On Friday, August 16, 2013, Steve Loughran wrote: > On 16 August 2013 10:05, Andrew Pennebaker > <apenneba...@42six.com<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 > > <e...@cloudera.com<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 > > > <apenneba...@42six.com <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. > > > > > > > -- > CONFIDENTIALITY NOTICE > NOTICE: This message is intended for the use of the individual or entity to > which it is addressed and may contain information that is confidential, > privileged and exempt from disclosure under applicable law. If the reader > of this message is not the intended recipient, you are hereby notified that > any printing, copying, dissemination, distribution, disclosure or > forwarding of this communication is strictly prohibited. If you have > received this communication in error, please contact the sender immediately > and delete it from your system. Thank You. >
