hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Bob Hansen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9616) libhdfs++ Add runtime hooks to allow a client application to add low level monitoring and tests.
Date Mon, 21 Mar 2016 16:05:25 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

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)

Mime
View raw message