Claude Code
database
Redis Connection Pool Exhaustion
Application gradually exhausts Redis connection pool over hours. New connections fail with 'pool exhausted' error. Existing connections aren't being returned to the pool properly, causing connection leak.
Redis works initially but degrades as connections accumulate.
Error Messages You Might See
redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
Connection pool exhausted
Redis connection timeout
Common Causes
- Connections not returned to pool (not closed after use)
- Connection pool size too small for concurrent load
- Long-running operations holding connections
- Connection timeout not configured, dead connections not removed
- Blocking calls (BLPOP) holding connections indefinitely
How to Fix It
Use try-with-resources to ensure connections closed: try (Connection c = pool.getConnection()) { }. Increase pool size if needed. Configure connection timeout and idle timeout to clean up dead connections. Use connection monitoring: log pool size periodically. Avoid blocking operations that hold connections. Use Redis Cluster/Sentinel for failover.
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Get HelpFrequently Asked Questions
How to properly use Redis connections?
try (Jedis jedis = pool.getResource()) { jedis.set(...); } - try-with-resources auto-closes connection.
What pool size should be used?
Start with: max threads × 2. Monitor actual usage. Typical: 5-20 connections. Monitor metrics to right-size.
How to detect connection leaks?
Monitor pool: pool.getResource() count should stay constant. If climbs, connections not being returned.