Uniswap Subgraph Incident: The Graph Addresses Service Disruption

A recent technical glitch affected The Graph’s hosted service, causing a delay in data delivery from the Uniswap subgraph, as reported by The Graph Protocol. This disruption impacted applications querying the subgraph, including Uniswap’s informational site, but did not affect the main Uniswap trading platform.

Nature of the Incident

The incident stemmed from an error in The Graph’s hosted service, leading to inconsistencies with Ethereum contract calls and consequently halting the Uniswap subgraph. The disruption was resolved early in the morning, but the data-intensive nature of the subgraph required several hours for node resynchronization and block processing.

Communication with developers was promptly initiated through Discord and Twitter to keep the community informed about the developments. The outage highlighted the importance of decentralizing infrastructure to ensure data reliability and network resilience.

Technical Challenges

The Uniswap subgraph encountered inconsistencies in Ethereum contract calls, causing processing delays. This was compounded by a brief 10-minute outage due to server overload, which saw query loads exceeding 6,000 per second. Following the incident, the service stabilized, processing between 4,000 to 6,000 queries per second.

Future Improvements

The Graph is taking steps to enhance its infrastructure, including leaning on a network of over 200 Indexers from its testnet to provide backup support. This strategy is aimed at increasing Ethereum node diversity and ensuring a higher quality of service.

Additionally, improvements to Graph Node are underway, with efforts to implement contract calls by block hash instead of block number, thus eliminating inconsistent contract call results. This adjustment is supported by the latest Ethereum hard fork.

To bolster its infrastructure, The Graph plans to hire a Site Reliability Engineer in Europe to support its global operations and improve system monitoring. This move is part of the preparation for the mainnet launch later in the year.

Looking Forward

The Graph remains committed to providing reliable public infrastructure to support decentralized and serverless applications. As the DeFi and Web3 spaces continue to grow, The Graph Network aims to be a pivotal data layer, underpinned by a network of Indexers and Curators aligned with the network’s incentives.

For more detailed insights into the incident, visit the official The Graph blog.

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