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| <h2 title="Class TableReducer" class="title">Class TableReducer<KEYIN,VALUEIN,KEYOUT></h2> |
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| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>KEYIN</code> - The type of the input key.</dd> |
| <dd><code>VALUEIN</code> - The type of the input value.</dd> |
| <dd><code>KEYOUT</code> - The type of the output key.</dd> |
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| <dd><a href="../../../../../org/apache/hadoop/hbase/mapreduce/IdentityTableReducer.html" title="class in org.apache.hadoop.hbase.mapreduce">IdentityTableReducer</a></dd> |
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| <pre>@InterfaceAudience.Public |
| public abstract class <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/TableReducer.html#line.43">TableReducer</a><KEYIN,VALUEIN,KEYOUT> |
| extends org.apache.hadoop.mapreduce.Reducer<KEYIN,VALUEIN,KEYOUT,<a href="../../../../../org/apache/hadoop/hbase/client/Mutation.html" title="class in org.apache.hadoop.hbase.client">Mutation</a>></pre> |
| <div class="block">Extends the basic <code>Reducer</code> class to add the required key and |
| value input/output classes. While the input key and value as well as the |
| output key can be anything handed in from the previous map phase the output |
| value <u>must</u> be either a <a href="../../../../../org/apache/hadoop/hbase/client/Put.html" title="class in org.apache.hadoop.hbase.client"><code>Put</code></a> |
| or a <a href="../../../../../org/apache/hadoop/hbase/client/Delete.html" title="class in org.apache.hadoop.hbase.client"><code>Delete</code></a> instance when |
| using the <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableOutputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce"><code>TableOutputFormat</code></a> class. |
| <p> |
| This class is extended by <a href="../../../../../org/apache/hadoop/hbase/mapreduce/IdentityTableReducer.html" title="class in org.apache.hadoop.hbase.mapreduce"><code>IdentityTableReducer</code></a> but can also be |
| subclassed to implement similar features or any custom code needed. It has |
| the advantage to enforce the output value to a specific basic type.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>Reducer</code></dd> |
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| <code>org.apache.hadoop.mapreduce.Reducer.Context</code></li> |
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| <h4>TableReducer</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/TableReducer.html#line.43">TableReducer</a>()</pre> |
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