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https://issues.apache.org/jira/browse/HDFS-711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408402#comment-13408402
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Colin Patrick McCabe commented on HDFS-711:
-------------------------------------------
Unfortunately the decision was made to use time_t as the parameter for
hdfsUtime. That type is sometimes signed, and sometimes unsigned, so it
doesn't really make sense to require users to pass -1, in my opinion. (It
would work on modern versions of Linux, though.) (The use of time_t causes
other problems-- it is only 32 bit on 32-bit Linux systems, for example.)
It would be nice to have a better API that exposed the true resolution of the
HDFS utime (currently we're limited to seconds only, whereas HDFS tracks
milliseconds.) However, that's a separate issue, I think...
> hdfsUtime does not handle atime = 0 or mtime = 0 correctly
> ----------------------------------------------------------
>
> Key: HDFS-711
> URL: https://issues.apache.org/jira/browse/HDFS-711
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: documentation
> Affects Versions: 0.20.1
> Reporter: freestyler
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-711.001.patch
>
>
> in HADOOP/src/c++/libhdfs/hdfs.h
> The following function document is incorrect:
> /* @param mtime new modification time or 0 for only set access time in
> seconds
> @param atime new access time or 0 for only set modification time in
> seconds
> */
> int hdfsUtime(hdfsFS fs, const char* path, tTime mtime, tTime atime);
> Currently, setting mtime or atime to 0 has no special meaning. That is, file
> last modified time will change to 0 if the mtime argument is 0.
> libhdfs should translate mtime = 0 or atime = 0 to the special value -1,
> which in HDFS means "don't change this time."
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