Pops the first element from one of multiple lists. Blocks until an element is available otherwise. Deletes the list if the last element was popped.
BLMPOP
timeout
numkeys key [key…]
<LEFT
|
RIGHT
>
[COUNT
count]
BLMPOP
is the blocking variant of
LMPOP
.
When any of the lists contains elements, this command behaves exactly
like LMPOP
. When used inside a
MULTI
/EXEC
block, this command behaves exactly
like LMPOP
. When all lists are empty, Valkey will block the
connection until another client pushes to it or until the
timeout
(a double value specifying the maximum number of
seconds to block) elapses. A timeout
of zero can be used to
block indefinitely.
See LMPOP
for more information.
One of the following:
Nil reply: when no element could be popped and the timeout is reached.
Array reply: a two-element array with the first element being the name of the key from which elements were popped, and the second element being an array of the popped elements.
One of the following:
Null reply: when no element could be popped and the timeout is reached.
Array reply: a two-element array with the first element being the name of the key from which elements were popped, and the second element being an array of the popped elements.
O(N+M) where N is the number of provided keys and M is the number of elements returned.
@blocking @list @slow @write
BLMOVE, BLPOP, BRPOP, LINDEX, LINSERT, LLEN, LMOVE, LMPOP, LPOP, LPOS, LPUSH, LPUSHX, LRANGE, LREM, LSET, LTRIM, RPOP, RPUSH, RPUSHX.