Dear Wiki user, You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.
The "AmazonEC2" page has been changed by Smith Scott: http://wiki.apache.org/hadoop/AmazonEC2?action=diff&rev1=80&rev2=81 * The default value for `S3_BUCKET` (`hadoop-ec2-images`) is for public images. Images for Hadoop version 0.17.1 and later are in the `hadoop-images` bucket, so you should change this variable if you want to use one of these images. You also need to change this if you want to use a private image you have built yourself. * ('''Pre 0.17''') Hadoop cluster variables (`GROUP`, `MASTER_HOST`, `NO_INSTANCES`) * `GROUP` specifies the private group to run the cluster in. Typically the default value is fine. - * `MASTER_HOST` is the hostname of the master node in the cluster. You need to set this to be a hostname that you have DNS control over - it needs resetting every time a cluster is launched. Services such as [[http://www.dyndns.com/services/dns/dyndns/|DynDNS]] and [[http://developer.amazonwebservices.com/connect/thread.jspa?messageID=61609#61609|the like]] make this fairly easy. + * `MASTER_HOST` is the hostname of the master node in the cluster. You need to set this to be a hostname that you have DNS control over - it needs resetting every time a cluster is launched. Services such as [[http://www.dyndns.com/services/dns/dyndns/|DynDNS]] and [[http://developer.amazonwebservices.com/connect/thread.jspa?messageID=61609#61609|the like]] [[http://www.contractjobs.com|Contract Jobs]] make this fairly easy. * `NO_INSTANCES` sets the number of instances in your cluster. You need to set this. Currently Amazon limits the number of concurrent instances to 20. == Running a job on a cluster (Pre 0.17) ==
