steveloughran commented on issue #624: HADOOP-15999. S3Guard: Better support 
for out-of-band operations
URL: https://github.com/apache/hadoop/pull/624#issuecomment-475037885
 
 
   Given I've seen the failure in a standalone run, it's not FS caching somehow 
meaning raw has picked up a DDB table. Though I've added a way to query S3A FS 
instance for its auth status to make sure we know what's going on in inside
   
   Possible causes then
   
   1. writes are so close together they share the same timestamp
   1. the `rawFS.getFileStatus()` call after a read *is picking up the out of 
date value*
   1. the check for modtime is a bit brittle, especially given for all writes 
using different length files, we can just check the file length.
   
   See PR #630 for the patch addressing these issues
   
   @bgaborg to get the changes I've done, look at the "command line 
instructions" at the bottom of the list, add my repo, do a git fetch and then 
cherry pick the commit 5aba1e4738b050fde1b2c45c21ed59320869be53 into this PR
   
   
   

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