[jira] [Created] (HADOOP-16879) s3a mkdirs() to not check dest for a dir marker

["Steve Loughran (Jira)" <ji...@apache.org>]

Steve Loughran created HADOOP-16879:
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             Summary: s3a mkdirs() to not check dest for a dir marker
                 Key: HADOOP-16879
                 URL: https://issues.apache.org/jira/browse/HADOOP-16879
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: fs/s3
    Affects Versions: 3.2.1
            Reporter: Steve Loughran


S3A innerMkdirs() calls getFileStatus() to probe dest path for being a file or dir, then goes to reject/no-op.


The HEAD path + / in that code may add a 404 to the S3 load balancers, so subsequent probes for the path fail. 

Proposed: only look for file then LIST underneath

if no entry found: probe for parent being a dir (LIST; HEAD + /), if true create the marker entry. If not, start the walk (or should we then check?)

This increases the cost of mkdir on an existing empty dir marker; reduces it on a non-empty dir. Creates dir markers above dir markers to avoid those cached 404s.




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