[HADOOP-10120] Additional sliding window metrics

• Type: New Feature
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.2.0
• Component/s: metrics
• Assignee: Andrew Wang
• Reporter: Andrew Wang
• Created: 20/Nov/13 21:57
• Updated: 21/Nov/13 19:14

Description

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.

Issue Links

• is required by: HDFS-5350 Name Node should report fsimage transfer time as a metric