From 1c3b8211ee2b0f1ea3eea11aebd2800e361105ec Mon Sep 17 00:00:00 2001
From: Sumin Hwang <163857590+tnals0924@users.noreply.github.com>
Date: Fri, 24 Jul 2026 23:02:13 +0900
Subject: [PATCH] =?UTF-8?q?chore:=20=EB=8F=99=EC=8B=9C=20=EC=A0=91?=
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- HikariCP 풀 크기 15로 고정, 커넥션 획득 타임아웃 3초로 단축
- max-lifetime 29분 설정으로 MySQL wait_timeout 만료 커넥션 획득 방지
- Tomcat 스레드 최대 100, 대기 큐 100으로 조정
- 배포 시 처리 중 요청 유실 방지를 위한 graceful shutdown 적용

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 src/main/resources/application-dev.yml  | 20 ++++++++++++++++++++
 src/main/resources/application-prod.yml | 22 ++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/src/main/resources/application-dev.yml b/src/main/resources/application-dev.yml
index b8698da..9d8408b 100644
--- a/src/main/resources/application-dev.yml
+++ b/src/main/resources/application-dev.yml
@@ -7,6 +7,15 @@ spring:
     driver-class-name: com.mysql.cj.jdbc.Driver
     username: ${DB_USERNAME}
     password: ${DB_PASSWORD}
+    hikari:
+      pool-name: BillilgeHikariCP
+      maximum-pool-size: 15
+      minimum-idle: 15
+      connection-timeout: 3000
+      validation-timeout: 2000
+      idle-timeout: 600000
+      max-lifetime: 1740000
+      keepalive-time: 300000
 
   security:
     oauth2:
@@ -37,6 +46,17 @@ spring:
       resolve-lazily: true
 
 
+server:
+  tomcat:
+    threads:
+      max: 100
+      min-spare: 20
+    accept-count: 100
+    max-connections: 2000
+    connection-timeout: 5000ms
+  shutdown: graceful
+
+
 jwt:
   secret_key: ${JWT_SECRET_KEY}
   issuer: ${JWT_ISSUER}
diff --git a/src/main/resources/application-prod.yml b/src/main/resources/application-prod.yml
index 30e482e..8774db8 100644
--- a/src/main/resources/application-prod.yml
+++ b/src/main/resources/application-prod.yml
@@ -7,6 +7,17 @@ spring:
     driver-class-name: com.mysql.cj.jdbc.Driver
     username: ${DB_USERNAME}
     password: ${DB_PASSWORD}
+    hikari:
+      pool-name: BillilgeHikariCP
+      # 동접 100 기준: 요청당 DB 점유 시간이 짧아(수십 ms) 커넥션은 적게 유지하는 편이 큐잉/컨텍스트 스위칭에 유리
+      # 웹 요청 + @Async 알림 처리(기본 태스크 풀 8) 여유분까지 포함해 15
+      maximum-pool-size: 15
+      minimum-idle: 15          # 풀 크기 고정 (증감 시 커넥션 생성 지연 방지)
+      connection-timeout: 3000  # 풀 고갈 시 30초 대기 대신 3초 내 fail-fast
+      validation-timeout: 2000
+      idle-timeout: 600000
+      max-lifetime: 1740000     # 29분. MySQL wait_timeout보다 짧게 유지
+      keepalive-time: 300000
 
   security:
     oauth2:
@@ -36,6 +47,17 @@ spring:
       resolve-lazily: true
 
 
+server:
+  tomcat:
+    threads:
+      max: 100        # 동접 100을 동시에 수용. 초과분은 accept-count 큐에서 대기
+      min-spare: 20   # 트래픽 유입 시 스레드 생성 지연 완화
+    accept-count: 100
+    max-connections: 2000
+    connection-timeout: 5000ms
+  shutdown: graceful
+
+
 jwt:
   secret_key: ${JWT_SECRET_KEY}
   issuer: ${JWT_ISSUER}