ADLSFileIO cache DefaultAzureCredentials?

[lkindere]

Query engine

Iceberg REST catalog

Question

Currently it looks like when using ADLSFileIO for every request it creates a new client, which then calls

iceberg/azure/src/main/java/org/apache/iceberg/azure/adlsv2/ADLSFileIO.java

Line 114 in e3f3997

azureProperties.applyClientConfiguration(location.storageAccount(), clientBuilder);

which then ends up creating a new AzureDefaultCredential:

iceberg/azure/src/main/java/org/apache/iceberg/azure/AzureProperties.java

Line 88 in e3f3997

builder.credential(new DefaultAzureCredentialBuilder().build());

Problem with this is that for every single time we have a request, a new token has to be fetched using the AZURE_TENANT_ID, AZURE_CLIENT_ID, AZURE_CLIENT_SECRET
Which I assume would have a performance impact and create a lot of unnecessary requests for the tokens.

Why is there no option to reuse the created DefaultAzureCredentials to utilize default caching?
Am I missing something or is this simply not implemented?