Steve Loughran commented on HADOOP-6688:

# the original s3:// impl is gone in trunk
# s3a does check for this, and we have tests. 

For that reason, I'm going to close as a cannot reproduce. But Yes, Danny is 
correct: delete() must never raise FNFE.

> FileSystem.delete(...) implementations should not throw FileNotFoundException
> -----------------------------------------------------------------------------
>                 Key: HADOOP-6688
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6688
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs, fs/s3
>    Affects Versions: 0.20.2
>         Environment: Amazon EC2/S3
>            Reporter: Danny Leshem
>            Priority: Minor
> S3FileSystem.delete(Path path, boolean recursive) may fail and throw a 
> FileNotFoundException if a directory is being deleted while at the same time 
> some of its files are deleted in the background.
> This is definitely not the expected behavior of a delete method. If one of 
> the to-be-deleted files is found missing, the method should not fail and 
> simply continue. This is true for the general contract of FileSystem.delete, 
> and also for its various implementations: RawLocalFileSystem (and 
> specifically FileUtil.fullyDelete) exhibits the same problem.
> The fix is to silently catch and ignore FileNotFoundExceptions in delete 
> loops. This can very easily be unit-tested, at least for RawLocalFileSystem.
> The reason this issue bothers me is that the cleanup part of a long (Mahout) 
> MR job inconsistently fails for me, and I think this is the root problem. The 
> log shows:
> {code}
> java.io.FileNotFoundException: 
> s3://S3-BUCKET/tmp/0008E25BF7554CA9/2521362836721872/DistributedMatrix.times.outputVector/_temporary/_attempt_201004061215_0092_r_000002_0/part-00002:
>  No such file or directory.
>       at 
> org.apache.hadoop.fs.s3.S3FileSystem.getFileStatus(S3FileSystem.java:334)
>       at 
> org.apache.hadoop.fs.s3.S3FileSystem.listStatus(S3FileSystem.java:193)
>       at org.apache.hadoop.fs.s3.S3FileSystem.delete(S3FileSystem.java:303)
>       at org.apache.hadoop.fs.s3.S3FileSystem.delete(S3FileSystem.java:312)
>       at 
> org.apache.hadoop.mapred.FileOutputCommitter.cleanupJob(FileOutputCommitter.java:64)
>       at 
> org.apache.hadoop.mapred.OutputCommitter.cleanupJob(OutputCommitter.java:135)
>       at org.apache.hadoop.mapred.Task.runJobCleanupTask(Task.java:826)
>       at org.apache.hadoop.mapred.MapTask.run(MapTask.java:292)
>       at org.apache.hadoop.mapred.Child.main(Child.java:170)
> {code}
> (similar errors are displayed for ReduceTask.run)

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