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

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

     [ https://issues.apache.org/jira/browse/HADOOP-16879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran resolved HADOOP-16879.
-------------------------------------
    Resolution: Duplicate

> 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
>            Priority: Major
>
> 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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