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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-16150) checksumFS doesn't wrap concat(): concatenated files don't have checksums
Date Fri, 01 Mar 2019 00:54:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-16150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16781144#comment-16781144
] 

Eric Yang commented on HADOOP-16150:
------------------------------------

+1

> 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
>
> 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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