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https://issues.apache.org/jira/browse/YARN-3628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhihai xu updated YARN-3628:
----------------------------
    Description: 
ContainerMetrics should support always-flush mode.
It will be good to set ContainerMetrics as always-flush mode if 
yarn.nodemanager.container-metrics.period-ms is configured as 0.
Currently both 0 and -1 mean flush on completion.
Also the current default value for yarn.nodemanager.container-metrics.period-ms 
is -1 and the default value  for yarn.nodemanager.container-metrics.enable is 
true. So the empty content is shown for the active container metrics until it 
is finished.
The default value for yarn.nodemanager.container-metrics.period-ms should not 
be -1.
flushOnPeriod is always false if flushPeriodMs is -1,
the content will only be shown when the container is finished.
{code}
    if (finished || flushOnPeriod) {
      registry.snapshot(collector.addRecord(registry.info()), all);
    }
{code}


  was:
The default value for yarn.nodemanager.container-metrics.period-ms should not 
be -1.
The current default value for yarn.nodemanager.container-metrics.period-ms is 
-1 and the default value  for yarn.nodemanager.container-metrics.enable is 
true. So the empty content is shown for the active container metrics until it 
is finished.
flushOnPeriod is always false if flushPeriodMs is -1,
the content will only be shown when the container is finished.
{code}
    if (finished || flushOnPeriod) {
      registry.snapshot(collector.addRecord(registry.info()), all);
    }
{code}


       Priority: Major  (was: Minor)
        Summary: ContainerMetrics should support always-flush mode.  (was: The 
default value for yarn.nodemanager.container-metrics.period-ms should not be 
-1.)

> ContainerMetrics should support always-flush mode.
> --------------------------------------------------
>
>                 Key: YARN-3628
>                 URL: https://issues.apache.org/jira/browse/YARN-3628
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>
> ContainerMetrics should support always-flush mode.
> It will be good to set ContainerMetrics as always-flush mode if 
> yarn.nodemanager.container-metrics.period-ms is configured as 0.
> Currently both 0 and -1 mean flush on completion.
> Also the current default value for 
> yarn.nodemanager.container-metrics.period-ms is -1 and the default value  for 
> yarn.nodemanager.container-metrics.enable is true. So the empty content is 
> shown for the active container metrics until it is finished.
> The default value for yarn.nodemanager.container-metrics.period-ms should not 
> be -1.
> flushOnPeriod is always false if flushPeriodMs is -1,
> the content will only be shown when the container is finished.
> {code}
>     if (finished || flushOnPeriod) {
>       registry.snapshot(collector.addRecord(registry.info()), all);
>     }
> {code}



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