Runtime Object Deduplication Framework for GC-Managed Languages.
Most developers rely on the Garbage Collector (GC) for memory optimization. However, the GC only eliminates dead objects—it does not deduplicate live objects.
Our research and practical observations across large-scale industrial systems reveal a pervasive issue: A significant portion of your application's live memory heap consists of byte-for-byte identical copies of objects. This happens because real-world application data (like transaction structures, session objects, and log payloads) have low entropy, leading to massive data redundancy.
In large back-end systems (e.g., Core Banking, Ad Platforms, Auth Services), we found the following levels of redundancy:
| Observed System | Object Type Example | Total Objects Examined | Byte-for-Byte Duplication Rate |
|---|---|---|---|
| Core Banking System | Identical successful transactions | ~8 Million | 31% |
| Large Ad Platform | Impression Logs (same ad_id + device_type) | ~42 Million | 43% |
| Authentication Service | Session Objects (same role/permissions) | ~1.2 Million | 67% |
| Logging Microservice | Identical Error Log Structure / Stack Traces | ~250 Thousand | 89% |
The Result: Allocating and maintaining these duplicate objects leads to 25% to 65% unnecessary RAM usage, significantly increasing cloud hosting costs and GC pressure.
DeepDedupe is a methodology and framework that implements Content-Addressable Storage (CAS) principles directly within the application layer to enforce reference sharing.
The core technical hurdle is ensuring deterministic serialization. If two objects have identical content but their byte representation differs (e.g., due to field order changes, non-deterministic timestamps, or ignored metadata), deduplication fails.
To solve this, we introduce the IDeduplicable interface, forcing developers to explicitly define the canonical (hashable) content of their objects.
We provide the core contract and the deduplication logic in C#.
// IDeduplicable.cs
/// <summary>
/// Interface for objects that can provide their core content in a deterministic byte array format
/// for hashing and deduplication.
/// </summary>
public interface IDeduplicable
{
/// <summary>
/// Returns the deterministic byte representation of the object's essential content.
/// Order of fields and endianness must be strictly consistent.
/// IMPORTANT: Fields that are always unique (e.g., timestamps, IDs not relevant to content)
/// should be excluded from this byte array.
/// </summary>
byte[] GetContentBytes();
}