Memory leak in MediaType.parseMediaType()

[radhakrishnanch]

We have 40 VMs (8 core, 27 GB RAM) running with Spring Webflux (version given below). Randomly facing performance issue at 2-5 VMs i.e. normal response time is 3-10 ms and in the problematic VMs response time is ~1000 ms.

I have analysed the API flow with Dynatrace and found that performance issue at MediaType.parseMediaType(), more than 75% of the response time contribution is from MediaType.parseMediaType.

Spring WebFlux Version

io.projectreactor reactor-bom Dysprosium-SR4 pom import

Embedded Server:

org.springframework.boot spring-boot-starter-jetty ${spring-boot.version}

[radhakrishnanch]

Dynatrace snapshot

[radhakrishnanch]

Thread Dump

thread_dump.txt

[radhakrishnanch]

Heap Dump -

I could see java.util.concurrent.ConcurrentLinkedQueue inside MimeTypeUtils.cachedMimeTypes consumes 37.12mb. This queue contains 1,621,030 items. I assume this is the root cause of the slowness.

All items inside the queue are null

Heap Dump is uploaded at Google Drive https://drive.google.com/file/d/1tTqw2brE6RaNb8LLtOzLxM7H6bPkXFt_/view?usp=sharing

[bclozel]

Which Spring Framework version are you using?

[bclozel]

This looks like a duplicate of #24886

[radhakrishnanch]

Which Spring Framework version are you using?

Spring Boot 2.2.4.RELEASE

[radhakrishnanch]

#24886

I could see we have a StringUtils.hasLength(mimeType) check before adding the value to the cache. Still how the null values are added to the queue?

[bclozel]

Spring Boot 2.2.4 depends on Spring Framework 5.2.3. I think this issue is a duplicate of #24886 and I’ll close it as one.

Please upgrade to Spring Boot 2.2.7 or override the Spring Framework version to 5.2.6 in the Spring Boot dependency management.

Thanks!