Planned lessonMID-017-L02

HikariCP internals

On This Lesson 4 topics

This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.

In this lesson

know how HikariCP lends and manages connections.

HikariCP is the default pool in Spring Boot.
getConnection() takes an idle connection or waits up to connectionTimeout; then it throws.
Connections are validated and retired after maxLifetime (set below any database or proxy limit) and idleTimeout (only relevant when minimumIdle < maximumPoolSize).
close() on a pooled connection returns it to the pool; it does not close the socket.
Metrics (active, idle, pending, timeouts) are exposed through Micrometer.

Draft outline details

yaml

spring:
  datasource:
    hikari:
      maximum-pool-size: 10
      connection-timeout: 3000
      max-lifetime: 1500000

Verify property names and defaults for your Boot version before recording.

What does close() do on a pooled connection?

Show answer

Returns it to the pool.

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