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Hadoop, mail # user - how to get the time of a hadoop cluster, v0.20.2


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Re: how to get the time of a hadoop cluster, v0.20.2
Niels Basjes 2013-05-16, 15:34
If you make sure that everything uses NTP then this becomes an irrelevant
distinction.
On Thu, May 16, 2013 at 4:01 PM, Jane Wayne <[EMAIL PROTECTED]>wrote:

> yes, but that gets the current time on the server, not the hadoop cluster.
> i need to be able to probe the date/time of the hadoop cluster.
>
>
> On Tue, May 14, 2013 at 5:09 PM, Niels Basjes <[EMAIL PROTECTED]> wrote:
>
> > I made a typo. I meant API (instead of SPI).
> >
> > Have a look at this for more information:
> >
> >
> http://stackoverflow.com/questions/833768/java-code-for-getting-current-time
> >
> >
> > If you have a client that is not under NTP then that should be the way to
> > fix your issue.
> > Once you  have that getting the current time is easy.
> >
> > Niels Basjes
> >
> >
> >
> > On Tue, May 14, 2013 at 5:46 PM, Jane Wayne <[EMAIL PROTECTED]
> > >wrote:
> >
> > > niels,
> > >
> > > i'm not familiar with the native java spi. spi = service provider
> > > interface? could you let me know if this spi is part of the hadoop
> > > api? if so, which package/class?
> > >
> > > but yes, all nodes on the cluster are using NTP to synchronize time.
> > > however, the server (which is not a part of the hadoop cluster)
> > > accessing/interfacing with the hadoop cluster cannot be assumed to be
> > > using NTP. will this still make a difference? and actually, this is
> > > the primary reason why i need to get the date/time of the hadoop
> > > cluster (need to check if the date/time of the hadooop cluster is in
> > > sync with the server).
> > >
> > >
> > >
> > > On Tue, May 14, 2013 at 11:38 AM, Niels Basjes <[EMAIL PROTECTED]>
> wrote:
> > > > If you have all nodes using NTP then you can simply use the native
> Java
> > > SPI
> > > > to get the current system time.
> > > >
> > > >
> > > > On Tue, May 14, 2013 at 4:41 PM, Jane Wayne <
> [EMAIL PROTECTED]
> > > >wrote:
> > > >
> > > >> hi all,
> > > >>
> > > >> is there a way to get the current time of a hadoop cluster via the
> > > >> api? in particular, getting the time from the namenode or jobtracker
> > > >> would suffice.
> > > >>
> > > >> i looked at JobClient but didn't see anything helpful.
> > > >>
> > > >
> > > >
> > > >
> > > > --
> > > > Best regards / Met vriendelijke groeten,
> > > >
> > > > Niels Basjes
> > >
> >
> >
> >
> > --
> > Best regards / Met vriendelijke groeten,
> >
> > Niels Basjes
> >
>

--
Best regards / Met vriendelijke groeten,

Niels Basjes