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- What's New
- Function Overview
- Service Overview
- Billing
-
Getting Started
- Creating a Function from Scratch and Executing the Function
- Creating a Function Using a Template and Executing the Function
- Creating an HTTP Function Using a Container Image and Executing the Function
- Creating an Event Function Using a Container Image and Executing the Function
- Getting Started with Common Practices
-
User Guide
- Replacing the Temporary AK/SK
- Before You Start
- Building Functions
-
Configuring Functions
- Configuring Initialization
- Configuring Basic Settings
- Configuring Agency Permissions
- Configuring the Network
- Configuring Disk Mounting
- Configuring Environment Variables
- Configuring Asynchronous Execution Notification
- Configuring Single-Instance Multi-Concurrency
- Managing Versions
- Managing Aliases
- Configuring Dynamic Memory
- Configuring Heartbeat Function
- Configuring Tags
- Configuring Snapshot-based Cold Start
- Configuring a Log Group and Log Stream
- Shared VPC
- Online Debugging
-
Creating Triggers
- Managing Triggers
- Using a Timer Trigger
- Using an APIG (Dedicated) Trigger
- Using a Kafka Trigger
- Using a DIS Trigger
- Using an SMN Trigger
- Using an LTS Trigger
- Using a CTS Trigger
- Using a DDS Trigger
- Using a GeminiDB Mongo Trigger
- Using an APIG Trigger
- Using an APIC Trigger
- Using a DMS (for RabbitMQ) Trigger
- Using an Open-Source Kafka Trigger
- Cron Expressions for a Function Timer Trigger
- Using an EG Trigger
- Invoking the Function
- Monitoring
- Function Management
- Dependency Management
- Reserved Instance Management (Old)
- Reserved Instance Management
- Flow Management
- Increasing Resource Quota
- GPU Function Management
- Application Center
- Sharing
- Programmable CDN Function
- CLI Command Reference
- Audit
-
Best Practices
- FunctionGraph Best Practices
- Processing DIS Data
- Integrating with LTS to Analyze Logs in Real Time
- Integrating with CTS to Analyze Login/Logout Security
- Periodically Starting or Stopping Huawei Cloud ECSs
- Building an HTTP Function with Spring Boot
- Creating a FunctionGraph Backend API That Uses a Custom Authorizer
- Uploading Files with FunctionGraph and APIG
- Processing IoT Data
- Workflow + Function: Automatically Processing Data in OBS
- Filtering Logs in Real Time by Using FunctionGraph and LTS
- Building an HTTP Function with Go
- Using FunctionGraph HTTP Functions to Process gRPC Requests
- Cold Start Optimization Practices
-
Developer Guide
- Overview
- Initializer
- Node.js
- Python
- Java
- Go
- C#
- PHP
- Development Tools
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- Examples
- Extension and OpenTelemetry APIs
-
APIs
- Function Invocation
- Function Quotas
- Dependencies
- Test Events
- Function Tracing
-
Function Lifecycle Management
- Querying Functions
- Creating a Function
- Deleting a Function or Function Version
- Querying the Code of a Function
- Modifying the Code of a Function
- Querying the Metadata of a Function
- Modifying the Metadata of a Function
- Updating Max. Instances of a Function
- Querying Function Tags
- Enabling or Disabling the Snapshot Function
- Querying ServiceBridge Functions Bound to a Specified Function
- Querying Snapshot Status
- Querying Resource Tags
- Querying Resources
- Deleting Resource Tags
- Creating Resource Tags
- Creating a VPC Endpoint
- Deleting a VPC Endpoint
- Updating the Pinning Status of a Function
- Querying the Available ServiceBridge Version
- Versions and Aliases
- Function Metrics
- Function Logs
- Function Templates
- Reserved Instances
- Function Import and Export
- Function Triggers
-
Function Flows
- Executing a Flow Synchronously
- Executing a Flow Asynchronously
- Deleting Flows
- Querying a Flow
- Creating a Flow
- Querying Instances of a Flow
- Querying a Flow Instance
- Querying Metadata of a Flow Instance
- Modifying Metadata of a Flow Instance
- Querying Flow Metrics
- Querying Metrics of a Flow
- Re-executing a Flow
- Stopping a Flow
- Querying Records of a Flow in Pagination Mode
- Calling Back a Flow
-
Asynchronous Execution Notification
- Querying Asynchronous Execution Notification Settings of a Function Version
- Deleting Asynchronous Execution Notification Settings
- Configuring Asynchronous Execution Notification
- Querying Asynchronous Execution Notification Settings of a Function's All Versions
- Querying Asynchronous Invocation Requests
- Querying Active Asynchronous Invocation Requests
- Stopping an Asynchronous Invocation Request
- Permissions Policies and Supported Actions
- Appendix
- Change History
- SDK Reference
-
FAQs
-
General FAQs
- What Is FunctionGraph?
- Do I Need to Apply for Any Compute, Storage, or Network Services When Using FunctionGraph?
- Do I Need to Deploy My Code After Programming?
- How Do I Obtain a Token?
- What Runtimes Does FunctionGraph Support?
- How Much Disk Space Is Allocated to Each FunctionGraph Function?
- Does FunctionGraph Support Function Versioning?
- How Does a Function Read or Write Files?
- How Do I Set a Proxy When Using CLI?
- Does FunctionGraph Support Function Extension?
- Which Permissions Are Required for an IAM User to Use FunctionGraph?
- How Can I Create an ODBC Drive-based Python Dependency Package for Database Query?
- What Is the Quota of FunctionGraph?
- What Chinese Fonts Does FunctionGraph Support?
- How Does FunctionGraph Resolve a Private DNS Domain Name?
- How Does a Container Image–based Function Resolve a Private DNS Domain Name?
- How Do I Use a Domain Name to Access an API Registered with API Gateway (Dedicated)?
- What Are the Common Application Scenarios of FunctionGraph?
- Why Can't the API Gateway Domain Name Bound to a Service Be Resolved During Function Invocation?
- Does FunctionGraph Support Synchronous Transmission at the Maximum Intranet Bandwidth?
- What If the VPC Quota Is Used Up?
- How Can I Print Info, Error, or Warn Logs?
- Can I Set the Domain Name of an API to My Own Domain Name?
- Can I Change the Runtime?
- Can I Change a Function's Name?
- Why Is Message "failed to mount exist system path" Displayed?
- How Do I Obtain Uploaded Files?
- Why Can't I Receive Responses for Synchronous Invocation?
- What Should I Do If the os.system("command &") Execution Logs Are Not Collected?
- Which Directories Can Be Accessed When a Custom Runtime Is Used?
- Which Minor Versions of Python 3.6 and 3.9 Are Supported?
- Which Actions Can Be Used Instead of a VPC Administrator Agency for VPC Access?
- What Are the Possible Causes for Function Timeout?
- How Do I Obtain the Code of a Function?
- Do You Have Sample Code for Initializers?
- How Do I Enable Structured Log Query?
- Can I Enable a Listening Port in a Function to Receive External TCP Requests via EIP?
- Does FunctionGraph Support Domain Name Resolution?
- How Do I Obtain the Source IP Address of an HTTP Request Initiated by a Function?
- Function Creation FAQs
-
Trigger Management FAQs
- What Events Can Trigger a FunctionGraph Function?
- What If Error Code 500 Is Reported When Functions that Use APIG Triggers Return Strings?
- What Do LATEST and TRIM_HORIZON Mean in DIS Trigger Configuration?
- How Do I Use an APIG Trigger to Invoke a Function?
- How Does a Function Obtain the Request Path or Parameters When Using an APIG Trigger?
- Can I Configure a Kafka Trigger in a Different Subnet from My Function?
-
Dependency Management FAQs
- What Is a Dependency?
- When Do I Need a Dependency?
- What Are the Precautions for Using a Dependency?
- What Dependencies Does FunctionGraph Support?
- Does FunctionGraph Support Class Libraries?
- How Do I Use Third-Party Dependencies on FunctionGraph?
- How Do I Create Function Dependencies?
- How Do I Create a Dependency on the FunctionGraph Console?
- How Do I Add a Dependency to a Function?
-
Function Execution FAQs
- How Long Does It Take to Execute a FunctionGraph Function?
- Which Steps Are Included in Function Execution?
- How Does FunctionGraph Process Concurrent Requests?
- What If Function Instances Have Not Been Executed for a Long Time?
- How Can I Speed Up Initial Access to a Function?
- How Do I Know the Actual Memory Used for Function Execution?
- Why Is My First Request Slow?
- What Do I Do If an Error Occurs When Calling an API?
- How Do I Read the Request Header of a Function?
- Can the Synchronous Execution Interface Be Invoked on a Private Network?
- Why Does a Function Use More Memory Than Estimated and Even Trigger the Out of Memory Alarm?
- How Do I Check the Memory Usage When Seeing "runtime memory limit exceeded"?
- How Do I Troubleshoot "CrashLoopBackOff"?
- After I Updated an Image with the Same Name, Reserved Instances Still Use the Old Image. What Can I Do?
- Function Configuration FAQs
- External Resource Access FAQs
-
Other FAQs
- How Do I View the Alarm Rules Configured for a Function?
- Does FunctionGraph Support ZIP Decompiling During Video Transcoding?
- Will Resources Created During FunctionGraph 2.0 OBT Be Automatically Released When They Expire? Will Them Be Billed?
- What Is an App in FunctionGraph?
- Do I Need to Pay for Cold Start Time?
- Why Am I Seeing a Message Indicating that My Account Was Suspended When Creating a Function?
- Will the Requests of All My Functions in Different Regions Be Billed?
- Migration from FunctionGraph V1 to V2
-
General FAQs
-
More Documents
-
User Guide (ME-Abu Dhabi Region)
- Service Overview
- Getting Started
- Before You Start
- Building Functions
-
Configuring Functions
- Configuring Initialization
- Configuring Basic Settings
- Configuring Agency Permissions
- Configuring the Network
- Configuring Disk Mounting
- Configuring Environment Variables
- Configuring Asynchronous Execution Notification
- Configuring Single-Instance Multi-Concurrency
- Managing Versions
- Managing Aliases
- Configuring Dynamic Memory
- Configuring Heartbeat Function
- Online Debugging
- Creating Triggers
- Invoking the Function
- Monitoring
- Function Management
- Dependency Management
- Reserved Instance Management
- Increasing Resource Quota
- Audit
-
FAQs
-
General FAQs
- What Is FunctionGraph?
- Do I Need to Apply for Any Compute, Storage, or Network Services When Using FunctionGraph?
- Do I Need to Deploy My Code After Programming?
- What Runtimes Does FunctionGraph Support?
- How Much Disk Space Is Allocated to Each FunctionGraph Function?
- Does FunctionGraph Support Function Versioning?
- How Does a Function Read or Write Files?
- Does FunctionGraph Support Function Extension?
- Which Permissions Are Required for an IAM User to Use FunctionGraph?
- How Can I Create an ODBC Drive-based Python Dependency Package for Database Query?
- What Is the Quota of FunctionGraph?
- How Does FunctionGraph Resolve a Private DNS Domain Name?
- How Does a Container Image–based Function Resolve a Private DNS Domain Name?
- How Do I Use a Domain Name to Access an API Registered with API Gateway (Dedicated)?
- What Are the Common Application Scenarios of FunctionGraph?
- Why Can't the API Gateway Domain Name Bound to a Service Be Resolved During Function Invocation?
- Does FunctionGraph Support Synchronous Transmission at the Maximum Intranet Bandwidth?
- What If the VPC Quota Is Used Up?
- How Can I Print Info, Error, or Warn Logs?
- Can I Set the Domain Name of an API to My Own Domain Name?
- Can I Change the Runtime?
- Can I Change a Function's Name?
- Why Is Message "failed to mount exist system path" Displayed?
- How Do I Obtain Uploaded Files?
- Why Can't I Receive Responses for Synchronous Invocation?
- What Should I Do If the os.system("command &") Execution Logs Are Not Collected?
- Which Directories Can Be Accessed When a Custom Runtime Is Used?
- Which Minor Versions of Python 3.6 and 3.9 Are Supported?
- Which Actions Can Be Used Instead of a VPC Administrator Agency for VPC Access?
- What Are the Possible Causes for Function Timeout?
- How Do I Obtain the Code of a Function?
- Do You Have Sample Code for Initializers?
- How Do I Enable Structured Log Query?
- Can I Enable a Listening Port in a Function to Receive External TCP Requests via EIP?
- Function Creation FAQs
-
Trigger Management FAQs
- What Events Can Trigger a FunctionGraph Function?
- What If Error Code 500 Is Reported When Functions that Use APIG Triggers Return Strings?
- What Do LATEST and TRIM_HORIZON Mean in DIS Trigger Configuration?
- Why Can't I Enable or Disable OBS Triggers by Calling APIs?
- How Do I Use an APIG Trigger to Invoke a Function?
- How Does a Function Obtain the Request Path or Parameters When Using an APIG Trigger?
- Can I Create an OBS Trigger with an Existing Bucket?
-
Dependency Management FAQs
- What Is a Dependency?
- When Do I Need a Dependency?
- What Are the Precautions for Using a Dependency?
- What Dependencies Does FunctionGraph Support?
- Does FunctionGraph Support Class Libraries?
- How Do I Use Third-Party Dependencies on FunctionGraph?
- How Do I Create Function Dependencies?
- How Do I Create a Dependency on the FunctionGraph Console?
- How Do I Add a Dependency to a Function?
-
Function Execution FAQs
- How Long Does It Take to Execute a FunctionGraph Function?
- Which Steps Are Included in Function Execution?
- How Does FunctionGraph Process Concurrent Requests?
- What If Function Instances Have Not Been Executed for a Long Time?
- How Can I Speed Up Initial Access to a Function?
- How Do I Know the Actual Memory Used for Function Execution?
- Why Is My First Request Slow?
- What Do I Do If an Error Occurs When Calling an API?
- How Do I Read the Request Header of a Function?
- Why Does a Function Use More Memory Than Estimated and Even Trigger the Out of Memory Alarm?
- How Do I Check the Memory Usage When Seeing "runtime memory limit exceeded"?
- How Do I Troubleshoot "CrashLoopBackOff"?
- After I Updated an Image with the Same Name, Reserved Instances Still Use the Old Image. What Can I Do?
- Function Configuration FAQs
- External Resource Access FAQs
- Other FAQs
-
General FAQs
-
API Reference (ME-Abu Dhabi Region)
- Before You Start
- API Overview
- Calling APIs
- Function Model Definition
-
Function Management Zone APIs
- Querying a Function List
- Querying the Metadata of a Function
- Querying the Code of a Function
- Creating a Function
- Deleting a Function or Function Version
- Modifying the Code of a Function
- Modifying the Metadata of a Function
- Publishing a Function Version
- Querying the Versions of a Function
- Creating an Alias for a Function Version
- Modifying the Alias Information About a Function Version
- Deleting an Alias of a Function Version
- Querying the Alias Information About a Function Version
- Querying the Version Alias List of a Function
- Querying All Triggers of a Function
- Querying the Information About a Trigger
- Deleting All Triggers of a Function
- Creating a Trigger
- Deleting a Trigger
- Function Data Zone APIs
- Permissions Policies and Supported Actions
- Appendix
- Change History
- Developer Guide (ME-Abu Dhabi Region)
-
User Guide (Kuala Lumpur Region)
- Service Overview
- Getting Started
- Before You Start
- Building Functions
-
Configuring Functions
- Configuring Initialization
- Configuring Basic Settings
- Configuring Agency Permissions
- Configuring the Network
- Configuring Disk Mounting
- Configuring Environment Variables
- Configuring Asynchronous Execution Notification
- Configuring Single-Instance Multi-Concurrency
- Managing Versions
- Managing Aliases
- Configuring Dynamic Memory
- Online Debugging
- Creating Triggers
- Invoking the Function
- Monitoring
- Function Management
- Dependency Management
- Reserved Instance Management
- Audit
-
FAQs
-
General FAQs
- What Is FunctionGraph?
- Do I Need to Apply for Any Compute, Storage, or Network Services When Using FunctionGraph?
- Do I Need to Deploy My Code After Programming?
- What Runtimes Does FunctionGraph Support?
- How Much Disk Space Is Allocated to Each FunctionGraph Function?
- Does FunctionGraph Support Function Versioning?
- How Does a Function Read or Write Files?
- Does FunctionGraph Support Function Extension?
- Which Permissions Are Required for an IAM User to Use FunctionGraph?
- How Can I Create an ODBC Drive-based Python Dependency Package for Database Query?
- What Is the Quota of FunctionGraph?
- How Does a Container Image–based Function Resolve a Private DNS Domain Name?
- How Do I Use a Domain Name to Access an API Registered with API Gateway (Dedicated)?
- What Are the Common Application Scenarios of FunctionGraph?
- Why Can't the API Gateway Domain Name Bound to a Service Be Resolved During Function Invocation?
- Does FunctionGraph Support Synchronous Transmission at the Maximum Intranet Bandwidth?
- What If the VPC Quota Is Used Up?
- How Can I Print Info, Error, or Warn Logs?
- Can I Set the Domain Name of an API to My Own Domain Name?
- Can I Change the Runtime?
- Can I Change a Function's Name?
- Why Is Message "failed to mount exist system path" Displayed?
- How Do I Obtain Uploaded Files?
- Why Can't I Receive Responses for Synchronous Invocation?
- What Should I Do If the os.system("command &") Execution Logs Are Not Collected?
- Which Directories Can Be Accessed When a Custom Runtime Is Used?
- Which Minor Versions of Python 3.6 and 3.9 Are Supported?
- Which Actions Can Be Used Instead of a VPC Administrator Agency for VPC Access?
- What Are the Possible Causes for Function Timeout?
- How Do I Obtain the Code of a Function?
- Do You Have Sample Code for Initializers?
- How Do I Enable Structured Log Query?
- Can I Enable a Listening Port in a Function to Receive External TCP Requests via EIP?
- Function Creation FAQs
-
Trigger Management FAQs
- What If Error Code 500 Is Reported When Functions that Use APIG Triggers Return Strings?
- What Do LATEST and TRIM_HORIZON Mean in DIS Trigger Configuration?
- Why Can't I Enable or Disable OBS Triggers by Calling APIs?
- How Do I Use an APIG Trigger to Invoke a Function?
- How Does a Function Obtain the Request Path or Parameters When Using an APIG Trigger?
- Can I Create an OBS Trigger with an Existing Bucket?
-
Dependency Management FAQs
- What Is a Dependency?
- When Do I Need a Dependency?
- What Are the Precautions for Using a Dependency?
- What Dependencies Does FunctionGraph Support?
- Does FunctionGraph Support Class Libraries?
- How Do I Use Third-Party Dependencies on FunctionGraph?
- How Do I Create Function Dependencies?
- How Do I Create a Dependency on the FunctionGraph Console?
- How Do I Add a Dependency to a Function?
-
Function Execution FAQs
- How Long Does It Take to Execute a FunctionGraph Function?
- Which Steps Are Included in Function Execution?
- How Does FunctionGraph Process Concurrent Requests?
- What If Function Instances Have Not Been Executed for a Long Time?
- How Can I Speed Up Initial Access to a Function?
- How Do I Know the Actual Memory Used for Function Execution?
- Why Is My First Request Slow?
- What Do I Do If an Error Occurs When Calling an API?
- How Do I Read the Request Header of a Function?
- Why Does a Function Use More Memory Than Estimated and Even Trigger the Out of Memory Alarm?
- How Do I Check the Memory Usage When Seeing "runtime memory limit exceeded"?
- How Do I Troubleshoot "CrashLoopBackOff"?
- After I Updated an Image with the Same Name, Reserved Instances Still Use the Old Image. What Can I Do?
- Function Configuration FAQs
- External Resource Access FAQs
- Other FAQs
-
General FAQs
- Change History
-
API Reference (Kuala Lumpur Region)
- Before You Start
- API Overview
- Calling APIs
- Examples
-
APIs
- Function Invocation
- Function Quotas
- Dependencies
- Test Events
- Function Tracing
-
Function Lifecycle Management
- Querying Functions
- Creating a Function
- Deleting a Function or Function Version
- Querying the Code of a Function
- Modifying the Code of a Function
- Querying the Metadata of a Function
- Modifying the Metadata of a Function
- Updating Max. Instances of a Function
- Enabling or Disabling the Snapshot Function
- Querying Snapshot Status
- Querying Resource Tags
- Querying Resources
- Deleting Resource Tags
- Creating Resource Tags
- Creating a VPC Endpoint
- Deleting a VPC Endpoint
- Versions and Aliases
- Function Metrics
- Function Logs
- Reserved Instances
- Function Import and Export
- Function Triggers
-
Asynchronous Execution Notification
- Querying Asynchronous Execution Notification Settings of a Function Version
- Deleting Asynchronous Execution Notification Settings
- Configuring Asynchronous Execution Notification
- Querying Asynchronous Execution Notification Settings of a Function's All Versions
- Querying Asynchronous Invocation Requests
- Stopping an Asynchronous Invocation Request
- Appendix
- Developer Guide (Kuala Lumpur Region)
-
User Guide (ME-Abu Dhabi Region)
- Videos
- General Reference
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Initializer
Overview
An initializer is a logic entry for initializing functions. For a function with an initializer, FunctionGraph invokes the initializer to initialize the function and then invokes the handler to process function requests. For a function without an initializer, FunctionGraph only invokes the handler to process function requests.
Applicable Scenario
FunctionGraph executes a function in the following steps:
- Allocate container resources to the function.
- Download function code.
- Use the runtime to load the function code.
- Initialize the function.
- Process the function request and return the result.
Steps 1, 2, and 3 are performed during a systematic cold start, ensuring a stable latency through proper resource scheduling and process optimization. Step 4 is performed during an application-layer cold start in complex scenarios, such as loading large models for deep learning, building database connection pools, and loading function dependencies.
To reduce the latency caused by an application-layer cold start, FunctionGraph provides the initializer to identify function initialization logic for proper resource scheduling.
Benefits of the Initializer
- Isolate function initialization and request processing to enable clearer program logic and better structured and higher-performance code.
- Ensure a smooth function upgrade to prevent performance loss during the application layer's cold start initialization. Enable new function instances to automatically execute initialization logic before processing requests.
- Identify the overhead of application layer initialization, and accurately determine the time for resource scaling and the quantity of required resources. This feature makes request latency more stable when the application load increases and more function instances are required.
- If there are continuous requests and the function is not updated, the system may still reclaim or update existing containers. Although no code starts on the platform side, there are cold starts on the service side. The initializer can be used to ensure that requests can be processed properly.
Features of the Initializer
The initializer of each runtime has the following features:
- No custom parameters
The initializer does not support custom parameters and only uses the variables in context for logic processing.
- No return values
- Initialization timeout
You can set an initialization timeout (≤ 300s) different from the timeout for invoking the handler.
- Execution duration
Function instances are processes that execute function logic in a container and automatically scale if the number of requests changes. When a new function instance is generated, the system invokes the initializer and then executes the handler logic if the invocation is successful.
- One-time execution
After each function instance starts, the initializer can only be executed once. If an instance fails to execute the initializer, the instance is abandoned and another instance starts to execute the initializer. A maximum of three attempts are allowed. If the initializer is executed successfully, the instance will only process requests upon invocation and will no longer execute the initializer again within its lifecycle.
- Naming rule
For all runtimes except Java, the initializer can be named in the format of [File name].[Initializer name], which is similar with the format of a handler name. For Java, a class needs to be defined to implement the predefined initializer.
- Billing
The initializer execution duration will be billed at the same rate as the function execution duration.
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