Github user kmaehashi commented on the pull request:
https://github.com/apache/spark/pull/7647#issuecomment-164987439
Even if you use the option `--ebs-root-vol-size` proposed in this PR, you
still need to expand partition size (using `parted`) and file system size
(using `resize2fs`) by yourself, as documented in AWS user guide. Of course
you can automate these procedures via `--user-data`.
http://docs.aws.amazon.com/en_us/AWSEC2/latest/UserGuide/storage_expand_partition.html
http://docs.aws.amazon.com/en_us/AWSEC2/latest/UserGuide/ebs-expand-volume.html#recognize-expanded-volume-linux
As `--ebs-root-vol-size` option is useful in my use case, it was a bit
confusing for general users who expect that root volume size to be increased
automatically. So I'm going to remove `--ebs-root-vol-size` option in this PR.
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