memcached failover question
Marvin Addison
marvin.addison at gmail.com
Tue Jan 19 16:28:02 EST 2016
>
> So, is this normal behavior, and I read too much into
> MemcachedStorageService's ability to handle failover?
>
I believe the docs need to be updated. We recently discovered during an
outage that locatorType="CONSISTENT" prevents rehashing the key against the
reduced pool, which effectively leads to non-deterministic failures for
storage events. Basically anything that hashes to the downed node will
fail. We changed locatorType="ARRAY_MOD" and achieved the resiliency we
were after. Please make that change and report back. I will probably update
the docs either way; I'm fairly sure it's the best setting for most
deployments.
M
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