Anoop Sam John created HBASE-18898:
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Summary: Provide way for the core flow to know whether CP
implemented each of the hooks
Key: HBASE-18898
URL: https://issues.apache.org/jira/browse/HBASE-18898
Project: HBase
Issue Type: Improvement
Reporter: Anoop Sam John
This came as a discussion topic at the tale of HBASE-17732
Can we have a way in the code (before trying to call the hook) to know whether
the user has implemented one particular hook or not? eg: On write related hooks
only prePut() might be what the user CP implemented. All others are just dummy
impl from the interface. Can we have a way for the core code to know this and
avoid the call to other dummy hooks fully? Some times we do some processing for
just calling CP hooks (Say we have to make a POJO out of PB object for calling)
and if the user CP not impl this hook, we can avoid this extra work fully. The
pain of this will be more when we have to later deprecate one hook and add new.
So the dummy impl in new hook has to call the old one and that might be doing
some extra work normally.
If the CP f/w itself is having a way to tell this, the core code can make use.
What am expecting is some thing like in PB way where we can call
CPObject.hasPreXXXX(), then CPObject. preXXXX ().. Should not like asking users
to impl this extra ugly thing. When the CP instance is loaded in the RS/HM,
that object will be having this info also.
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