Harry Harpham created HBASE-15417:
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Summary: Calls to ObserverContext#bypass in a region observer's
prePut method are inconsistent
Key: HBASE-15417
URL: https://issues.apache.org/jira/browse/HBASE-15417
Project: HBase
Issue Type: Bug
Reporter: Harry Harpham
Priority: Minor
Calling ctx.bypass(), where ctx is the ObserverContext object passed in to the
region observer's prePut method results in some inconsistent behavior.
If every other put in the batch is also bypassed, the region observer sees none
of these in its postPut method. If there is at least one other put which is
not bypassed, the region observer sees all of the puts in the batch _including
those which were bypassed_.
The end result is that, after bypassing a put, that put may or may not end up
in the region observer's postPut method. This behavior is dependent solely on
which other puts the bypassed put is batched together with.
I tried to find existing tickets for this issue, but was unable to. Apologies
if I missed something. The closest issues I could find were HBASE-4331 and
HBASE-11503, but those didn't seem to quite hit it.
Additionally, I threw together a quick demonstration of this issue:
https://github.com/hwh33/bypass-inconsistency-demo. You can run that demo in
memory using the testing utility or against a running cluster. I actually
haven't had time to test it against a cluster though, so you may encounter bugs
if running in that mode.
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