Make HBASE-4608 easier to use
-----------------------------
Key: HBASE-5716
URL: https://issues.apache.org/jira/browse/HBASE-5716
Project: HBase
Issue Type: Improvement
Reporter: Jean-Daniel Cryans
Fix For: 0.96.0, 0.94.1
HBASE-4608 is a nice feature but after playing with it for a while I think the
following should be fixed to make it easier to use by someone who's not a dev:
- Add some signal that says that the feature is turned on. Right now you can
{{jstack | grep KeyValueCompression}} a couple of times and if you get a hit
you definitely know it's on, but otherwise the random user wouldn't know
without going through the jira.
- Add documentation in the reference guide. At the minimum add
{{hbase.regionserver.wal.enablecompression}} in there with a small description.
Better would be to add a section in {{Appendix B}} or something like that and
describe the functionality a bit and who it's useful for. For example, flush
from your brain the knowledge of the patch and read the name of the
configuration... now let's say you have a use case that involves writing easily
compressible values. Any normal user would believe that this is a good tuning
parameter for them, but it's just going to waste CPU cycles.
- Add some metrics like we have for HFiles where you get a clue about the
compression ratio.
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