Cross-Shard Transactions in Graph Databases

1. Introduction

Cross-shard transactions are essential for maintaining data consistency in distributed graph databases that use sharding to partition data across different nodes or shards. This lesson will cover the intricacies of executing transactions that span multiple shards while ensuring ACID (Atomicity, Consistency, Isolation, Durability) properties.

2. Key Concepts

3. Step-by-Step Process

Executing cross-shard transactions typically involves the following steps:

3.1 Example Code Snippet

function executeCrossShardTransaction(transactionData) {
    const shards = identifyShards(transactionData);
    let transactionPromises = shards.map(shard => beginTransaction(shard));

    Promise.all(transactionPromises)
        .then(results => {
            results.forEach((result, index) => {
                performOperations(shards[index], result, transactionData);
            });
            return commitTransactions(shards);
        })
        .catch(error => {
            rollbackTransactions(shards);
            console.error("Transaction failed:", error);
        });
}

4. Best Practices

To effectively manage cross-shard transactions, consider the following best practices:

5. FAQ