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https://issues.apache.org/jira/browse/HDFS-9616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bob Hansen updated HDFS-9616:
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Assignee: Bob Hansen (was: James Clampffer)
> libhdfs++ Add runtime hooks to allow a client application to add low level
> monitoring and tests.
> ------------------------------------------------------------------------------------------------
>
> Key: HDFS-9616
> URL: https://issues.apache.org/jira/browse/HDFS-9616
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: James Clampffer
> Assignee: Bob Hansen
> Attachments: HDFS-9616.HDFS-8707.002.patch
>
>
> It would be nice to have a set of callable objects and corresponding event
> hooks in useful places that can be set by a client application at runtime.
> This is intended to provide a scalable mechanism for implementing counters
> (#retries, #namenode requests) or application specific testing e.g. simulate
> a dropped connection when the test system running the client application
> requests.
> Current implementation plan is a struct full of callbacks (std::functions)
> owned by the FileSystemImpl. A callback could be set (or left as a no-op)
> and when the code hits the corresponding event it will be invoked with a
> reference to the object (for context) and each method argument by reference.
> The callback returns a bool: true to continue execution or false to bail out
> of the calling method.
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