[HADOOP-9090] Support on-demand publish of metrics

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.2.0, 2.0.3-alpha
• Component/s: metrics
• Hadoop Flags: Reviewed
• Assignee: Mostafa Elhemali
• Reporter: Mostafa Elhemali
• Created: 25/Nov/12 20:33
• Updated: 15/Feb/13 13:12
• Resolved: 03/Dec/12 14:30

Description

Updated description based on feedback:

We have a need to publish metrics out of some short-living processes, which is not really well-suited to the current metrics system implementation which periodically publishes metrics asynchronously (a behavior that works great for long-living processes). Of course I could write my own metrics system, but it seems like such a waste to rewrite all the awesome code currently in the MetricsSystemImpl and supporting classes.
The way this JIRA solves this problem is adding a new method publishMetricsNow() to the MetricsSystemImpl() class, that does a synchronous out-of-band push of the metrics from the sources to the sink. I also add a method to MetricsSinkAdapter (putMetricsImmediate) to support that change.