Flaky Tests: Orleans.Transactions.AzureStorage.Tests.TransactionConcurrencyTests - Multiple Test Methods

[ReubenBond]

Description

Multiple test methods in the TransactionConcurrencyTests class have been identified as flaky in the CI pipeline.

Affected Tests

1. TransactionChainTest - 6 failures out of 261 runs (97.7% success rate, 0.91s avg duration)
   • Tests a chain of transactions where each is dependent on the results of the previous
2. SingleSharedGrainTest - 4 failures out of 261 runs (98.46% success rate, 0.51s avg duration)
   • Tests two transactions sharing a single grain
3. TransactionTreeTest - 3 failures out of 261 runs (98.85% success rate, 0.43s avg duration)
   • Tests a single transaction containing two grains dependent on two other transactions

Test Details

• Test Class:
• Base Class:
• Test Categories: AzureStorage, Transactions, Functional

Test Description

These tests verify transaction concurrency scenarios including:

• Shared grain access between concurrent transactions
• Sequential transaction dependencies (chain pattern)
• Complex transaction dependencies (tree pattern)

Failure Pattern

The tests show varying failure rates (97.7% to 98.85% success) but all involve transaction concurrency and coordination. The failures may be related to:

• Race conditions in concurrent transaction execution
• Timing issues with transaction dependency resolution
• Azure Storage transaction isolation level conflicts
• Deadlock or livelock scenarios
• Transaction commit/rollback timing

Next Steps

• Investigate transaction concurrency control mechanisms
• Review transaction isolation levels and conflict resolution
• Check for potential deadlock scenarios in test patterns
• Analyze timing sensitivities in transaction coordination
• Consider adding diagnostic logging to capture failure patterns
• Review Azure Storage consistency guarantees for concurrent operations

Related

• Test implementation:
• Test class: