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From "Andrew Purtell" <apurt...@apache.org>
Subject Review Request: Allow Observers to completely override base function
Date Wed, 15 Dec 2010 02:16:22 GMT

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Review request for hbase, Jonathan Gray and Mingjie Lai.


Currently an observer can act as a filter or translator but cannot stop a subsequent call
down to the base method for get, put, delete, etc. This patch allows observers to 1) keep
any subsequently chained observer from executing, or 2) prevent default behavior from executing.
This latter option allows a preXXX hook to completely reimplement something.

I also found and fixed some logic bugs in coprocessor framework integration in HRegion.

I will squelch the added extraneous whitespace upon commit.

This addresses bug HBASE-3348.


  src/main/java/org/apache/hadoop/hbase/coprocessor/BaseRegionObserverCoprocessor.java 134ed2f

  src/main/java/org/apache/hadoop/hbase/coprocessor/CoprocessorEnvironment.java 654b179 
  src/main/java/org/apache/hadoop/hbase/coprocessor/RegionObserver.java 10dfff4 
  src/main/java/org/apache/hadoop/hbase/regionserver/CoprocessorHost.java c57ca0c 
  src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java cf9cad0 
  src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java 8248f5f 
  src/test/java/org/apache/hadoop/hbase/coprocessor/SimpleRegionObserver.java 345790f 
  src/test/java/org/apache/hadoop/hbase/coprocessor/TestRegionObserverStacking.java 9ef3562

Diff: http://review.cloudera.org/r/1295/diff


All coprocessor unit tests pass. No failures of other unit tests observed that might be related
to these changes.



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