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Greptile Overview

Greptile Summary

This PR adds a reconnectOnError handler to Redis configuration to handle AWS ElastiCache failover scenarios. When Redis encounters a READONLY error (typically during replica promotion), the client now reconnects using DNS resolution to discover the new master node.

Key Changes:

• Added reconnectOnError handler to standalone Redis configuration
• Added reconnectOnError handler to Redis Cluster configuration
• Added retryDelayOnClusterDown: 300 for cluster mode
• Handles READONLY errors by returning true to trigger reconnection

Note: The Sentinel configuration doesn't include the same reconnect handler, which may be intentional but creates inconsistency across deployment modes.

Confidence Score: 4/5

• This PR is safe to merge with minimal risk
• The implementation follows ioredis documentation patterns for handling ElastiCache failover. The code is simple, focused, and addresses a specific operational issue. Only minor inconsistency noted with Sentinel mode lacking the same handler.
• No files require special attention

Important Files Changed