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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7665) Add definition of truncate preconditions/postconditions to filesystem specification
Date Tue, 10 Feb 2015 20:18:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7665?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Konstantin Shvachko updated HDFS-7665:
    Attachment: HDFS-7665.patch

This are changes to the documentation related to truncate.
All changes are in hadoop-common. So it would make sense to convert this to a HADOOP issue.

> Add definition of truncate preconditions/postconditions to filesystem specification
> -----------------------------------------------------------------------------------
>                 Key: HDFS-7665
>                 URL: https://issues.apache.org/jira/browse/HDFS-7665
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: documentation
>    Affects Versions: 3.0.0
>            Reporter: Steve Loughran
>             Fix For: 3.0.0
>         Attachments: HDFS-7665.patch
> With the addition of a major new feature to filesystems, the filesystem specification
in hadoop-common/site is now out of sync. 
> This means that
> # there's no strict specification of what it should do
> # you can't derive tests from that specification
> # other people trying to implement the API will have to infer what to do from the HDFS
> # there's no way to decide whether or not the HDFS implementation does what it is intended.
> # without matching tests against the raw local FS, differences between the HDFS impl
and the Posix standard one won't be caught until it is potentially too late to fix.
> The operation should be relatively easy to define (after a truncate, the files bytes
[0...len-1] must equal the original bytes, length(file)==len, etc)
> The truncate tests already written could then be pulled up into contract tests which
any filesystem implementation can run against.

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