registry.db doesn't work in S3 subdirectory with Java Feature Server #2239

Expected Behavior

registry.db should be fetched by java feature server in any valid S3 location.

Current Behavior

Java feature server can only fetch registry.db if it is in the root directory of the S3 bucket.

Steps to reproduce

Set registry java config to a nested s3 path such as "s3://bucket/child_directory/registry.db" and the server will throw a "No Such Key" error. However, something like "s3://bucket/registry.db" works.

Specifications

• Version:
• Platform:
• Subsystem:

Possible Solution

The issue seems to be in feast.serving.registry.S3RegistryFile.java lines 35-36:

String[] split = url.replace("s3://", "").split("/");
this.s3Object = this.s3Client.getObject(split[0], split[1]);

The current code splits and uses the element at index 1, which may or may not be the registry.db file. Instead, we should join back the last n-1 elements of the split array. Something like this:

String[] split = url.replace("s3://", "").split("/");
String objectPath = String.join("/", java.util.Arrays.copyOfRange(split, 1, split.length));
this.s3Object = this.s3Client.getObject(split[0], objectPath);