Parallelize history migration with configurable exponential backoff per entity type #397

Copilot · 2025-11-19T08:12:35Z

Description

History migration now runs each entity type (process definitions, instances, flow nodes, tasks, variables, incidents, decisions) in parallel threads. Each thread polls for new work, backs off exponentially when idle, and exits after consecutive empty iterations. MIGRATE mode runs to completion before RETRY_SKIPPED begins.

Changes:

migrate() now calls runParallelMigration() sequentially for MIGRATE then RETRY_SKIPPED modes
runParallelMigration() spawns 9 threads via ExecutorService, one per entity type
createMigrationTask() wraps migration methods with work detection (timestamp comparison) and exponential backoff logic
Thread coordination via CountDownLatch, proper cleanup in finally blocks
Configurable parameters: Added max-suspensions, initial-backoff-ms, and backoff-multiplier to MigratorProperties for flexible tuning
ThreadLocal exception context: Each worker thread properly sets and clears ExceptionContext.HISTORY for correct exception handling and logging
Null-safe property getters: Property getters return defaults if values are null, preventing NPE in test contexts

Implementation:

// Before: sequential execution
public void migrate() {
  migrateProcessDefinitions();
  migrateProcessInstances();
  // ... 7 more sequential calls
}

// After: parallel with configurable backoff
public void migrate() {
  runParallelMigration(MIGRATE);        // All 9 entities in parallel
  runParallelMigration(RETRY_SKIPPED);  // All 9 entities in parallel
}

Work detection compares findLatestCreateTimeByType() before/after each migration call. Changed timestamp = work done, reset counter. Unchanged = increment suspension counter, apply backoff.

Thread safety verified: Spring-managed singletons (DbClient, C7Client), stateless MyBatis mappers, stateless converters. Each worker thread manages its own ThreadLocal exception context.

Configuration:

The following properties can be configured in application.yml or application.properties:

camunda:
  migrator:
    max-suspensions: 3           # Number of consecutive idle iterations before thread exits (default: 3)
    initial-backoff-ms: 100      # Initial backoff duration in milliseconds (default: 100)
    backoff-multiplier: 2.0      # Exponential backoff multiplier (default: 2.0)

Or in properties format:

camunda.migrator.max-suspensions=3
camunda.migrator.initial-backoff-ms=100
camunda.migrator.backoff-multiplier=2.0

Related issues

closes #

Original prompt

In the history data migrator, parallelize migration for each entity. I.e., each method in the migrate method runs in its own thread. Threads are suspended with an exponential backoff when there is nothing left to do. Run the migration first, and then retry the skipped tasks. Exit all threads and stop the migrator when there is no further work to be done. I.e., all threads have been suspended multiple times.

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tasso94 · 2025-11-19T10:44:00Z

@copilot, make the following hard coded values configurable:

    final int maxSuspensions = 3; // Number of times a thread must be suspended before stopping
    final long initialBackoffMs = 100; // Initial backoff duration
    final double backoffMultiplier = 2.0; // Exponential backoff multiplier

Copilot · 2025-11-19T10:49:59Z

@copilot, make the following hard coded values configurable:
    final int maxSuspensions = 3; // Number of times a thread must be suspended before stopping

...

Done! The values are now configurable via MigratorProperties:

camunda.migrator.max-suspensions (default: 3)
camunda.migrator.initial-backoff-ms (default: 100)
camunda.migrator.backoff-multiplier (default: 2.0)

Commit: dcc9e88

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tasso94 · 2025-11-19T15:43:25Z

@copilot, fix failing tests.

Copilot · 2025-11-19T15:51:56Z

@copilot, fix failing tests.

Fixed! The issues were:

ThreadLocal exception context not set in worker threads - Each migration thread now properly sets ExceptionUtils.setContext(ExceptionContext.HISTORY) at startup and clears it on completion (commit: 1a78b22)
Potential NPE from null property values - Added null-safe getters that return defaults if properties are null (commit: d235a36)

These changes ensure proper exception handling and logging in parallel execution, and prevent NullPointerExceptions in test contexts where properties might not be fully initialized.

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If you need me to access, download, or install something from one of these locations, you can either:

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- Add null-safe getters for parallel migration properties - Make parallel migration parameters configurable via properties - Implement parallel migration with exponential backoff

Copilot AI assigned Copilot and tasso94 Nov 19, 2025

Copilot started work on behalf of tasso94 November 19, 2025 08:15 View session

Copilot AI changed the title ~~[WIP] Add parallelization to history data migration~~ Parallelize history migration with exponential backoff per entity type Nov 19, 2025

Copilot AI requested a review from tasso94 November 19, 2025 08:30

Copilot finished work on behalf of tasso94 November 19, 2025 08:30

Copilot started work on behalf of tasso94 November 19, 2025 10:44 View session

Copilot AI changed the title ~~Parallelize history migration with exponential backoff per entity type~~ Parallelize history migration with configurable exponential backoff per entity type Nov 19, 2025

Copilot finished work on behalf of tasso94 November 19, 2025 10:52

tasso94 force-pushed the copilot/parallelize-migration-threads branch from dcc9e88 to 594b228 Compare November 19, 2025 13:26

Copilot started work on behalf of tasso94 November 19, 2025 15:43 View session

Copilot finished work on behalf of tasso94 November 19, 2025 15:56

- Set ExceptionContext in worker threads for proper error handling

8841318

- Add null-safe getters for parallel migration properties - Make parallel migration parameters configurable via properties - Implement parallel migration with exponential backoff

tasso94 force-pushed the copilot/parallelize-migration-threads branch from 1a78b22 to 8841318 Compare December 2, 2025 07:10

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