Our server is running a memcached cluster with version 1.4.15, and we seem
to run into a concurent trouble.
In our high concurrent system,
the client wanted to get key1(ctw9tjk) but got key2(cqv87p7)'s value, and
both key1 and key2 is not found in memcached after then.
key1(ctw9tjk) is set early:
> 2015/03/26 12:08:10.475382 [DEBUG]: memcached.Get, key; ctw9tjk, err:
> memcache: cache miss
> 2015/03/26 12:08:10.476899 [DEBUG]: memcached.Set, key; ctw9tjk, value:
> {"soff":2631931,"fsize":1925921,"suids":[1674786],"psectors":[36962488550619]},
>
> err: <nil>
>
wanted to get key1(ctw9tjk) but got key2(cqv87p7)'s value:
> 2015/03/26 23:22:51.990201 [DEBUG]: memcached.Get, key; ctw9tjk, value:
> {"soff":2648567,"fsize":1989935,"suids":[1674249],"psectors":[55439437858695]},
>
> err: <nil>
>
in the meanwhile, key2(cqv87p7) is fetched and updated
> 2015/03/26 23:22:51.986778 [DEBUG]: memcached.Get, key; cqv87p7, value:
> {"soff":2648567,"fsize":1989935,"suids":[1674249],"psectors":[24927990187254]},
>
> err: <nil>
> 2015/03/26 23:22:51.992312 [DEBUG]: memcached.Set, key; cqv87p7, value:
> {"soff":2648567,"fsize":1989935,"suids":[1674249],"psectors":[55439437858695]},
>
> err: <nil>
>
below is the related memcached's log
<https://lh3.googleusercontent.com/-fLH0bXaDJUE/VRTW3sG3cwI/AAAAAAAABTQ/H0AmwSipvyg/s1600/11111.jpg>
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