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Steve Loughran commented on HADOOP-6056: ---------------------------------------- I see that the Facebook scrips have this option set in hadoop-env.sh, and point to a sun bug which causes sockets to hang when being opened on some linux systems as the reason for the setting. # work-around for http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6483406 export HADOOP_OPTS="$HADOOP_OPTS -Djava.net.preferIPv4Stack=true" Given that FB are running large hadoop clusters, we know the java.net option does work at scale, the only issue is is everyone happy with this patch going in to 0.22? > Use java.net.preferIPv4Stack to force IPv4 > ------------------------------------------ > > Key: HADOOP-6056 > URL: https://issues.apache.org/jira/browse/HADOOP-6056 > Project: Hadoop Common > Issue Type: Improvement > Components: scripts > Affects Versions: 0.21.0, 0.22.0 > Reporter: Steve Loughran > Assignee: Michele Catasta > Fix For: 0.22.0 > > Attachments: HADOOP-6056.patch, hadoop-6056.txt > > > This was mentioned on HADOOP-3427, there is a property, > java.net.preferIPv4Stack, which you set to true for the java net process to > switch to IPv4 everywhere. > As Hadoop doesn't work on IPv6, this should be set to true in the startup > scripts. Hopefully this will ensure that Jetty will also pick it up. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.