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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6108) Add support for EBS storage on EC2
Date Wed, 11 Nov 2009 23:34:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12776738#action_12776738

Aaron Kimball commented on HADOOP-6108:

34] you seem to pick an arbitrary AMI. How's this chosen? Is there a list of appropriate AMIS

58] "with with"

1) /bin/bash -> /usr/bin/env bash
25) Is it really necessary to source ~/.bashrc? The /bin/bash on the shebang line should take
care of this.

same two concerns as above.

34) the `sleep 5` can be pushed above the {{if}} and used only once.

TestJsonVolumeSpecManager really needs some comments; there's a number of multiply-nested
arrays being dereferenced and it's not obvious what these prove.  Is this just testing that
the "spec" record earlier in the file was parsed correctly? 

hadoop-ec2-init-remote.sh ]
96) consider putting this in /etc/profile too, so that it affects all users, not just root.
171) given EBS replication, is it ok to go to dfs rep 2 here? 

VERSION ] should this file match the version associated with the hadoop-common project at


instead of a million 'from.... import' commands, consider 'import hadoop.cloud.commands as
commands', then use commands.MASTER, commands.attach_storage(), etc.

254) {{_prompt}} consider being case-insensitive here.
291) in the event of a timeout, should you still print the master url? Is there definitely
a master? Please add a comment saying why further error handling is not needed. A message
suggesting follow-up action items for the user (e.g. "check hadoop-ec2 list to make sure it
really booted") would be helpful too.

329) ditto.

346) since we're already parsing a config file, can the proxy port be configurable? What if
the user's got two clusters running simultaneously?

461) Add a message saying how to get usage/help text out of the app?


get_cluster() 33)  unpythonic key check; this should throw KeyError if provider is not found.

Cluster stub functions ) For mandatory methods (e.g. get_provider_code), how about {{raise
Exception("Unimplemented")}} instead of {{pass}}, or maybe add UnimplementedException / NotYetImplemented
/ Something similar?


36) Maybe add a comment describing high-level purpose of ROLES, and examples of potential
future use (e.g., "HBase support might add new roles here, as would divorced JT/NN, etc.")

launch_master() 83) better error msg / comment explaining how this timeout is handled in the
rest of the method's logic?

launch_slaves() 190) ditto.

231) Since we support both Hadoop 0.18 and 0.20 in the documentation, is there additional
logic required to gracefully support both cluster versions in this code here?


JsonVolumeManager._load() ) why not just percolate the IOError? Do we want file errors to
silently initialize an empty vol manager? (Is this file something the user specifies, or an
optional file? If the former, this should fail hard. If the latter, silent continue seems

class Storage ) same comment as above re. NotYetImplemented vs. {{pass}}

util.py ]

bash_quote() ) do you need to double-escape backslashes? The unit tests also don't cover internal
backslash characters.

ec2.py ]
authorize_role() 150) Why not just catch InvalidPermission.Duplicate?

> Add support for EBS storage on EC2
> ----------------------------------
>                 Key: HADOOP-6108
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6108
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: contrib/ec2
>            Reporter: Tom White
>            Assignee: Tom White
>         Attachments: HADOOP-6108.patch, HADOOP-6108.patch
> By using EBS for namenode and datanode storage we can have persistent, restartable Hadoop
clusters running on EC2.

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