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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2016/12/09 13:20:58 UTC
[jira] [Created] (HADOOP-13884) s3a create(overwrite=true) to only
look for dir/ and list entries, not file
Steve Loughran created HADOOP-13884:
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Summary: s3a create(overwrite=true) to only look for dir/ and list entries, not file
Key: HADOOP-13884
URL: https://issues.apache.org/jira/browse/HADOOP-13884
Project: Hadoop Common
Issue Type: Sub-task
Components: fs/s3
Affects Versions: 2.9.0
Reporter: Steve Loughran
Priority: Minor
before doing a create(), s3a does a getFileStatus() to make sure there isn't a directory there, and, if overwrite=false, that there isn't a file.
Because S3 caches negative HEAD/GET requests, if there isn't a file, then even after the PUT, a later GET/HEAD may return 404; we are generating create consistency where none need exist.
when overwrite=true we don't care whether the file exists or not, only that the path isn't a directory. So we can just to the HEAD path +"/' and the LIST calls, skipping the {{HEAD path}}. This will save an HTTP round trip of a few hundred millis, and ensure that there's no 404 cached in the S3 front end for later callers
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