StoreFile query usage report
----------------------------
Key: HBASE-4147
URL: https://issues.apache.org/jira/browse/HBASE-4147
Project: HBase
Issue Type: Improvement
Reporter: Doug Meil
Priority: Minor
Detailed information on what HBase is doing in terms of reads is hard to come
by.
What would be useful is to have a periodic StoreFile query report.
Specifically, this could run on a configured interval (e.g., every 30 seconds,
60 seconds) and dump the output to the log files.
This would have all StoreFiles accessed during the reporting period (and with
the Path we would also know region, CF, and table), # of times the StoreFile
was accessed, the size of the StoreFile, and the total time (ms) spent
processing that StoreFile.
Even this level of summary would be useful to detect a which tables & CFs are
being accessed the most, and including the StoreFile would provide insight into
relative "uncompaction" (i.e., lots of StoreFiles).
I think the log-output, as opposed to UI, is an important facet with this. I'm
assuming that users will slice and dice this data on their own so I think we
should skip any kind of admin view for now (i.e., new JSPs, new APIs to expose
this data). Just getting this to log-file would be a big improvement.
Will this have a non-zero performance impact? Yes. Hopefully small, but yes
it will. However, flying a plane without any instrumentation isn't fun. :-)
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