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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