[jira] [Assigned] (HADOOP-18657) Tune ABFS create() retry logic

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

     [ https://issues.apache.org/jira/browse/HADOOP-18657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran reassigned HADOOP-18657:
---------------------------------------

    Assignee: Steve Loughran

> Tune ABFS create() retry logic
> ------------------------------
>
>                 Key: HADOOP-18657
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18657
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/azure
>    Affects Versions: 3.3.5
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>
> Based on experience trying to debug this happening
> # add debug statements when create() fails
> # generated exception text to reference string shared with tests, path and error code
> # generated exception to include inner exception for full stack trace
> Currently the retry logic is
> # create(overwrite=false)
> # if HTTP_CONFLICT/409 raised; call HEAD
> # use etag in create(path, overwrite=true, etag)
> # special handling of error HTTP_PRECON_FAILED = 412
> There's a race condition here, which is if between 1 and 2 the file which exists is deleted. The retry should succeed, but currently a 404 from the head is escalated to a failure
> proposed changes
> # if HEAD is 404, leave etag == null and continue
> # special handling of 412 also to handle 409



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