memcached - upgrading dalli gem from 2.6 to 2.7 in rails 4.1 app results in chaos -


after dalli gem upgrade 2.6 2.7 rails app behaves randomly.

suddenly simple rails.cache call responds unexpected results:

rails.cache.fetch(["some_key"])    "some-value" end

returns weired numbers like

278555296521270172266902296762213453293646297965197290197302295687284717213467197722257239

or array

[:created_at, "2017-07-11t17:46:58+02:00"][:updated_at, "2017-07-18t01:14:37+02:00"][:id, 1]

belonging different dataset.

i can guess it's kind of race conditions going on.

the changelog dalli refers breaking change between versions:

https://github.com/petergoldstein/dalli/blob/master/history.md#270

  • breaking change: dalli::client#add , #replace return truthy value, not boolean true or false.

but seems not related issue.

i tested new gem version on staging server, , worked fine. production servers high load , lot of users did throw above errors.

thanks help!


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