Will Berkeley created KUDU-2316:
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Summary: 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
Affects Versions: 1.6.0
Reporter: Will Berkeley
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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