Two Concurrent process access Same List will every pop same data from redis list

[Viren Negi]

Hello guys ,
this thing is bothering me for a while so I intend to ask
it at a place where I sure that I would get a correct answer .

I have a* redis List *called "*money_payout*" Where a list of all the
money that need to payed are stored

Now I connecting the redis using ruby redis client the list is quite vast
so In a process of faster paying out of money running multiple redis
client which are polling the same list.

Now the thing that bothering me is that

Consider a time when more than one redis client ping the redis for *pop* or
*BLPOP* request from the lists ("money_payout")

Let say the list currently contain

[500,100,290,900, ...] all in USD

so will there be ever be a chance that the two *pop request i.e
(LPOP/BLPOP) * sent to redis would return result to the two clients that
500 USD,500 USD instead of 500 USD and 100 USD

I want to know what happen in such situation I know such situation is
pretty rare to achieve but this one thing is boiling my head

I assuming that redis is smart enough to understand that an act accordingly
but that is just assumption

Guys in redis group your thought

Thanks

[Felix Gallo]

No. Redis is single threaded, so only one client is working 'at a
time', and the pop operation is atomic.

Post by Viren Negi
Hello guys ,
this thing is bothering me for a while so I intend to ask
it at a place where I sure that I would get a correct answer .
I have a redis List called "money_payout" Where a list of all the
money that need to payed are stored
Now I connecting the redis using ruby redis client the list is quite vast
so In a process of faster paying out of money running multiple redis client
which are polling the same list.
Now the thing that bothering me is that
Consider a time when more than one redis client ping the redis for pop or
BLPOP request from the lists ("money_payout")
Let say the list currently contain
[500,100,290,900, ...] all in USD
so will there be ever be a chance that the two pop request i.e (LPOP/BLPOP)
sent to redis would return result to the two clients that 500 USD,500 USD
instead of 500 USD and 100 USD
I want to know what happen in such situation I know such situation is pretty
rare to achieve but this one thing is boiling my head
I assuming that redis is smart enough to understand that an act accordingly
but that is just assumption
Guys in redis group your thought
Thanks
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