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https://issues.apache.org/jira/browse/HBASE-3836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027402#comment-13027402
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Todd Lipcon commented on HBASE-3836:
------------------------------------
Overview of the design:
Add a TaskMonitor class which serves as the central place to track ongoing
actions. It has:
-- MonitoredTask createTask("Description")
-- List<MonitoredTask> getRecentTasks()
The MonitoredTask interface has methods to update a status string and mark the
task as complete or aborted.
We can use tricky WeakReference magic to make sure that, if the MonitoredTask
is leaked by the user who called createTask, it will be automatically marked as
aborted.
The TaskMonitor will automatically purge any tasks that have been leaked, and
also purge completed/aborted tasks after some period of elapsed time.
The idea is that the TaskMonitor will be exposed through the web consoles, so
users can easily understand what's going on.
> Add facility to track currently progressing actions/workflows
> -------------------------------------------------------------
>
> Key: HBASE-3836
> URL: https://issues.apache.org/jira/browse/HBASE-3836
> Project: HBase
> Issue Type: New Feature
> Components: master, regionserver
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.92.0
>
>
> A lot of troubleshooting involves answering the question "well, what is your
> server doing right now?" Today, that involves some combination of
> interpreting jstack output and/or trudging through logs. Problems with these
> methods are: (a) users may not have direct ssh access to regionserver
> machines in production environments, (b) logs are very verbose, so hard to
> separate what's still going on vs stuff that might have completed, and (c)
> interpreting jstack requires a pretty good knowledge of the codebase plus
> diving into source code.
> I'd like to add a singleton (for now) which takes care of tracking any major
> actions going on in the region server and master.
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