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https://issues.apache.org/jira/browse/HADOOP-11579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14315927#comment-14315927
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Steve Loughran commented on HADOOP-11579:
-----------------------------------------
+1
Thanks for doing this!
> Documentation for truncate
> --------------------------
>
> Key: HADOOP-11579
> URL: https://issues.apache.org/jira/browse/HADOOP-11579
> Project: Hadoop Common
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 2.7.0
> Reporter: Steve Loughran
> Assignee: Konstantin Shvachko
> Attachments: HADOOP-11579-01.patch, 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 source
> # 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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