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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-13712) S3A open to avoid needless HEAD on the successful execution path
Date Wed, 02 Nov 2016 18:28:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-13712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Steve Loughran resolved HADOOP-13712.
    Resolution: Won't Fix

> S3A open to avoid needless HEAD on the successful execution path
> ----------------------------------------------------------------
>                 Key: HADOOP-13712
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13712
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.7.3
>            Reporter: Steve Loughran
> S3A's open() operation does a {{getFileStatus()}} check to see if a file is not a directory
before opening with a GET. That initial check will take up at least one HEAD request if the
file is present, more if it isn't.
> As the GET itself performs the existence check, it is needless. A successful GET of a
path which doesn't end in "/" means a file was there. The only reason a getFileStatus call
is needed is to choose which error message to display if the path isn't there: is it an FNFE
or is it path-is-directory.
> Proposed: reorder the code to do the GET; only if that fails fallback to getFileStatus()

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