Help Center/ Distributed Message Service for Kafka/ API Reference/ APIs V2 (Recommended)/ Managing Messages/ Querying Offset of the Earliest Message in a Partition
Updated on 2025-05-06 GMT+08:00

Querying Offset of the Earliest Message in a Partition

Function

This API is used to query the offset of the earliest message in a partition.

Calling Method

For details, see Calling APIs.

URI

GET /v2/{project_id}/instances/{instance_id}/management/topics/{topic}/partitions/{partition}/beginning-message

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Parameter description:

Project ID. For details, see Obtaining a Project ID.

Constraints:

N/A

Value range:

N/A

Default value:

N/A

instance_id

Yes

String

Parameter description:

Instance ID. To obtain it, log in to the Kafka console and find the instance ID on the Kafka instance details page.

Constraints:

N/A

Value range:

N/A

Default value:

N/A

topic

Yes

String

Parameter description:

Topic name.

Constraints:

A topic name must start with a letter and can only contain letters, hyphens (-), underscores (_), and digits.

Value range:

N/A

Default value:

N/A

partition

Yes

Integer

Parameter description:

Partition ID.

Constraints:

N/A

Value range:

N/A

Default value:

N/A

Request Parameters

None

Response Parameters

Status code: 200

Table 2 Response body parameters

Parameter

Type

Description

topic

String

Parameter description:

Topic name.

Value range:

N/A

partition

Integer

Parameter description:

Partition ID.

Value range:

N/A

offset

Integer

Parameter description:

Message offset.

Value range:

N/A

timestamp

Long

Parameter description:

Message production time.

The value is a Unix timestamp. The unit is millisecond.

Value range:

N/A

Example Requests

GET https://{endpoint}/v2/{project_id}/instances/{instance_id}/management/topics/{topic}/partitions/{partition}/beginning-message

Example Responses

Status code: 200

The offset of the earliest message in a partition is queried successfully.

{
  "topic" : "mytest",
  "partition" : 0,
  "offset" : 9,
  "timestamp" : 1568125039164
}

SDK Sample Code

The SDK sample code is as follows.

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.kafka.v2.region.KafkaRegion;
import com.huaweicloud.sdk.kafka.v2.*;
import com.huaweicloud.sdk.kafka.v2.model.*;


public class ShowPartitionBeginningMessageSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        KafkaClient client = KafkaClient.newBuilder()
                .withCredential(auth)
                .withRegion(KafkaRegion.valueOf("<YOUR REGION>"))
                .build();
        ShowPartitionBeginningMessageRequest request = new ShowPartitionBeginningMessageRequest();
        request.withInstanceId("{instance_id}");
        request.withTopic("{topic}");
        request.withPartition({partition});
        try {
            ShowPartitionBeginningMessageResponse response = client.showPartitionBeginningMessage(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}
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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkkafka.v2.region.kafka_region import KafkaRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkkafka.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = KafkaClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(KafkaRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ShowPartitionBeginningMessageRequest()
        request.instance_id = "{instance_id}"
        request.topic = "{topic}"
        request.partition = {partition}
        response = client.show_partition_beginning_message(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)
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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    kafka "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/kafka/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/kafka/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/kafka/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := kafka.NewKafkaClient(
        kafka.KafkaClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ShowPartitionBeginningMessageRequest{}
	request.InstanceId = "{instance_id}"
	request.Topic = "{topic}"
	request.Partition = int32({partition})
	response, err := client.ShowPartitionBeginningMessage(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

Status Code

Description

200

The offset of the earliest message in a partition is queried successfully.

Error Codes

See Error Codes.

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