XINFO STREAM key [FULL [COUNT count]]

Available since: 5.0.0

Time complexity: O(1)

ACL categories: @read @stream @slow

This command returns information about the stream stored at <key>.

The informative details provided by this command are:

length: the number of entries in the stream (see XLEN)
radix-tree-keys: the number of keys in the underlying radix data structure
radix-tree-nodes: the number of nodes in the underlying radix data structure
groups: the number of consumer groups defined for the stream
last-generated-id: the ID of the least-recently entry that was added to the stream
first-entry: the ID and field-value tuples of the first entry in the stream
last-entry: the ID and field-value tuples of the last entry in the stream

The optional FULL modifier provides a more verbose reply. When provided, the FULL reply includes an entries array that consists of the stream entries (ID and field-value tuples) in ascending order. Furthermore, groups is also an array, and for each of the consumer groups it consists of the information reported by XINFO GROUP and XINFO CONSUMERS.

The COUNT option can be used to limit the number of stream and PEL entries that are returned (The first <count> entries are returned). The default COUNT is 10 and a COUNT of 0 means that all entries will be returned (execution time may be long if the stream has a lot of entries).

@return

@array-reply: a list of informational bits

@examples

Default reply:

> XINFO STREAM mystream
 1) length
 2) (integer) 2
 3) radix-tree-keys
 4) (integer) 1
 5) radix-tree-nodes
 6) (integer) 2
 7) groups
 8) (integer) 2
 9) last-generated-id
10) 1538385846314-0
11) first-entry
12) 1) 1538385820729-0
    2) 1) "foo"
       2) "bar"
13) last-entry
14) 1) 1538385846314-0
    2) 1) "field"
       2) "value"

Full reply:

> XADD mystream * foo bar
"1588152471065-0"
> XADD mystream * foo bar2
"1588152473531-0"
> XGROUP CREATE mystream mygroup 0-0
OK
> XREADGROUP GROUP mygroup Alice COUNT 1 STREAMS mystream >
1) 1) "mystream"
   2) 1) 1) "1588152471065-0"
         2) 1) "foo"
            2) "bar"
> XINFO STREAM mystream FULL
 1) "length"
 2) (integer) 2
 3) "radix-tree-keys"
 4) (integer) 1
 5) "radix-tree-nodes"
 6) (integer) 2
 7) "last-generated-id"
 8) "1588152473531-0"
 9) "entries"
10) 1) 1) "1588152471065-0"
       2) 1) "foo"
          2) "bar"
    2) 1) "1588152473531-0"
       2) 1) "foo"
          2) "bar2"
11) "groups"
12) 1)  1) "name"
        2) "mygroup"
        3) "last-delivered-id"
        4) "1588152471065-0"
        5) "pel-count"
        6) (integer) 1
        7) "pending"
        8) 1) 1) "1588152471065-0"
              2) "Alice"
              3) (integer) 1588152520299
              4) (integer) 1
        9) "consumers"
       10) 1) 1) "name"
              2) "Alice"
              3) "seen-time"
              4) (integer) 1588152520299
              5) "pel-count"
              6) (integer) 1
              7) "pending"
              8) 1) 1) "1588152471065-0"
                    2) (integer) 1588152520299
                    3) (integer) 1