BRPOPLPUSHBlocking RPOPLPUSH: pop the source tail and push it onto the destination head.
| Syntax | BRPOPLPUSH source destination timeout |
| Group | list |
| Arity | 4 |
| Since | 1.0.0 |
| Flags | write, blocking |
| Complexity | O(1) to serve |
| Redis compatibility | differs: a cross-shard move is not atomic — the element is popped on the source's shard and pushed on the destination's, and between those two steps it is in neither list. Co-locate the keys with a {hashtag} to get Redis's atomic path |