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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1954) Improve corrupt files warning message
Date Fri, 27 May 2011 18:56:47 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Patrick Hunt updated HDFS-1954:
-------------------------------

    Status: Patch Available  (was: Open)

Thanks for the feedback guys. I agree what you are suggesting is better than what I came up
with. However I did think about such solutions and ended up deciding not to make such changes
for this specific jira, a summary why:

1) Originally I nearly implemented what Suresh suggests, which is a great idea, but decided
against it because of the reason Todd mentioned (offline deployments), the fact that no such
faq already existed (I checked both the faq and the troubleshooting guide on the wiki), and
finally because afaict none of the existing screens are linking out to such docs. I didn't
want to introduce new functionality here, just address the jira.

2) newbie users are the most likely to make this mistake. If you're more experience with hadoop
you're also more likely to know what other issues could have caused this, or at least where
to look. So having a big long list didn't seem that important.

3) I could have introduced a new "faq" page, however I decided against that because I didn't
want to duplicate information that rightly should be in the wiki (faq).

4) I had limited time, I'm a hadoop "newbie", I wanted to address the issue at hand. Philo's
comment "perfect enemy of good".

I'd be happy if someone else were to create another jira that addresses this at a higher level
(adds a faq, external links, whatever) and as a results wipes out my change, but short of
that happening I'll re-submit this as a short term fix. If it doesn't meet your approval at
least I can say I tried. Thanks!


> Improve corrupt files warning message
> -------------------------------------
>
>                 Key: HDFS-1954
>                 URL: https://issues.apache.org/jira/browse/HDFS-1954
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: philo vivero
>            Assignee: Patrick Hunt
>         Attachments: HDFS-1954.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> On NameNode web interface, you may get this warning:
>   WARNING : There are about 32 missing blocks. Please check the log or run fsck.
> If the cluster was started less than 14 days before, it would be great to add: "Is dfs.data.dir
defined?"
> If at the point of that error message, that parameter could be checked, and error made
"OMG dfs.data.dir isn't defined!" that'd be even better. As is, troubleshooting undefined
parameters is a difficult proposition.
> I suspect this is an easy fix.

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