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Hadoop >> mail # dev >> What's the status of IPv6 support?


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Andrew Pennebaker 2013-08-16, 15:27
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Eli Collins 2013-08-16, 16:44
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Andrew Pennebaker 2013-08-16, 17:05
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Steve Loughran 2013-08-16, 17:16
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Re: What's the status of IPv6 support?
On Friday, August 16, 2013, Steve Loughran wrote:

> On 16 August 2013 10:05, Andrew Pennebaker <[EMAIL PROTECTED]<javascript:;>>
> wrote:
>
> > Thanks for the link!
> >
> > I understand a lack of support *for* IPv6, what I don't understand is why
> > IPv6 must be disabled in order for Hadoop to work. On systems with both
> > IPv4 and IPv6, I thought IPv4 apps could ignore IPv6 as if it weren't
> > available. I suppose that's not quite right.
> >
>
>
> historically the JVM IPv6 support on Linux has been pretty troublesome -I
> don't know if it's better now, because we all avoid it.
>
> I'm not sure you have to disable it as long as all java processes get
> started with "-Djava.net.preferIPv4Stack=true" as a JVM arg
That's correct, I've run Hadoop clusters with ipv6 enabled using these
options (they were checked in by default awhile back).

>
> If you don't say that then the JVM keeps trying to create sockets at the
> IPv6 level and then fallback to IPv4 if it can't connect, which adds
> overhead to all connections.
>
> -steve
>
>
> >
> > On Fri, Aug 16, 2013 at 12:44 PM, Eli Collins <[EMAIL PROTECTED]<javascript:;>>
> wrote:
> >
> > > Hey Andrew,
> > >
> > > I'm not aware of anyone working on IPv6 support.
> > >
> > > The following looks up to date and may be helpful:
> > > http://wiki.apache.org/hadoop/HadoopIPv6
> > >
> > > Thanks,
> > > Eli
> > >
> > > On Fri, Aug 16, 2013 at 8:27 AM, Andrew Pennebaker
> > > <[EMAIL PROTECTED] <javascript:;>> wrote:
> > > > When will Hadoop get better IPv6 support? It would be nice if Ubuntu
> > > users
> > > > didn't have to disable IPv6 in order to get Hadoop working.
> > >
> >
>
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