Redis bzpopmax 命令

BZPOPMAX key [key …] timeout

BZPOPMAX is the blocking variant of the sorted set ZPOPMAX primitive.

It is the blocking version because it blocks the connection when there are no
members to pop from any of the given sorted sets.
A member with the highest score is popped from first sorted set that is
non-empty, with the given keys being checked in the order that they are given.

The timeout argument is interpreted as an integer value specifying the maximum
number of seconds to block. A timeout of zero can be used to block indefinitely.

See the BZPOPMIN documentation for the exact semantics, since BZPOPMAX is identical to BZPOPMIN with the only difference being that it pops members
with the highest scores instead of popping the ones with the lowest scores.

*返回值

Array reply: specifically:

  • A nil multi-bulk when no element could be popped and the timeout expired.
  • A three-element multi-bulk with the first element being the name of the key
    where a member was popped, the second element is the popped member itself,
    and the third element is the score of the popped element.

*实例

redis> DEL zset1 zset2
(integer) 0
redis> ZADD zset1 0 a 1 b 2 c
(integer) 3
redis> BZPOPMAX zset1 zset2 0
1) "zset1"
2) "c"
3) "2"