Witnessing strange surge in RDS aurora mysql RDS - spring-boot

Question

I have a springboot based microservice application.
id 'org.springframework.boot' version '2.5.4'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id "com.palantir.docker" version "0.26.0"
id "com.palantir.docker-run" version "0.26.0"
id 'pl.allegro.tech.build.axion-release' version '1.13.2'
Database is mysql5.7 aurora rds
'mysql', name: 'mysql-connector-java', version: '8.0.28'
hikaricp - 4.0.3
I am witnessing one strange surge in cpu utilisation stats on RDS performance insight dashboard is that even when there are no requests on my app server, mysql still shows high cpu utilization.
Here are the screen shots:
we can observe from the logs that there are no requests on server but when the connection passes its max life, surge in cpu utilization on RDS aurora mysql:
"connection has passed maxLifetime" -> and the top sql shows set autocommit = 0 is the highest number of queries being fired.
Here are my configurations:
application.yml
spring:
application:
name: catalogue
profiles:
# The commented value for `active` can be replaced with valid Spring profiles to load.
# Otherwise, it will be filled in by gradle when building the JAR file
# Either way, it can be overridden by `--spring.profiles.active` value passed in the commandline or `-Dspring.profiles.active` set in `JAVA_OPTS`
active: dev
group:
dev:
- dev
- api-docs
# Uncomment to activate TLS for the dev profile
#- tls
prod:
- prod
- api-docs
# Uncomment to activate TLS for the dev profile
#- tls
stage:
- stage
jmx:
enabled: false
data:
web:
pageable:
default-page-size: 20
max-page-size: 20
jpa:
repositories:
bootstrap-mode: deferred
jpa:
open-in-view: false
properties:
hibernate.jdbc.time_zone: UTC
hibernate.id.new_generator_mappings: true
hibernate.connection.provider_disables_autocommit: true #https://vladmihalcea.com/why-you-should-always-use-hibernate-connection-provider_disables_autocommit-for-resource-local-jpa-transactions/
hibernate.cache.use_second_level_cache: true
hibernate.cache.region.factory_class: org.hibernate.cache.ehcache.EhCacheRegionFactory
hibernate.cache.use_query_cache: false
hibernate.javax.cache.missing_cache_strategy: create
# modify batch size as necessary
hibernate.jdbc.batch_size: 20
hibernate.order_inserts: true
hibernate.order_updates: true
hibernate.batch_versioned_data: true
hibernate.query.fail_on_pagination_over_collection_fetch: true
hibernate.query.in_clause_parameter_padding: true
hibernate.dialect: org.hibernate.dialect.MySQL5InnoDBDialect
javax.persistent.sharedCache.mode: ENABLE_SELECTIVE
hibernate:
ddl-auto: none
naming:
physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy
implicit-strategy: org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy
messages:
basename: i18n/messages
main:
allow-bean-definition-overriding: true
task:
execution:
thread-name-prefix: catalogue-task-
pool:
core-size: 2
max-size: 50
queue-capacity: 10000
scheduling:
thread-name-prefix: catalogue-scheduling-
pool:
size: 2
thymeleaf:
mode: HTML
output:
ansi:
console-available: true
server:
servlet:
session:
cookie:
http-only: true
tomcat:
mbeanregistry:
enabled: true
threads:
max: 100
compression:
enabled: true
mime-types: "text/html,text/xml,text/plain,text/css,text/javascript,application/javascript,application/json"
min-response-size: 1024
port: 8080
# Properties to be exposed on the /info management endpoint
info:
# Comma separated list of profiles that will trigger the ribbon to show
display-ribbon-on-profiles: 'dev'
management:
endpoints:
web:
exposure:
include: "health,info,metrics,prometheus"
endpoint:
health:
probes:
enabled: true
show-details: always
show-components: always
application-prod.yml
logging:
level:
ROOT: ERROR
org.hibernate.SQL: ERROR
com.pitstop.catalogue: ERROR
com.zaxxer.hikari: ERROR
config: classpath:logback-prod.xml
spring:
devtools:
restart:
enabled: true
additional-exclude: static/**
jackson:
serialization:
indent-output: true
datasource:
auto-commit: false
type: com.zaxxer.hikari.HikariDataSource
url: ${SPRING_DATASOURCE_URL}
username: ${SPRING_DATASOURCE_USERNAME}
password: ${SPRING_DATASOURCE_PASSWORD}
hikari:
poolName: CatalogJPAHikariCP
minimumIdle: 10
maximumPoolSize: 120
connectionTimeout: 30000
idleTimeout: 300000
maxLifetime: 600000
auto-commit: false
data-source-properties:
cachePrepStmts: true
prepStmtCacheSize: 250
prepStmtCacheSqlLimit: 2048
useServerPrepStmts: true
useLocalSessionState: true
rewriteBatchedStatements: true
cacheResultSetMetadata: true
cacheServerConfiguration: true
maintainTimeStats: true
servlet:
multipart:
location: /data/tmp
jpa:
hibernate:
ddl-auto: none
properties:
spring.jpa.show-sql: true
hibernate.generate_statistics: true
liquibase:
contexts: prod
messages:
cache-duration: PT1S # 1 second, see the ISO 8601 standard
thymeleaf:
cache: false
sleuth:
sampler:
probability: 1 # report 100% of traces