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Bob Hansen updated HDFS-9616: ----------------------------- Attachment: HDFS-9616.HDFS-8707.002.patch Added callbacks that provide context (cluster, file, and event) and a channel back to the libhdfspp code (currently can simulate errors if doing a debug compile). > 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: James Clampffer > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)