James Clampffer created HDFS-9616:
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Summary: 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
Reporter: James Clampffer
Assignee: James Clampffer
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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