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Date: Wed, 13 Jun 2012 01:13:42 +0000 (UTC)
From: "Aaron T. Myers (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3518) Provide API to check HDFS
 operational state
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    [ https://issues.apache.org/jira/browse/HDFS-3518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294045#comment-13294045 ] 

Aaron T. Myers commented on HDFS-3518:
--------------------------------------

Hey Nicholas, patch looks pretty good to me. Two comments:

# Perhaps this method could reasonably be added to o.a.h.hdfs.client.HdfsAdmin?
# This won't work in an HA setup at the moment since DistributedFileSystem#setSafeMode does not perform client failover, per HDFS-3507. Presumably a user writing against the isHealthy API would like it to return success without considering how many NNs are in play. We might want to wait for resolution of that issue before we introduce this new API that we know won't work as intended.
                
> Provide API to check HDFS operational state
> -------------------------------------------
>
>                 Key: HDFS-3518
>                 URL: https://issues.apache.org/jira/browse/HDFS-3518
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>            Reporter: Bikas Saha
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h3518_20120611.patch
>
>
> This will improve the usability of JobTracker safe mode.

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