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https://issues.apache.org/jira/browse/HDFS-3518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE updated HDFS-3518:
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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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