPRH-11935
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fmount
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Dec 2, 2024
| @@ -46,6 +46,8 @@ username={{ .ServiceUser }} | |||
| password = {{ .ServicePassword }} | |||
| {{ if (index . "MemcachedServersWithInet") }} | |||
| memcached_servers = {{ .MemcachedServersWithInet }} | |||
| memcache_pool_dead_retry = 10 | |||
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Eventually, it would be great using annotations to tweak these kind of parameters, but we'll get there at some point.
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Whenever one of the mecached pods disappears, because of a rolling restart during a minor update or as result of a failure, APIs can take a long time to detect that the pod went away and keep trying to reconnect.
From a quick round of tests we saw downtimes up to ~150s.
By tuning memcache_pool_dead_retry and memcache_pool_conn_get_timeout the behavior seems much more acceptable.
Jira: https://issues.redhat.com/browse/OSPRH-11935