Github user revans2 commented on a diff in the pull request:

    https://github.com/apache/storm/pull/2871#discussion_r224547803
  
    --- Diff: 
storm-server/src/main/java/org/apache/storm/blobstore/BlobStoreUtils.java ---
    @@ -191,6 +192,8 @@ public static boolean downloadUpdatedBlob(Map<String, 
Object> conf, BlobStore bl
                         out.close();
                     }
                     isSuccess = true;
    +            } catch(FileNotFoundException fnf) {
    +                LOG.warn("FileNotFoundException", fnf);
    --- End diff --
    
    Line 271 of this file is already dealing with the race. so in theory eating 
the FileNotFound or rethrowing it as a KeyNotFound exception should be fine.  I 
am just trying to understand where the FileNotFound is coming from.
    
    The remoteBlobStore should only be getting thrift exceptions.  The only 
place in the code I see that could throw a FileNotFoundException is when we are 
interacting with the local blob, but even then the blobstore code should be 
changing it into a KeyNotFound or some other thrift exception.


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