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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3518) Provide API to check HDFS operational state
Date Tue, 12 Jun 2012 06:32:43 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tsz Wo (Nicholas), SZE updated HDFS-3518:

    Attachment: h3518_20120611.patch

I still think that isHealthy and isInSafeMode are different:
- SafeMode is one of the conditions to determine healthy.
- isInSafeMode may throw exception but isHealthy won't.  When there is an exception, isHealthy
simply returns false.
- If retry is set in conf or in a cached DistributedFileSystem, isInSafeMode may retry for
a long time.  isHealthy disable cache and retry.

isHealthy is a high level utility method that makes use of isInSafeMode, which is a low level
method, so that isHealthy could hide the details of handling cache, retry and exceptions.

h3518_20120611.patch: adds HdfsUtils.isHealthy(URI).
> 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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