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From "Aaron T. Myers (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3027) HA: Implement a simple NN health check
Date Tue, 28 Feb 2012 23:14:55 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HDFS-3027:
---------------------------------

    Attachment: HDFS-3027-HDFS-1623.patch

Here's a patch which addresses the issue. Over on HDFS-2920 (where this patch was originally
posted) Eli had the following feedback:

bq. !nameNodeHasResourcesAvailable implies "The NameNode has run out of resources" instead
of the "NameNode is low on resources". It would be even better if the message was more specific
(eg mentioned lack of inodes of disk space)

Yea, agree, but to do that would be a more invasive change, and more fundamental to to the
way the NN currently checks resources, to return a status and a reason. Might if I punt that
to another JIRA?
                
> HA: Implement a simple NN health check
> --------------------------------------
>
>                 Key: HDFS-3027
>                 URL: https://issues.apache.org/jira/browse/HDFS-3027
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-3027-HDFS-1623.patch
>
>
> This JIRA is to address a TODO in NameNode about actually implementing the checkHealth
RPC.

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