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#datomic
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2020-06-23
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jwkoelewijn05:06:27

Hi, we are running an on-prem Datomic installation, with two memcached servers. My question is, are these 2 memcached servers redundant? In other words, could I take one offline, upgrade the underlying machine and bring it back online without any hickups?

favila11:06:48

Donno about hiccups, but the memcached servers are not replicas: each has half the segments

favila11:06:12

But this is really two different questions

favila11:06:39

What you really want to know is how will peers behave when a memcached becomes unreachable

favila11:06:33

I know everything will still work but I’m unsure if there will be extra blocking timeouts added to peer work or not.

marshall12:06:31

there will not be blocking timeouts

marshall12:06:49

the memcache response timeout is very short

marshall12:06:11

if it doesn’t return within that very short window the peer will go to storage instead

jwkoelewijn07:06:01

Thanks a lot for the explanations! helped in my understanding!

eallik19:06:25

what is the client API equivalent of subscriptions/HTTP SSE?