## What is the purpose of the change Mainly to resolve the unstable test `BlobCacheCleanupTest#testPermanentBlobCleanup`. By replace `BlobUtils#mkdirTolerateExisting` with the same functional（but thread-safe) method `java.nio.file.Files#createDirectories`.
## Verifying this change Verified by passing existing tests, since it is a reinforce. [ Full content available at: https://github.com/apache/flink/pull/6721 ] This message was relayed via gitbox.apache.org for [email protected]
