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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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Re: What's the status of IPv6 support?
Steve Loughran 2013-08-16, 17:16
On 16 August 2013 10:05, Andrew Pennebaker <[EMAIL PROTECTED]> 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

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
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> On Fri, Aug 16, 2013 at 12:44 PM, Eli Collins <[EMAIL PROTECTED]> 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]> 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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Eli Collins 2013-08-16, 18:22