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From e..@apache.org
Subject svn commit: r1423966 - /accumulo/trunk/core/src/main/java/org/apache/accumulo/core/iterators/Combiner.java
Date Wed, 19 Dec 2012 17:21:39 GMT
Author: ecn
Date: Wed Dec 19 17:21:39 2012
New Revision: 1423966

URL: http://svn.apache.org/viewvc?rev=1423966&view=rev
Log:
ACCUMULO-906 clarify the fact that a Combiner only works over different versions

Modified:
    accumulo/trunk/core/src/main/java/org/apache/accumulo/core/iterators/Combiner.java

Modified: accumulo/trunk/core/src/main/java/org/apache/accumulo/core/iterators/Combiner.java
URL: http://svn.apache.org/viewvc/accumulo/trunk/core/src/main/java/org/apache/accumulo/core/iterators/Combiner.java?rev=1423966&r1=1423965&r2=1423966&view=diff
==============================================================================
--- accumulo/trunk/core/src/main/java/org/apache/accumulo/core/iterators/Combiner.java (original)
+++ accumulo/trunk/core/src/main/java/org/apache/accumulo/core/iterators/Combiner.java Wed
Dec 19 17:21:39 2012
@@ -35,12 +35,13 @@ import org.apache.accumulo.core.iterator
 import org.apache.log4j.Logger;
 
 /**
- * A SortedKeyValueIterator that combines the Values for different versions of a Key into
a single Value. Combiner will replace one or more versions of a Key
+ * A SortedKeyValueIterator that combines the Values for different versions (timestamps)
of a Key into a single Value. Combiner will replace one or more versions of a Key
  * and their Values with the most recent Key and a Value which is the result of the reduce
method.
  * 
  * Subclasses must implement a reduce method: {@code public Value reduce(Key key, Iterator<Value>
iter)}.
  * 
  * This reduce method will be passed the most recent Key and an iterator over the Values
for all non-deleted versions of that Key.
+ * A combiner will not combine keys that differ by more than the timestamp.
  */
 public abstract class Combiner extends WrappingIterator implements OptionDescriber {
   static final Logger log = Logger.getLogger(Combiner.class);



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