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From "Steve Loughran (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (HADOOP-13884) s3a create(overwrite=true) to only look for dir/ and list entries, not file
Date Tue, 20 Aug 2019 16:42:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13884?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran reassigned HADOOP-13884:
---------------------------------------

    Assignee: Steve Loughran

> 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
>            Assignee: 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 do 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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