c-thiel commented on issue #14762:
URL: https://github.com/apache/iceberg/issues/14762#issuecomment-3631212073

   The strange thing is that Spark seems to use the IO for the table also for 
the Checkpoint.
   
   In Lakekeeper we see a very clear log that states:
   ```
   Received a table specific sign request for table xxx with a location 
s3://xxx/warehouse/019ae372-7eed-75c3-bca2-b35bcd38def0 that does not match the 
request URI 
https://s3.us-west-2.amazonaws.com/xxx/dlh2/spark-checkpoints/iceberg-streaming/bronze_to_silver/my_table/sources/0/offsets/0
   ```
   According to @koombal  the same happens with STS - Spark tries to use the 
vended credentials returned from a LoadTableResponse to use for the Checkpoint 
IO as well - which is again forbidden because the Checkpoint is not in the 
tables location.
   
   @nastra do you know how a Table specific FileIO could leak out and be used 
to store a checkpoint? I tried browsing the Java code but nothing caught my eye.


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