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https://issues.apache.org/jira/browse/HDFS-1958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035898#comment-13035898
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Todd Lipcon commented on HDFS-1958:
-----------------------------------
well, fsck for example supports either 'y' or 'Y' for yes, and 'n' or 'N' for
no.
fsck also does the following which we can't replicate in Java:
{code}
tcgetattr (0, &termios);
tmp = termios;
tmp.c_lflag &= ~(ICANON | ECHO);
tmp.c_cc[VMIN] = 1;
tmp.c_cc[VTIME] = 0;
tcsetattr (0, TCSANOW, &tmp);
{code}
so that it can do an unbuffered read of a single keypress from stdin. Thus if
you start to type "yes" or "no" it will see the "y" or "n" and act as expected.
Since we can't do that, accepting "yes" or "no" seems like a good idea!
[to satisfy Allen's inevitable gripe, I'm referring to the Linux-specific
e2fsck behavior here]
> Format confirmation prompt should be more lenient of its input
> --------------------------------------------------------------
>
> Key: HDFS-1958
> URL: https://issues.apache.org/jira/browse/HDFS-1958
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.22.0
>
> Attachments: hdfs-1958.txt
>
>
> As reported on the mailing list, the namenode format prompt only accepts 'Y'.
> We should also accept 'y' and 'yes' (non-case-sensitive).
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