Optimize the configuration logic of dn_thrift_max_frame_size

[HTHou]

Description

• Set the default value to 0 and automatically calculate it based on the JVM configuration parameters when DN starts, with the value being min(64MB, dn_alloc_memory / 64)
• if the user manually configures this parameter, the size specified by the user will be prioritized.

[Copilot]

Pull Request Overview

This pull request refactors the Thrift max frame size configuration to use dynamic memory-based defaults and consolidates frame validation error handling.

Key Changes

• Removed hardcoded LEFT_SIZE_IN_REQUEST constant and related validation logic
• Changed default dn_thrift_max_frame_size from 512MB to 0 (dynamic), which calculates as min(64MB, heap memory / 64)
• Refactored frame size validation in TElasticFramedTransport using an enum-based error handling pattern

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
IoTDBConstant.java	Removed unused LEFT_SIZE_IN_REQUEST constant (4MB)
iotdb-system.properties.template	Updated default value to 0 and clarified documentation for dynamic calculation
IoTDBDescriptor.java	Removed minimum frame size validation that enforced 8MB minimum
IoTDBConfig.java	Implemented dynamic calculation of thriftMaxFrameSize based on heap memory, with fallback logic in setter
TElasticFramedTransport.java	Refactored frame validation into checkFrameSize() method with enum-based error handling for better code organization
TCompressedElasticFramedTransport.java	Simplified by delegating frame size validation to parent class's checkFrameSize() method

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[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 84.44444% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.75%. Comparing base (9d4c410) to head (a7b9b83).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
.../org/apache/iotdb/rpc/TElasticFramedTransport.java	84.61%	6 Missing ⚠️
...e/iotdb/rpc/TCompressedElasticFramedTransport.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## master #16724 +/- ##
============================================
- Coverage 38.75% 38.75% -0.01% 
Complexity 207 207 ============================================
Files 5001 5001 Lines 331342 331356 +14 Branches 42103 42102 -1 ============================================
+ Hits 128421 128426 +5 - Misses 202921 202930 +9 

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