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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2430) The number of failed or low-resource volumes the NN can tolerate should be configurable
Date Sat, 19 Nov 2011 03:34:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13153363#comment-13153363
] 

Eli Collins commented on HDFS-2430:
-----------------------------------

The api for NNResourcePolicy#areResourcesAvailable is a little strange, if a required resource
is not available we return false, but if there are not enough redundant resources we throw
a RTE. Do callers need to distinguish between these two cases? If not, we should return false
in both cases.
If so, there should be two separate apis. I'd make the method name better reflect the purpose
in the comment (whether we can log edits), the method is generic but the particular policy
is edits-specific.

Does the dir checking use canonical paths so we're sure the checks pass in case of symlinks?
 
Nits: 
* NNResourcePolicy needs param javadocs
* NNResourcePolicy, NNResourceChecker, and CheckableNNResource need @InterfaceAudience.Private
annotations

Otherwise looks great.
                
> The number of failed or low-resource volumes the NN can tolerate should be configurable
> ---------------------------------------------------------------------------------------
>
>                 Key: HDFS-2430
>                 URL: https://issues.apache.org/jira/browse/HDFS-2430
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: name-node
>    Affects Versions: 0.24.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-2430.patch, HDFS-2430.patch, HDFS-2430.patch
>
>
> Currently the number of failed or low-resource volumes the NN can tolerate is effectively
hard-coded at 1. It would be nice if this were configurable.

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