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From "Jonathan Gray" <jg...@apache.org>
Subject Review Request: HBASE-3211 Key only filter
Date Wed, 10 Nov 2010 23:19:26 GMT

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Review request for hbase, stack and Kannan Muthukkaruppan.


Adds a new filter, KeyOnlyFilter.  The idea is that this will make it so only the key portion
of all the KVs are returned.  Could imagine a few use cases where you just need the keys/index
not the values.  We have one where we have giant rows with big values and want to just get
the qualifiers/versions w/o values.

Adds a new method in KeyValue, convertToKeyOnly().  From javadoc:

   * Converts this KeyValue to only contain the key portion (the value is
   * changed to be null).  This method does a full copy of the backing byte
   * array and does not modify the original byte array of this KeyValue.
   * <p>
   * This method is used by {@link KeyOnlyFilter} and is an advanced feature of
   * KeyValue, proceed with caution.

This addresses bug HBASE-3211.


  trunk/src/main/java/org/apache/hadoop/hbase/KeyValue.java 1033617 
  trunk/src/main/java/org/apache/hadoop/hbase/filter/KeyOnlyFilter.java PRE-CREATION 
  trunk/src/main/java/org/apache/hadoop/hbase/io/HbaseObjectWritable.java 1033617 
  trunk/src/test/java/org/apache/hadoop/hbase/TestKeyValue.java 1033617 
  trunk/src/test/java/org/apache/hadoop/hbase/filter/TestFilter.java 1033617 

Diff: http://review.cloudera.org/r/1208/diff


Test of the KV method added to TestKeyValue.  Test of KeyOnlyFilter added to TestFilter. 
Both passing.



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