Github user mateiz commented on a diff in the pull request: https://github.com/apache/spark/pull/2081#discussion_r16936997 --- Diff: ec2/spark_ec2.py --- @@ -342,6 +343,15 @@ def launch_cluster(conn, opts, cluster_name): device.delete_on_termination = True block_map["/dev/sdv"] = device + # AWS ignores the AMI-specified block device mapping for M3. + if opts.instance_type.startswith('m3.'): + for i in range(get_num_disks(opts.instance_type)): + dev = BlockDeviceType() + dev.ephemeral_name = 'ephemeral{}'.format(i) --- End diff -- This format syntax won't work in Python 2.6 unfortunately; use `"emphemeral%d" % i`
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