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https://issues.apache.org/jira/browse/HBASE-14869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15022263#comment-15022263
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Dave Latham commented on HBASE-14869:
-------------------------------------
We have 1 cluster where we keep everything in block cache and care about the
low latencies. Other scans with heavy filters can take a long time. I'd
suggest something like these roughly log_3 bands in milliseconds:
0-1
1-3
3-10
10-30
30-100
100-300
300-1000
1000-3000
3000-10000
10000-30000
30000-100000
100000-300000
300000+ (greater than 5 minutes)
> Better request latency histograms
> ---------------------------------
>
> Key: HBASE-14869
> URL: https://issues.apache.org/jira/browse/HBASE-14869
> Project: HBase
> Issue Type: Brainstorming
> Reporter: Lars Hofhansl
>
> I just discussed this with a colleague.
> The get, put, etc, histograms that each region server keeps are somewhat
> useless (depending on what you want to achieve of course), as they are
> aggregated and calculated by each region server.
> It would be better to record the number of requests in certainly latency
> bands in addition to what we do now.
> For example the number of gets that took 0-5ms, 6-10ms, 10-20ms, 20-50ms,
> 50-100ms, 100-1000ms, > 1000ms, etc. (just as an example, should be
> configurable).
> That way we can do further calculations after the fact, and answer questions
> like: How often did we miss our SLA? Percentage of requests that missed an
> SLA, etc.
> Comments?
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