leventov opened a new pull request #6664: Fix a race in 
FileSessionCredentialsProvider
URL: https://github.com/apache/incubator-druid/pull/6664
 
 
   `sessionToken`, `accessKey` and `secretKey` must be updated atomically.
   
   Another race is possible between the file updater and the Druid process 
reading the file. It could be enforced only with mandatory file locking, but 
file locking is advisory by default in Linux.

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