karuppayya commented on PR #4309:
URL: 
https://github.com/apache/datafusion-comet/pull/4309#issuecomment-4521960402

   I guess the JNI call to `getCredentialsForPath` runs through the Comet tokio 
runtime, which is sized at `spark.executor.cores` worker threads. The call 
seems to be synchronous.
   Since the call duration is non-deterministic and entirely controlled by the 
vendor's implementation, this can potentially block unrelated work on the 
runtime today and as the system grows. Do you think this is an issue?
   
   That said, the current shape is a reasonable starting point . We can keeping 
refining in subsqeuent PRs.


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