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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-226) DFSShell problems. Incorrect block replication detection in fsck.
Date Thu, 18 May 2006 02:43:06 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-226?page=comments#action_12412282 ] 

Konstantin Shvachko commented on HADOOP-226:

I like Commons CLI. I think we should use it.
Except that we have sort of just one command, which is hadoop,
with hierarchical options, arguments, and sub-options.
Yes HADOOP-59 has other related issues.
I agree we should combine all of them in one new issue specifically
dedicated to DFSShell.

> DFSShell problems. Incorrect block replication detection in fsck.
> -----------------------------------------------------------------
>          Key: HADOOP-226
>          URL: http://issues.apache.org/jira/browse/HADOOP-226
>      Project: Hadoop
>         Type: Bug

>   Components: dfs
>  Environment: All
>     Reporter: Konstantin Shvachko

> 1. We need to adjust Dfsck to the new per-file replication feature.
> fsck checks block replication based on the configured global replication parameter.
> Which is now just the default. The actual file replication is returned in DFSFileInfo.
> So at least the reporting is screwed by that, although I didn't check what will happen
> other options -move and -delete.
> 2. fsck throws NullPointerException if you type
> bin/hadoop fsck -files /doc
> instead of
> bin/hadoop fsck /doc -files
> 3. Unfortunately, there are several commands that throw different kinds of Exceptions
> rather than at least printing the usage info, when some of its arguments are missing
> misplaced. ArrayIndexOutOfBoundsException is one them. Try
> bin/hadoop dfs -mv
> bin/hadoop dfs -cp
> bin/hadoop dfs -rm
> 4. In general the shell is growing and getting more sophisticated.
> Should we work out a general convention on how the parameters should be structured, named,
> short/long version of the keywords, help, etc.

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