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- Glossary
- Release Notes and Announcements
- User Guide
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Resource Management
- Permission Management
- Log Collection
- Collection Overview
- Collecting Logs in Self-Built Kubernetes Cluster
- Collecting Syslog
- Collection by LogListener
- Collecting Text Log
- Uploading Log over Kafka
- Uploading Logs via Anonymous Write
- Uploading Logs via Logback Appender
- Uploading Logs via Log4j Appender
- Uploading Log via SDK
- Uploading Log via API
- Importing Data
- Tencent Cloud Service Log Access
- Metric Collection
- Log Storage
- Metric Storage
- Search and Analysis (Log Topic)
- Syntax and Rules
- Statistical Analysis (SQL)
- Quick Analysis
- SQL Syntax
- SQL Functions
- String Function
- Date and Time Functions
- IP Geographic Function
- URL Function
- Mathematical Calculation Functions
- Mathematical Statistical Function
- General Aggregate Function
- Geospatial Function
- Binary String Function
- Estimation Function
- Type Conversion Function
- Logical Function
- Operators
- Bitwise Operation
- Regular Expression Function
- Lambda Function
- Conditional Expressions
- Array Functions
- Interval-Valued Comparison and Periodicity-Valued Comparison Functions
- JSON Functions
- Window Functions
- Sampling Analysis
- Configuring Indexes
- Reindexing
- Context Search and Analysis
- Downloading Log
- Search and Analysis (Metric Topic)
- Dashboard
- Data Processing documents
- Data Processing
- Creating Processing Task
- Viewing Data Processing Details
- Data Processing Functions
- Function Overview
- Key-Value Extraction Functions
- Enrichment Functions
- Flow Control
- Row Processing Functions
- Field Processing Functions
- Value Structuring Functions
- Regular Expression Processing Functions
- Time Value Processing Functions
- String Processing Functions
- Type Conversion Functions
- Logical and Mathematical Functions
- Encoding and Decoding Functions
- IP Parsing Functions
- Processing Cases
- Scheduled SQL Analysis
- SCF
- Data Processing
- Shipping and Consumption
- Monitoring Alarm
- Historical Documentation
- Practical Tutorial
- Developer Guide
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Topic Management APIs
- Log Set Management APIs
- Index APIs
- Topic Partition APIs
- Machine Group APIs
- Collection Configuration APIs
- Log APIs
- Metric APIs
- Alarm Policy APIs
- Data Processing APIs
- Kafka Protocol Consumption APIs
- CKafka Shipping Task APIs
- Kafka Data Subscription APIs
- COS Shipping Task APIs
- SCF Delivery Task APIs
- Scheduled SQL Analysis APIs
- COS Data Import Task APIs
- Data Types
- Error Codes
- FAQs
- CLS Service Level Agreement
- CLS Policy
- Contact Us
- Glossary
Use Case
Tom has collected logs to in nested JSON format to CLS. Now he wants to extract the user (secondary nested field) and App fields from the logs.
Raw Log
[{"content": {"App": "App-1","start_time": "2021-10-14T02:15:08.221","resonsebody": {"method": "GET","user": "Tom"},"response_code_details": "3000","bytes_sent": 69}},{"content": {"App": "App-2","start_time": "2222-10-14T02:15:08.221","resonsebody": {"method": "POST","user": "Jerry"},"response_code_details": "2222","bytes_sent": 1}}]
DSL Processing Function
Option 1. Use the JMES formula to extract fields directly without expanding all key-value pairs
ext_json_jmes("content", jmes="resonsebody.user", output="user")ext_json_jmes("content", jmes="App", output="App")
Option 2. Expand all key-value pairs and discard unwanted fields
ext_json("content")fields_drop("content")fields_drop("bytes_sent","method","response_code_details","start_time")
DSL Processing Function Details
Option 1:
1. Use the JMES formula resonsebody.user to directly specify the secondary nested field user.
ext_json_jmes("content", jmes="resonsebody.user", output="user")
2. Use the JMES formula App to directly specify the App field.
ext_json_jmes("content", jmes="App", output="App")
Option 2:
1. Use the ext_json function to extract structured data from the JSON data. All fields are expanded by default.
ext_json("content")
2. Discard the content field.
fields_drop("content")
3. Discard the unwanted fields bytes_sent, method, response_code_details, and start_time.
fields_drop("bytes_sent","method","response_code_details","start_time")
Processing Result
[{"App":"App-1","user":"Tom"},{"App":"App-2","user":"Jerry"}]
Yes
No
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