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[MNG-8736] Fix concurrency issue in model building with profile activation #2378

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[MNG-8736] Fix concurrency issue in model building with profile activation #2378

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gnodet
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@gnodet gnodet commented May 22, 2025

JIRA issue: MNG-8736

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cstamas commented May 23, 2025

@wendigo can you verify this fix?

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wendigo commented May 23, 2025

@cstamas i did. Doesn't work

Guillaume Nodet added 2 commits May 26, 2025 17:15
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3ad1dee
Fix MNG-8736: Resolve concurrency issue in file-based profile activation
8649683 
This commit addresses a critical concurrency bug in Maven's profile activation
system where file-based profiles were not being correctly activated in
multi-threaded builds due to a cache hit issue.

## Root Cause Analysis

The issue was in the parent model caching mechanism in DefaultModelBuilder.
When there was a cache hit for a parent model:

1. **Cache MISS (worked correctly):**
   - Called doReadAsParentModel() which activated profiles
   - Called addActivePomProfiles() to record activated profiles in result
   - Profiles appeared in help:active-profiles output

2. **Cache HIT (broken):**
   - Returned cached parent model directly
   - NEVER called addActivePomProfiles()
   - Profiles were activated in the cached model but NOT recorded in result
   - Profiles did NOT appear in help:active-profiles output

## The Fix

Implemented a comprehensive solution using a record to store both the parent
model and its activated profiles in the cache:

### 1. Created ParentModelWithProfiles Record
- Stores both the Model and List<Profile> activatedProfiles
- Ensures activated profiles are preserved across cache operations

### 2. Updated Cache Hit Logic
- When cache hit occurs, extract activated profiles from cached record
- Call addActivePomProfiles() to record them in the result
- Ensures profiles appear in help:active-profiles output

### 3. Updated Cache Miss Logic
- Capture profiles that were activated during doReadAsParentModel()
- Store both model and activated profiles in cache for future hits
- Maintains backward compatibility with existing profile activation flow

### 4. Added Side-Effect-Free Tracing
- Added getModelIdentifierForTracing() method to ProfileActivationContext
- Provides model identification for debugging without recording usage
- Prevents tracing from polluting cache matching logic

## Integration Test

Added comprehensive integration test (MavenITmng8736ConcurrentFileActivationTest):
- Tests 32 child modules with file-based profile activation
- Verifies correct activation under concurrent execution (4 threads)
- Detects both false positives and false negatives
- Provides detailed failure analysis and reporting

## Impact

This fix resolves the concurrency issue where:
- Only 12.5% of modules correctly activated file-based profiles (2 out of 16)
- 87.5% failure rate due to cache hits bypassing profile result recording
- Issue was deterministic based on cache hit patterns, not random race conditions

The solution ensures that file-based profile activation works correctly in
both single-threaded and multi-threaded Maven builds while maintaining
the performance benefits of parent model caching.
@wendigo
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wendigo commented May 27, 2025 •
edited
Loading 

❯ ./mvnw --version
Apache Maven 4.0.0-rc-4-SNAPSHOT (86496837b6b3cd5a05210941917a48427e29e38d)
Maven home: /Users/mateusz.gajewski/.m2/wrapper/dists/apache-maven-4.0.0-rc-4-SNAPSHOT/a25e2747
Java version: 24.0.1, vendor: Eclipse Adoptium, runtime: /Users/mateusz.gajewski/.sdkman/candidates/java/24.0.1-tem
Default locale: pl_PL, platform encoding: UTF-8
OS name: "mac os x", version: "15.3.1", arch: "aarch64", family: "mac"

I'm still getting wrong model from time to time

@wendigo
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wendigo commented May 27, 2025 

❯ ./test.sh 8
+ for x in {1..100}
+ echo -ne '1: '
1: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'wrong model'
wrong model
+ for x in {1..100}
+ echo -ne '2: '
2: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'wrong model'
wrong model
+ for x in {1..100}
+ echo -ne '3: '
3: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'ok model'
ok model
+ for x in {1..100}
+ echo -ne '4: '
4: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'ok model'
ok model
+ for x in {1..100}
+ echo -ne '5: '
5: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'ok model'
ok model
+ for x in {1..100}
+ echo -ne '6: '
6: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'ok model'
ok model
+ for x in {1..100}
+ echo -ne '7: '
7: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'ok model'
ok model
+ for x in {1..100}
+ echo -ne '8: '
8: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'ok model'
ok model
+ for x in {1..100}
+ echo -ne '9: '
9: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'ok model'
ok model
+ for x in {1..100}
+ echo -ne '10: '
10: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'ok model'
ok model
+ for x in {1..100}
+ echo -ne '11: '
11: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class
+ echo 'wrong model'
wrong model
+ for x in {1..100}
+ echo -ne '12: '
12: + ./mvnw -B --offline -e help:effective-pom -pl :flink-loader-query-history-export-job -Dmaven.modelBuilder.parallelism=8
+ grep -q main-class

@wendigo
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wendigo commented May 27, 2025

It also fails during execution:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-enforcer-plugin:3.5.0:enforce (default) on project flink-loader-query-history-export-job: Execution default of goal org.apache.maven.plugins:maven-enforcer-plugin:3.5.0:enforce failed: Failed to find reference POM which defines the current value -> [Help 1]

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3 participants
@gnodet @cstamas @wendigo