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https://issues.apache.org/jira/browse/KUDU-2316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated KUDU-2316:
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Component/s: supportability
metrics
> Expose more information about a tablet's rowsets
> ------------------------------------------------
>
> Key: KUDU-2316
> URL: https://issues.apache.org/jira/browse/KUDU-2316
> Project: Kudu
> Issue Type: Improvement
> Components: metrics, supportability
> Affects Versions: 1.6.0
> Reporter: Will Berkeley
> Priority: Major
> Attachments: rowsetblackbarofdeath.png
>
>
> Right now it's kind of hard to get an idea what a tablet's DRSs look like. We
> expose some information in a few ways:
> * the /tablet-rowsetlayout-svg page in the web ui
> * kudu local_replica dump meta
> * kudu fs list
> but, for example, if I wanted to find out how many DRS a tablet has, I'd have
> to pipe the output from one of the tools through a grep and wc -l or
> something. If I wanted to find out the average size of a rowset I could take
> that number and divide it into the tablet's size on disk to get an upper
> bound. If I wanted a measurement of how uncompacted a tablet's rowsets are I
> can look at the picture on the web ui.
> We should have some better metrics:
> # Count of DRS for a tablet
> # An average DRS size (better, a histogram)
> # Some number measuring how much rowsets overlap in primary key space
> These should be exposed as metrics and on the webui. When possible, they
> should also be exposed by tools- 1 ought to be available, whereas 2 and 3
> might not be worth computing as part of a tool.
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