[jira] [Updated] (HADOOP-9090) Support on-demand publish of metrics

["Luke Lu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-9090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Luke Lu updated HADOOP-9090:
----------------------------

    Summary: Support on-demand publish of metrics  (was: Refactor MetricsSystemImpl to allow for an on-demand publish system)

Mostafa, I'm still a little bothered by the fact that a wrapper object is created for per publish per sink in normal cases. Since MetricsBuffer is trivially decoratable, how about creating a WaitalbeMetricsBuffer for OOB case only?
                
> Support on-demand publish of metrics
> ------------------------------------
>
>                 Key: HADOOP-9090
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9090
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: metrics
>            Reporter: Mostafa Elhemali
>            Priority: Minor
>         Attachments: HADOOP-9090.2.patch, HADOOP-9090.justEnhanceDefaultImpl.2.patch, HADOOP-9090.justEnhanceDefaultImpl.3.patch, HADOOP-9090.justEnhanceDefaultImpl.4.patch, HADOOP-9090.justEnhanceDefaultImpl.5.patch, HADOOP-9090.justEnhanceDefaultImpl.6.patch, HADOOP-9090.justEnhanceDefaultImpl.patch, HADOOP-9090.patch
>
>
> 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.

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