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https://issues.apache.org/jira/browse/HADOOP-11579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14323804#comment-14323804
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Hudson commented on HADOOP-11579:
---------------------------------
SUCCESS: Integrated in Hadoop-Hdfs-trunk-Java8 #97 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/97/])
HADOOP-11579. Documentation for truncate. Contributed by Konstantin Shvachko.
(shv: rev 6f6737b3bfda0f5c0b0a508dc8523f6636f3f4ab)
* hadoop-common-project/hadoop-common/src/site/markdown/FileSystemShell.md
* hadoop-common-project/hadoop-common/CHANGES.txt
* hadoop-common-project/hadoop-common/src/site/markdown/filesystem/filesystem.md
> 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
> Fix For: 2.7.0
>
> Attachments: HADOOP-11579-01.patch, HADOOP-11579-branch-2.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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