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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-20338) LLAP: Force synthetic file-id for filesystems which have HDFS protocol impls with POSIX mutation semantics
Date Mon, 27 Aug 2018 22:53:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-20338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16594313#comment-16594313
] 

Sergey Shelukhin commented on HIVE-20338:
-----------------------------------------

Heh, so it basically becomes an "is HDFS" config. +1

> LLAP: Force synthetic file-id for filesystems which have HDFS protocol impls with POSIX
mutation semantics
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-20338
>                 URL: https://issues.apache.org/jira/browse/HIVE-20338
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Major
>         Attachments: HIVE-20338.1.patch, HIVE-20338.WIP.patch, HIVE-20338.patch
>
>
> HDFS client protocol is not a guarantee of the immutability of files - the synthetic
file-id includes the mtime of the file as well, which is a fail-safe for filesystems which
implement the client wire protocol without offering the same storage side restrictions on
immutability (i.e allow NFS read-write-modify on the backend).



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