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HBASE-20454 [DOC] Add note on perf to upgrade section 

Signed-off-by: Mike Drob <mdrob@apache.org>
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Michael Stack 2018-04-19 13:14:12 -07:00
parent 556b223744
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src/main/asciidoc/_chapters/upgrading.adoc
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@ -576,6 +576,17 @@ The internal changes to HBase during this upgrade were sufficient for compilatio
If you previously relied on client side tracing integrated with HBase operations, it is recommended that you upgrade your usage to HTrace 4 as well.
[[upgrade2.0.perf]]
.Performance
You will likely see a change in the performance profile on upgrade to hbase-2.0.0 given
read and write paths have undergone significant change. On release, writes may be
slower with reads about the same or much better, dependent on context. Be prepared
to spend time re-tuning (See <<performance>>).
Performance is also an area that is now under active review so look forward to
improvement in coming releases (See
link:https://issues.apache.org/jira/browse/HBASE-20188[HBASE-20188 TESTING Performance]).
////
This would be a good place to link to an appendix on migrating applications
////