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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-16150) checksumFS doesn't wrap concat(): concatenated files don't have checksums
Date Tue, 05 Mar 2019 22:23:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-16150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16784976#comment-16784976
] 

Steve Loughran commented on HADOOP-16150:
-----------------------------------------

thanks. Sorry, I'd missed the +1; I'd have done the commit myself if I'd noticed.

> checksumFS doesn't wrap concat(): concatenated files don't have checksums
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-16150
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16150
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 3.2.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>             Fix For: 3.3.0
>
>
> Followon from HADOOP-16107. FilterFS passes through the concat operation, and checksum
FS doesn't override that call -so files created through concat *do not have checksums*.
> If people are using a checksummed fs directly with the expectations that they will, that
expectation is not being met. 
> What to do?
> * fail always?
> * fail if checksums are enabled?
> * try and implement the concat operation from raw local up at the checksum level
> append() just gives up always; doing the same for concat would be the simplest. Again,
brings us back to "need a way to see if an FS supports a feature before invocation", here
checksum fs would reject append and concat



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