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https://issues.apache.org/jira/browse/HDFS-6193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13992986#comment-13992986
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Haohui Mai commented on HDFS-6193:
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I don't think this is a blocker since hftp / hsftp have been deprecated and
been superseded by webhdfs. It looks to me that the performance impact is still
up to debate (the same fix has been applied to webhdfs in HDFS-6143, see the
comments for the details).
I'm moving it out to unblock 2.4.1. Feel free to move it back you think it is
essential for the release.
> HftpFileSystem open should throw FileNotFoundException for non-existing paths
> -----------------------------------------------------------------------------
>
> Key: HDFS-6193
> URL: https://issues.apache.org/jira/browse/HDFS-6193
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.4.0
> Reporter: Gera Shegalov
> Assignee: Gera Shegalov
> Priority: Blocker
> Attachments: HDFS-6193-branch-2.4.0.v01.patch,
> HDFS-6193-branch-2.4.v02.patch
>
>
> WebHdfsFileSystem.open and HftpFileSystem.open incorrectly handles
> non-existing paths.
> - 'open', does not really open anything, i.e., it does not contact the
> server, and therefore cannot discover FileNotFound, it's deferred until next
> read. It's counterintuitive and not how local FS or HDFS work. In POSIX you
> get ENOENT on open.
> [LzoInputFormat.getSplits|https://github.com/kevinweil/elephant-bird/blob/master/core/src/main/java/com/twitter/elephantbird/mapreduce/input/LzoInputFormat.java]
> is an example of the code that's broken because of this.
> - On the server side, FileDataServlet incorrectly sends SC_BAD_REQUEST
> instead of SC_NOT_FOUND for non-exitsing paths
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