Rust 2026 Tokio 2.0 Async Tasks: B-Tree & LSM Storage Engine Partitioning: Zero-Downtime Data Migration & Dual-Run

// Rust 2026 Tokio 2.0 Async Tasks Production Concurrency Control Pattern
// Topic: B-Tree & LSM Storage Engine Partitioning: Zero-Downtime Data Migration & Dual-Run

async function processResourceWithLease(resourceId, leaseTimeoutMs = 5000) {
  const leaseToken = crypto.randomUUID();
  const acquired = await distributedCoordination.tryAcquire(resourceId, leaseToken, leaseTimeoutMs);
  if (!acquired) {
    throw new ConcurrencyLockError(`Resource ${resourceId} is leased by a competing worker.`);
  }
  try {
    return await executeAtomicMutation(resourceId);
  } finally {
    await distributedCoordination.release(resourceId, leaseToken);
  }
}