Elastic Bandwidth

TDMQ for CKafka

Release Notes and Announcements

Release Notes

Broker Release Notes

Connector Release Notes

DataHub Release Notes

Announcement

Elastic Topic Feature Plan Termination Public Beta Announcement

TDMQ for CKafka Advanced Edition Launch Announcement

Product Introduction

Technical Principles

Consumer Group Status Description

Traffic Throttling Mechanism Description

Comparison with Apache Kafka

Use Limits

Regions and AZs

High Availability

Multi-AZ Deployment

Multi-Replica and Election Mechanism

Data High Reliability

Migrating Availability Zones

Purchase Guide

Product Specifications

Professional Edition - Elastic Storage

Billing Overview

Purchasing pay-as-you-go instances

Monthly Subscription

Converting Pay-As-You-Go Instances to Monthly Subscription

Getting Started

Obtaining Access Permission

Getting Access Authorization

Granting Operation-Level Permissions to Sub-Accounts

Granting Resource-Level Permissions to Sub-Accounts

Granting Tag-Level Permissions to Sub-Accounts

VPC Access

Step 1. Create an Instance

Step 2. Create a Topic

Step 3. Add a VPC Route

Step 4. Send/Receive Messages

Using SDK to Receive/Send Message (Recommended)

Running Kafka Client (Optional)

Access via Public Domain Name

Step 1. Create an Instance

Step 2. Add a Public Route

Step 3. Create a Topic

Step 4. Configure an ACL Policy

Step 5. Send/Receive Messages

Using SDK to Receive/Send Message (Recommended)

Running Kafka Client (Optional)

Development Guide

CKafka Transaction Management

CKafka Version Selection Suggestion

Common Parameter Configuration Description of CKafka

CKafka Data Compression

Integrating Legacy Self-Built Kafka

Operation Guide

Instance Management

Creating Instance

Naming with Consecutive Numeric Suffixes or Designated Pattern String

Viewing Instance

Upgrading Instances

Downgrading Instances

Terminating/Returning Instances

Change from Pay-as-You-Go to Monthly Subscription

Upgrading Instance Version

Adding Routing Policy

Connecting to Prometheus

AZ Migration

Setting Maintenance Time

Setting Message Size

Topic Management

Instance Topic

Setting Topic Traffic Throttling Rule

Elastic Topic

Topic Management

Subscription Management

Consumer Group

Consumer Group Overview

Creating Consumer Group

Querying Consumer Group

Deleting Consumer Group

Setting Offset

Automatically Resetting Offset

Monitoring and Alarms

Viewing Monitoring Data

Querying Advanced Monitoring (Pro Edition)

Configuring Alarms

Suggestions for Alarm Configuration

Viewing Advanced Ops Features (Pro Edition)

Smart Ops

Elastic Scaling

Disk Utilization Policy

Dynamic Partition Processing

Elastic Bandwidth

Permission Management

Configuring ACL Policy

Migration to Cloud

Migration Scheme Overview

Step 1. Purchasing CKafka Instance

Step 2. Migrating Topic to Cloud

Step 3. Migrating Data to Cloud

Scheme 1: Single-Producer Dual-Consumer Migration

Scheme 2: Single-Producer Single-Consumer Migration

Scheme 3: Migration with MirrorMaker

Scheme 4: Migrating Unconsumed Data

Data Compression

CKafka Connector

Introduction

Connection Management

Task Management

Creating Data Access Task

Creating Data Distribution Task

Data Target

Data Distribution to TDW

Simple Data Processing

Data Conversion

Filter Rule Description

Task Management

Schema Management

Event Center

Practical Tutorial

Troubleshooting

Topic Failures

Topic Creation Failure

No Topic Monitoring Data

Linkage Failure of Other Tencent Cloud Services Caused by Topic ACL Policy Configuration

Existence of Partition Message Heap

Consumer Group Failures

No Consumer Group Details Displayed

Consumer Group Constantly in PreparingRebalance Status

Client Failures

Common Client Errors and Solutions

Blockage of Messages Produced by Client

Client’s Failure to Consume Messages

Sarama Client

Message Failures

Consumption Data Exception

Failure to Delete Expired Messages Promptly

Slow Consumption Speed

Warning Displayed for Message Heap

Error Persistence After a Period of Production

API Documentation

Making API Requests

DataHub APIs

DescribeDatahubTopics

ACL APIs

Topic APIs

Instance APIs

CreatePostPaidInstance

DescribeInstanceAttributes

DescribeInstancesDetail

InquireCkafkaPrice

ModifyGroupOffsets

ModifyInstanceAttributes

Route APIs

Other APIs

DeleteRouteTriggerTime

DescribeAppInfo

DescribeCkafkaZone

DescribeConsumerGroup

SDK Documentation

SDK for Java

VPC Access Through SASL_SCRAM

Public Network Access Through SASL_PLAINTEXT

Access Through SASL_SSL

SDK for Python

VPC Access

Public Network Access Through SASL_PLAINTEXT

Public Network Access Through SASL_SSL

SDK for Go

VPC Access

Public Network Access Through SASL_PLAINTEXT

SDK for PHP

VPC Access

Public Network Access Through SASL_PLAINTEXT

SDK for C++

VPC Access

Public Network Access Through SASL_PLAINTEXT

SDK for Node.js

VPC Access

Public Network Access Through SASL_PLAINTEXT

SDK for Connector

Data Reporting SDK

Elastic Topic Message Sending and Receiving

Connecting Filebeats to CKafka

Connecting Logstash to CKafka

General References

Conducting Production and Consumption Pressure Testing on CKafka

Configuration Guide for Common Parameters in CKafka

Connecting to Legacy Self-Built Kafka

Suggestions for CKafka Version Selection

CKafka Data Reliability Description

Connector

Database Change Subscription

MongoDB Data Subscription

MySQL Data Subscription

PostgreSQL Data Subscription

Official Format Description for MySQL Subscription Messages

Canal Format of MySQL Subscription Message

User Permission Settings Reference for PostgreSQL Subscription by Connector

Data Processing

Data Processing Rule Description

Regular Expression Extraction

JSONPath Description

Self-Built Cluster Connection Instructions (CLB Method)

Authorization Instructions for Access to CLS and COS Services Through Connectors

What Is a Signaling Table

FAQs

Connector

Data Reporting Issues

Data Processing Issues

Data Dump

Data Subscription Issues

Service Level Agreement

Glossary

DocumentationTDMQ for CKafkaOperation GuideSmart OpsElastic ScalingElastic Bandwidth

Elastic Bandwidth

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Last updated: 2025-03-24 14:40:16

Elastic Bandwidth

Last updated: 2025-03-24 14:40:16

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Background
TDMQ for CKafka offers fixed bandwidth specifications, and supports the upgrade and downgrade feature. This facilitates users to make adjustments when there are changes in business. However, in the actual business operation scenarios, we often find unpredictable changes in business traffic. Also, due to potential data migration, the expansion time cannot be controlled, thus causing unexpected impacts on the business.
To address such issues, the Pro Edition of TDMQ for CKafka introduces the capability of elastic bandwidth. That is, when the business exceeds the cluster's fixed specifications, a certain degree of elastic space will still be provided to ensure the normal operation of the business.
Feature Overview
The Pro Edition of TDMQ for CKafka supports elastic bandwidth configuration. This is suitable for scenarios where there is occasional sudden traffic on the business. The part exceeding the instance specifications is charged on a pay-as-you-go basis, and the incremental part that can be added has an upper limit. If the business traffic exceeds the instance specifications for most of the time, it is recommended to quickly scale up or down using the existing upgrade and downgrade capability.
Billing Description
The pay-as-you-go method is adopted for elastic bandwidth. Once the billing mode is enabled, no fees will be incurred if elastic bandwidth is not used. The Pro Edition's console offers relevant monitoring metrics to help with observation.
The billing items for elastic bandwidth consist of two parts: elastic production traffic and elastic consumption traffic. The related billing methods are outlined in the following table:
Billing Items
Unit Price
Calculation Formula
Settlement Method
Elastic Production Fees
0.006 USD/GB/hour
Total Elastic Production Traffic (GB) (excluding traffic generated by replicas) x Elastic Pricing (CNY/GB) x Number of Replicas
The time is settled hourly. If the time is less than one hour, it is counted as one hour.
Billing is pushed daily
Elastic Consumption Fees
0.006 USD/GB/hour
Total Elastic Consumption Traffic (GB) (excluding traffic generated by replicas) x Elastic Pricing (CNY/GB)
The time is settled hourly. If the time is less than one hour, it is counted as one hour.
Billing is pushed daily
Key Metrics
When you enable elastic bandwidth in CKafka pro edition, you will see two elastic bandwidth metrics on the monitoring interface. Based on these metrics, you can observe whether the elastic space has been triggered for use, and it can also serve as a reference for billing calculations.
Elastic bandwidth production traffic
Sum of elastic bandwidth production traffic usage of this cluster instance in the selected time granularity.
elastic bandwidth consumption traffic
Sum of elastic bandwidth consumption traffic usage of this cluster instance in the selected time granularity.
Elastic Bandwidth Space
Available space of elastic bandwidth. It is related to Pro Edition cluster specifications, and below is the corresponding elastic interval.
Bandwidth Range (MB/s)
Upward Adjustment Margin (MB/s)
20~100
30
120~300
60
320~600
100
620~900
200
920~1200
600
1,600 and above
700
Use Limits
1. Current elastic bandwidth configuration does not support deactivation once enabled.
2. This feature is in allowlist grayscale testing. To enable, you may Contact Us.
﻿

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Billing Items	Unit Price	Calculation Formula	Settlement Method
Elastic Production Fees	0.006 USD/GB/hour	Total Elastic Production Traffic (GB) (excluding traffic generated by replicas) x Elastic Pricing (CNY/GB) x Number of Replicas	The time is settled hourly. If the time is less than one hour, it is counted as one hour. Billing is pushed daily
Elastic Consumption Fees	0.006 USD/GB/hour	Total Elastic Consumption Traffic (GB) (excluding traffic generated by replicas) x Elastic Pricing (CNY/GB)	The time is settled hourly. If the time is less than one hour, it is counted as one hour. Billing is pushed daily

Bandwidth Range (MB/s)	Upward Adjustment Margin (MB/s)
20~100	30
120~300	60
320~600	100
620~900	200
920~1200	600
1,600 and above	700

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