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| <div class="subTitle">org.apache.hadoop.mapreduce.lib.aggregate</div> |
| <h2 title="Class ValueAggregatorBaseDescriptor" class="title">Class ValueAggregatorBaseDescriptor</h2> |
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| <ul class="inheritance"> |
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| <li>org.apache.hadoop.mapreduce.lib.aggregate.ValueAggregatorBaseDescriptor</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapreduce.lib.aggregate">ValueAggregatorDescriptor</a></dd> |
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| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorBaseDescriptor.html" title="class in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorBaseDescriptor</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">ValueAggregatorBaseDescriptor</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapreduce.lib.aggregate">ValueAggregatorDescriptor</a></pre> |
| <div class="block">This class implements the common functionalities of |
| the subclasses of ValueAggregatorDescriptor class.</div> |
| </li> |
| </ul> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#DOUBLE_VALUE_SUM">DOUBLE_VALUE_SUM</a></span></code> </td> |
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| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#inputFile">inputFile</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#LONG_VALUE_MAX">LONG_VALUE_MAX</a></span></code> </td> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#LONG_VALUE_MIN">LONG_VALUE_MIN</a></span></code> </td> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#LONG_VALUE_SUM">LONG_VALUE_SUM</a></span></code> </td> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#STRING_VALUE_MAX">STRING_VALUE_MAX</a></span></code> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#STRING_VALUE_MIN">STRING_VALUE_MIN</a></span></code> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#UNIQ_VALUE_COUNT">UNIQ_VALUE_COUNT</a></span></code> </td> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#VALUE_HISTOGRAM">VALUE_HISTOGRAM</a></span></code> </td> |
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| <h3>Fields inherited from interface org.apache.hadoop.mapreduce.lib.aggregate.<a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapreduce.lib.aggregate">ValueAggregatorDescriptor</a></h3> |
| <code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorDescriptor.html#ONE">ONE</a>, <a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorDescriptor.html#TYPE_SEPARATOR">TYPE_SEPARATOR</a></code></li> |
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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#ValueAggregatorBaseDescriptor--">ValueAggregatorBaseDescriptor</a></span>()</code> </td> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#configure-org.apache.hadoop.conf.Configuration-">configure</a></span>(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</code> |
| <div class="block">get the input file name.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</a><<a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>,<a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateEntry-java.lang.String-java.lang.String-org.apache.hadoop.io.Text-">generateEntry</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> type, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> id, |
| <a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a> val)</code> </td> |
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| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateKeyValPairs-java.lang.Object-java.lang.Object-">generateKeyValPairs</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> key, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> val)</code> |
| <div class="block">Generate 1 or 2 aggregation-id/value pairs for the given key/value pair.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapreduce.lib.aggregate">ValueAggregator</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorBaseDescriptor.html#generateValueAggregator-java.lang.String-long-">generateValueAggregator</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> type, |
| long uniqCount)</code> </td> |
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| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> UNIQ_VALUE_COUNT</pre> |
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| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> STRING_VALUE_MAX</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.aggregate.ValueAggregatorBaseDescriptor.STRING_VALUE_MAX">Constant Field Values</a></dd> |
| </dl> |
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| <a name="STRING_VALUE_MIN"> |
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| <h4>STRING_VALUE_MIN</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> STRING_VALUE_MIN</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.aggregate.ValueAggregatorBaseDescriptor.STRING_VALUE_MIN">Constant Field Values</a></dd> |
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| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> inputFile</pre> |
| </li> |
| </ul> |
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| </ul> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.detail"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="ValueAggregatorBaseDescriptor--"> |
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| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>ValueAggregatorBaseDescriptor</h4> |
| <pre>public ValueAggregatorBaseDescriptor()</pre> |
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| <h3>Method Detail</h3> |
| <a name="generateEntry-java.lang.String-java.lang.String-org.apache.hadoop.io.Text-"> |
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| </a> |
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| <h4>generateEntry</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</a><<a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>,<a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>> generateEntry(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> type, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> id, |
| <a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a> val)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - the aggregation type</dd> |
| <dd><code>id</code> - the aggregation id</dd> |
| <dd><code>val</code> - the val associated with the id to be aggregated</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an Entry whose key is the aggregation id prefixed with |
| the aggregation type.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="generateValueAggregator-java.lang.String-long-"> |
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| <h4>generateValueAggregator</h4> |
| <pre>public static <a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregator.html" title="interface in org.apache.hadoop.mapreduce.lib.aggregate">ValueAggregator</a> generateValueAggregator(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> type, |
| long uniqCount)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - the aggregation type</dd> |
| <dd><code>uniqCount</code> - the limit in the number of unique values to keep, |
| if type is UNIQ_VALUE_COUNT</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a value aggregator of the given type.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="generateKeyValPairs-java.lang.Object-java.lang.Object-"> |
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| <h4>generateKeyValPairs</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</a><<a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>,<a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>>> generateKeyValPairs(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> key, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> val)</pre> |
| <div class="block">Generate 1 or 2 aggregation-id/value pairs for the given key/value pair. |
| The first id will be of type LONG_VALUE_SUM, with "record_count" as |
| its aggregation id. If the input is a file split, |
| the second id of the same type will be generated too, with the file name |
| as its aggregation id. This achieves the behavior of counting the total |
| number of records in the input data, and the number of records |
| in each input file.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorDescriptor.html#generateKeyValPairs-java.lang.Object-java.lang.Object-">generateKeyValPairs</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapreduce.lib.aggregate">ValueAggregatorDescriptor</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - input key</dd> |
| <dd><code>val</code> - input value</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a list of aggregation id/value pairs. An aggregation id encodes an |
| aggregation type which is used to guide the way to aggregate the |
| value in the reduce/combiner phrase of an Aggregate based job.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="configure-org.apache.hadoop.conf.Configuration-"> |
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| </a> |
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| <h4>configure</h4> |
| <pre>public void configure(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</pre> |
| <div class="block">get the input file name.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorDescriptor.html#configure-org.apache.hadoop.conf.Configuration-">configure</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/mapreduce/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapreduce.lib.aggregate">ValueAggregatorDescriptor</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - a configuration object</dd> |
| </dl> |
| </li> |
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