BZMPOP

Removes and returns a member by score from one or more sorted sets. Blocks until a member is available otherwise. Deletes the sorted set if the last element was popped.

Browse all commands · Upstream source documentation

Reference field	Value
Canonical name	BZMPOP
Catalog group	Sorted set commands
Upstream since	7.0.0 — upstream Redis/module version, not an ffkv release
Pinned catalog	Redis 8.10.0

Syntax

BZMPOP timeout numkeys key [key ...] <MIN | MAX> [COUNT count]

ffkv behavior and limits

Scores and lexicographic ranges are separate query modes. Do not rely on random-pop order; sorted-set storage remains RAM-resident in hybrid mode.

Source: README.md:275–295, 810–825; tests/bdd/features/sorted_sets.feature.

All requests share the 8 MiB framing/1,024-argument ingress limit; normal RESP replies have 64 MiB wire/logical budgets with bounded nesting/value counts. Management and Lua origins impose smaller budgets. These are not a process RSS cap. Catalog inclusion is not exhaustive option or wire-format parity. See limits and compatibility.

Upstream metadata

The following fields come from the pinned Redis metadata, not measured ffkv performance or an assertion that ffkv enforces every upstream flag. Running COMMAND INFO/COMMAND DOCS describe the current engine.

Upstream Redis complexity: O(K) + O(M*log(N)) where K is the number of provided keys, N being the number of elements in the sorted set, and M being the number of elements popped.

Upstream arity: -5 (includes the command name; a negative number is a minimum).

Command flags: WRITE, BLOCKING.

ACL categories: SORTEDSET.

Argument structure

Argument	Type	Constraints / metadata
timeout	double	Required
numkeys	integer	Required
key	key	multiple; key_spec_index: 0
where	oneof	Required
↳ min	pure-token	token: MIN
↳ max	pure-token	token: MAX
count	integer	optional; token: COUNT

Key specifications

Upstream key discovery descriptors (indexes are relative to the full command vector):

[
  {
    "flags": [
      "RW",
      "ACCESS",
      "DELETE"
    ],
    "begin_search": {
      "index": {
        "pos": 2
      }
    },
    "find_keys": {
      "keynum": {
        "keynumidx": 0,
        "firstkey": 1,
        "step": 1
      }
    }
  }
]

Additional pinned upstream metadata

{
  "group": "sorted_set",
  "since": "7.0.0"
}

Metadata source · Local snapshot: src/command_metadata.json, key bzmpop.

BDD coverage and source examples

These are source observations, not a test run performed by this documentation build. A tag identifies scenario intent; an extracted vector identifies a command invocation, which may intentionally produce an error. Scenarios may require setup, multiple connections, persistence, cluster nodes or native-module fixtures.

• Blocking multi pop wakes and caps count at available cardinality — tests/bdd/features/sorted_sets.feature:889; command tag and invocation observed.
• Multi pop validates count and timeout before taking a member — tests/bdd/features/sorted_sets.feature:1066; command tag and invocation observed.
• Blocking sorted-set timeouts return null without creating keys — tests/bdd/features/sorted_sets.feature:1167; command tag and invocation observed.
• RESP3 multi-pop keeps nested pairs and blocking pop keeps its flat tuple — tests/bdd/features/sorted_sets.feature:1203; command tag and invocation observed.

Extracted command vectors

The following JSON arrays are the test harness’s argument vectors, not shell commands. Numeric arguments are converted by the harness; objects of the form {"base64":"…"} represent decoded binary bytes, not a literal JSON command argument. Preserve scenario setup and connection ordering. See the CLI guide for shell quoting and binary stdin. No reply is invented or inferred.

RESP3 multi-pop keeps nested pairs and blocking pop keeps its flat tuple — tests/bdd/features/sorted_sets.feature:1218 (client “reader” executes:)

[
  "BZMPOP",
  "0",
  "1",
  "ranked",
  "MAX",
  "COUNT",
  "1"
]

Next source assertion: the reply equals:

["ranked",[["c",3.5]]]

Blocking sorted-set timeouts return null without creating keys — tests/bdd/features/sorted_sets.feature:1185 (client “many” sends:)

[
  "BZMPOP",
  "0.001",
  "1",
  "absent",
  "MIN",
  "COUNT",
  "2"
]

Next source assertion: client “many” receives:

null

Blocking multi pop wakes and caps count at available cardinality — tests/bdd/features/sorted_sets.feature:891 (client “waiting” sends:)

[
  "BZMPOP",
  "0",
  "2",
  "first",
  "second",
  "MIN",
  "COUNT",
  "3"
]