Jiangke Wu created GSOC-297:
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Summary: GSoC 2025 - Apache Seata(Incubating):Unlocking the Power
of Metadata in Apache Seata: From Load Balancing to Advanced Routing
Key: GSOC-297
URL: https://issues.apache.org/jira/browse/GSOC-297
Project: Comdev GSOC
Issue Type: Wish
Reporter: Jiangke Wu
*Synopsis*
Currently, Apache Seata relies on a registry (e.g., Nacos, Zookeeper, Eureka,
Etcd3, Consul, Seata Naming Server) for service discovery and load balancing.
However, the existing registry mechanism lacks support for custom metadata,
which limits the flexibility of client-side load balancing strategies. For
example, clients cannot dynamically adjust traffic distribution based on
server-side metadata such as weight, region, or version. This project aims to
enhance the registry module in Apache Seata by adding metadata support and
enabling clients to implement advanced load balancing strategies based on this
metadata.
h4. *Benefits to Community*
{*}Improved Load Balancing Flexibility{*}: By allowing Seata Server instances
to register custom metadata (e.g., weight, region, version), clients can
implement more sophisticated load balancing strategies, such as weighted
round-robin, zone-aware routing, or version-based routing. This ensures better
resource utilization and improved system performance.
{*}Enhanced Scalability{*}: With metadata-driven load balancing, Seata can
better handle large-scale deployments by distributing traffic more
intelligently across server instances. For example, high-traffic regions can be
assigned more resources, while low-traffic regions can operate with minimal
overhead.
{*}Better Resource Utilization{*}: Metadata such as server weight or capacity
can help clients avoid overloading specific instances, leading to more balanced
resource usage across the cluster.
{*}Extensibility{*}: The addition of metadata support opens the door for future
enhancements, such as dynamic traffic shaping, A/B testing, or canary
deployments.
h4. *Deliverables*
The expected deliverables for this project include:
{*}Registry Metadata Support{*}:
* Extend the registry module (e.g., Nacos, Zookeeper, Eureka, Etcd3, Consul,
Seata Naming Server) to allow Seata Server instances to register custom
metadata (e.g., weight, region, version).
* Ensure backward compatibility with existing registry implementations.
{*}Client-Side Load Balancing Enhancements{*}:
* Implement a metadata-aware load balancing mechanism in the Seata client
(TM/RM).
* Provide built-in load balancing strategies (e.g., weighted random,
zone-aware) and allow users to plug in custom strategies via SPI.
{*}Documentation and Testing{*}:
* Update the Seata documentation to explain how to configure and use metadata
for load balancing.
* Write unit tests and integration tests to validate the new functionality
h4. *Steps Expected*
{*}1.Understand Seata's Registry Mechanism{*}:
* Study how Seata integrates with various registries (e.g., Nacos, Zookeeper,
Eureka, Etcd3, Consul, Seata Naming Server).
* Identify the current limitations in metadata support and load balancing.
{*}2.Extend Registry Module{*}:
* Modify the registry module to allow Seata Server instances to register
custom metadata.
* Ensure the metadata is propagated to clients during service discovery.
{*}3.Implement Metadata-Aware Load Balancing{*}:
* Enhance the client-side load balancing logic to consider metadata (e.g.,
weight, region) when selecting a server instance.
* Provide built-in strategies (e.g., weighted random, zone-aware) and support
custom strategies via SPI.
{*}4.Ensure Compatibility and Performance{*}:
* Test the new functionality with different registry implementations (e.g.,
Nacos, Zookeeper, Eureka, Etcd3, Consul, Seata Naming Server).
* Optimize performance to minimize the overhead of metadata processing.
{*}5.Documentation and Testing{*}:
* Write clear documentation on how to configure and use the new metadata and
load balancing features.
* Develop comprehensive unit tests and integration tests.
h4. *Useful Links*
* [Apache Seata Documentation|https://seata.apache.org/]
* [Nacos |https://nacos.io/]
* [Zookeeper |https://zookeeper.apache.org/]
* [Eureka |https://github.com/Netflix/eureka]
* [Consul|https://www.consul.io/]
* [Etcd3|https://etcd.io/]
* [Seata Naming
Server|https://seata.apache.org/docs/next/user/registry/namingserver]
* [Load Balancing
Strategies|https://en.wikipedia.org/wiki/Load_balancing_(computing)]
h4. *Mentor*
*Mentor: Jiangke Wu, Apache Seata(Incubating) PPMC Member
[xingfude...@apache.org|mailto:jian...@apache.org]*
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