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https://issues.apache.org/jira/browse/HADOOP-10120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13828652#comment-13828652
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Steve Loughran commented on HADOOP-10120:
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Some general moving average classes would be convenient for a lot of things.
For stats collection on openstack HTTP operations I added one to calculate the
ongoing mean & variance:
https://github.com/apache/hadoop-common/blob/trunk/hadoop-tools/hadoop-openstack/src/main/java/org/apache/hadoop/fs/swift/util/DurationStats.java
For Hoya I'm doing something more complicated where I want some kind of
half-life on failure rates, to assess the reliability of nodes in the cluster
-for long-lived clusters cumulative counts are the wrong approach. All
long-lived YARN services are going to need this
> Additional sliding window metrics
> ---------------------------------
>
> Key: HADOOP-10120
> URL: https://issues.apache.org/jira/browse/HADOOP-10120
> Project: Hadoop Common
> Issue Type: New Feature
> Components: metrics
> Affects Versions: 2.2.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
>
> For HDFS-5350 we'd like to report the last few fsimage transfer times as a
> health metric. This would mean (for example) a sliding window of the last 10
> transfer times, when it was last updated, the total count. It'd be nice to
> have a metrics class that did this.
> It'd also be interesting to have some kind of time-based sliding window for
> statistics like counts and averages. This would let us answer questions like
> "how many RPCs happened in the last 10s? minute? 5 minutes? 10 minutes?".
> Commutative metrics like counts and averages are easy to aggregate in this
> fashion.
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