Description

In 24-h NFT Transfer test, file-descriptor leak was identified:
2196 /opt/hgcapp/services-hedera/HapiApp2.0/data/saved/com.hedera.services.ServicesMain/7/123
The dir opened 2196 times and keeps open - that will cause error: too many open files.

In context of previously fixed issues, the ticket
#5533 is closest to describe the issue and to suggest the fix

Found 3 suspects:
./platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/state/snapshot/SignedStateFilePath.java:197: final List dirs = Files.list(dir).filter(Files::isDirectory).toList();
./platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/gui/internal/StateHierarchy.java:52: final List appFiles = rethrowIO(() -> Files.list(appsDirPath)
./platform-sdk/swirlds-platform-core/src/main/java/com/swirlds/platform/gui/internal/StateHierarchy.java:59: final List toDelete = rethrowIO(() -> Files.list(appsDirPath)

Steps to reproduce

Run NFT transfer for sufficiently long time and watch for number:
ls -l /proc/<JAVA_PID>/fd/* | grep 'data/saved/com.hedera.services.ServicesMain' | wc -l

This number must be small (single-digit) and should not grow over time.

Additional context

No response

Hedera network

No response

Version

v0.54

Operating system

Linux