If what Matt says is true, shouldn't this be incorporated into the next release of the Ubuntu HVM images? I think people only notice this if they are running applications that get upset when there is a long pause like HBase/Zookeeper. In our case it notices that there is a long pause and considers it a timeout and shuts itself down. But we've also seen spontaneous reboots on some of these.
We've had one other weird issue that I can not be sure is related or not, where even when we do Unix "sync" and then do EBS snapshots and the snapshot is missing large amounts of the data from the server. All the files and directories are there but many files are empty. We've seen this for the HDFS data blocks on the xfs filesystem and ami-f1589598. The only way we could get a clean EBS snapshot was by detaching the EBS volume. I would think this would impact at least anyone who is running HBase and it would impact the performance of anyone using the Ubunutu images on Cluster instances. And for some cases, it could lead to data corruption if it caused an HDFS namenode to crash or even just shutdown. In the mean time we are working on trying out Matt's suggestion on one of our machines. Its non-trivial to do on a running cluster. Thanks -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/704022 Title: xen_emul_unplug=unnecessary on kernel cmdline is required in ec2 hvm To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/704022/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
