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From "Dhruba Borthakur" <dhr...@gmail.com>
Subject Re: File Modification timestamp
Date Fri, 09 Jan 2009 05:58:24 GMT
Hi sandeep,

This should have worked. Please look at a sample program that used
modification time /src/test/org/apache/hadoop/hdfs/TestModTime.java.

If you can write any sort of test that demonstrates the exact problem you
are seeing, it will help in debugging.

thanks,
dhruba


On Tue, Dec 30, 2008 at 11:35 PM, Sandeep Dhawan <dsandeep@hcl.in> wrote:

>
> Hi Dhruba,
>
> The file is being closed properly but the timestamp does not get modified.
> The modification timestamp
> still shows the file creation time.
> I am creating a new file and writing data into this file.
>
> Thanks,
> Sandeep
>
>
> Dhruba Borthakur-2 wrote:
> >
> > I believe that file modification times are updated only when the file is
> > closed. Are you "appending" to a preexisting file?
> >
> > thanks,
> > dhruba
> >
> >
> > On Tue, Dec 30, 2008 at 3:14 AM, Sandeep Dhawan <dsandeep@hcl.in> wrote:
> >
> >>
> >> Hi,
> >>
> >> I have a application which creates a simple text file on hdfs. There is
> a
> >> second application which processes this file. The second application
> >> picks
> >> up the file for processing only when the file has not been modified for
> >> 10
> >> mins. In this way, the second application is sure that this file is
> ready
> >> for processing.
> >>
> >> But, what is happening is that the Hadoop is not updating the
> >> modification
> >> timestamp of the file even when the file is being written into. The
> >> modification timestamp of the file is same as the timestamp when the
> file
> >> was created.
> >>
> >> I am using hadoop 0.18.2.
> >>
> >> 1. Is this a bug in hadoop or is this way hadoop works
> >> 2. Is there way by which I can programmitically set the modification
> >> timestamp of the file
> >>
> >> Thanks,
> >> Sandeep
> >>
> >> --
> >> View this message in context:
> >>
> http://www.nabble.com/File-Modification-timestamp-tp21215824p21215824.html
> >> Sent from the Hadoop core-user mailing list archive at Nabble.com.
> >>
> >>
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/File-Modification-timestamp-tp21215824p21228299.html
> Sent from the Hadoop core-user mailing list archive at Nabble.com.
>
>

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