[jira] [Commented] (HADOOP-17415) Use S3 content-range header to update length of an object during reads

["Monthon Klongklaew (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-17415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17477858#comment-17477858 ] 

Monthon Klongklaew commented on HADOOP-17415:
---------------------------------------------

Need more information about this one.

We can get the object length and update it on first read, but how can we determine if it is a file or directory without a probe?

From what I see, an exception is expected when using openFile against a directory.

> Use S3 content-range header to update length of an object during reads
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-17415
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17415
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.3.0
>            Reporter: Steve Loughran
>            Priority: Major
>
> As part of all the openFile work, knowing full length of an object allows for a HEAD to be skipped. But: code knowing only the splits don't know the final length of the file.
> If the content-range header is used, then as soon as a single GET is initiated against an object, if the field is returned then we can update the length of the S3A stream to its real/final length
> Also: when any input stream fails with an EOF exception, we can distinguish stream-interrupted from "no, too far"



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