Querying a Consumer Group

Function

This API is used to query a specified consumer group.

URI

GET /v2/{project_id}/mqs/instances/{instance_id}/management/groups/{group}

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID
instance_id	Yes	String	Instance ID
group	Yes	String	Consumer group ID

Request Parameters

None

Response Parameters

Status code: 200

**Table 2** Response body parameters
Parameter	Type	Description
[items]	Array of ShowGroupResp objects	OK.

**Table 3** ShowGroupResp
Parameter	Type	Description
group	Array of ShowGroupEntity objects	Consumer group information

**Table 4** ShowGroupEntity
Parameter	Type	Description
group_id	String	Consumer group name
state	String	Consumer group status. The value can be: Dead: The consumer group has no members and no metadata. Empty: The consumer group has metadata but has no members. PreparingRebalance: The consumer group is to be rebalanced. CompletingRebalance: All members have joined the group. Stable: Members in the consumer group can consume messages normally.
coordinator_id	Integer	Coordinator ID
members	Array of MemberEntity objects	Consumer list
group_message_offsets	Array of GroupMessageOffsetsEntity objects	Consumer offset
assignment_strategy	String	Partition assignment policy

**Table 5** MemberEntity
Parameter	Type	Description
host	String	Consumer address.
assignment	Array of AssignmentEntity objects	Details about the partition assigned to the consumer.
member_id	String	Consumer ID
client_id	String	Client ID

**Table 6** AssignmentEntity
Parameter	Type	Description
topic	String	Topic name.
partitions	Array of integers	Partition list

**Table 7** GroupMessageOffsetsEntity
Parameter	Type	Description
partition	Integer	Partition ID
lag	Integer	Number of remaining messages that can be consumed, that is, the number of accumulated messages.
topic	String	Topic name.
message_current_offset	Integer	Consumer offset
message_log_end_offset	Integer	Log end offset (LEO)

Example Requests

None

Example Responses

Status code: 200

The consumer group details are queried successfully.

{
  "group" : {
    "members" : [ {
      "host" : "/172.31.1.102",
      "assignment" : [ {
        "topic" : "test",
        "partitions" : [ 0, 1, 2 ]
      } ],
      "member_id" : "consumer-1-6b8ee551-d499-47d4-9beb-ba1527496785",
      "client_id" : "consumer-1"
    } ],
    "state" : "STABLE",
    "group_id" : "test-consumer-group",
    "coordinator_id" : 2,
    "group_message_offsets" : [ {
      "partition" : 0,
      "lag" : 31396,
      "topic" : "test",
      "message_current_offset" : 935,
      "message_log_end_offset" : 32331
    }, {
      "partition" : 0,
      "lag" : 0,
      "topic" : "aaaa",
      "message_current_offset" : 0,
      "message_log_end_offset" : 0
    }, {
      "partition" : 1,
      "lag" : 31279,
      "topic" : "test",
      "message_current_offset" : 1058,
      "message_log_end_offset" : 32337
    }, {
      "partition" : 1,
      "lag" : 0,
      "topic" : "aaaa",
      "message_current_offset" : 0,
      "message_log_end_offset" : 0
    }, {
      "partition" : 2,
      "lag" : 31603,
      "topic" : "test",
      "message_current_offset" : 739,
      "message_log_end_offset" : 32342
    } ],
    "assignment_strategy" : "range"
  }
}