GitHub user zentol opened a pull request:
https://github.com/apache/flink/pull/2443
[FLINK-3950] Implement MeterView
In the JIRA discussion about FLINK-3950 @StephanEwen introduced the notion
of a `MetricView`, a `Meter`that derives it's values from another Counter or
Gauge. The `View` would not be updated when the backing metric is modified, but
instead by a background thread shared by all `Views`.
This PR implements a `Meter` that derives it's values from a `Counter`,
called `MeterView`.
The `View` class is a small interface, only containing an `update()` method.
A `TimerTask` running in the `MetricRegistry` calls this `update()` method
on all `Views`, with a hard-coded update interval of 5 seconds.
The `MeterView` class implements both `View` and `Meter`. It maintains a
history of N measurements in a `long[N]` which is updated whenever
`View#update()` is called. The rate is only calculated on demand.
The PR contains a small example, demonstrating how a `MeterView` would be
created & registered in the `AbstractStreamOperator`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zentol/flink metrics_view
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2443.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2443
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commit 9b9d85600912179e7fe7c96f6e2dac77bcf09563
Author: zentol <[email protected]>
Date: 2016-08-31T13:47:17Z
[FLINK-3950] Implement MeterView
commit 929a87a3dac22258517761fef84c73bfd85a7952
Author: zentol <[email protected]>
Date: 2016-08-31T13:47:48Z
example
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