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| <div class="subTitle">org.apache.hadoop.mapreduce.lib.fieldsel</div> |
| <h2 title="Class FieldSelectionHelper" class="title">Class FieldSelectionHelper</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.lib.fieldsel.FieldSelectionHelper</li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
| <ul class="blockList"> |
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| <br> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">FieldSelectionHelper</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></pre> |
| <div class="block">This class implements a mapper/reducer class that can be used to perform |
| field selections in a manner similar to unix cut. The input data is treated |
| as fields separated by a user specified separator (the default value is |
| "\t"). The user can specify a list of fields that form the map output keys, |
| and a list of fields that form the map output values. If the inputformat is |
| TextInputFormat, the mapper will ignore the key to the map function. and the |
| fields are from the value only. Otherwise, the fields are the union of those |
| from the key and those from the value. |
| |
| The field separator is under attribute "mapreduce.fieldsel.data.field.separator" |
| |
| The map output field list spec is under attribute |
| "mapreduce.fieldsel.map.output.key.value.fields.spec". |
| The value is expected to be like "keyFieldsSpec:valueFieldsSpec" |
| key/valueFieldsSpec are comma (,) separated field spec: fieldSpec,fieldSpec,fieldSpec ... |
| Each field spec can be a simple number (e.g. 5) specifying a specific field, or a range |
| (like 2-5) to specify a range of fields, or an open range (like 3-) specifying all |
| the fields starting from field 3. The open range field spec applies value fields only. |
| They have no effect on the key fields. |
| |
| Here is an example: "4,3,0,1:6,5,1-3,7-". It specifies to use fields 4,3,0 and 1 for keys, |
| and use fields 6,5,1,2,3,7 and above for values. |
| |
| The reduce output field list spec is under attribute |
| "mapreduce.fieldsel.reduce.output.key.value.fields.spec". |
| |
| The reducer extracts output key/value pairs in a similar manner, except that |
| the key is never ignored.</div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- =========== FIELD SUMMARY =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field.summary"> |
| <!-- --> |
| </a> |
| <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/fieldsel/FieldSelectionHelper.html#DATA_FIELD_SEPARATOR">DATA_FIELD_SEPARATOR</a></span></code> </td> |
| </tr> |
| <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/fieldsel/FieldSelectionHelper.html#DATA_FIELD_SEPERATOR">DATA_FIELD_SEPERATOR</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="block"><span class="deprecationComment">Use <a href="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionHelper.html#DATA_FIELD_SEPARATOR"><code>DATA_FIELD_SEPARATOR</code></a></span></div> |
| </div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <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/fieldsel/FieldSelectionHelper.html#emptyText">emptyText</a></span></code> </td> |
| </tr> |
| <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/fieldsel/FieldSelectionHelper.html#MAP_OUTPUT_KEY_VALUE_SPEC">MAP_OUTPUT_KEY_VALUE_SPEC</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/fieldsel/FieldSelectionHelper.html#REDUCE_OUTPUT_KEY_VALUE_SPEC">REDUCE_OUTPUT_KEY_VALUE_SPEC</a></span></code> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
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| </a> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionHelper.html#FieldSelectionHelper--">FieldSelectionHelper</a></span>()</code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionHelper.html#FieldSelectionHelper-org.apache.hadoop.io.Text-org.apache.hadoop.io.Text-">FieldSelectionHelper</a></span>(<a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a> key, |
| <a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a> val)</code> </td> |
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| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <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/fieldsel/FieldSelectionHelper.html#extractOutputKeyValue-java.lang.String-java.lang.String-java.lang.String-java.util.List-java.util.List-int-boolean-boolean-">extractOutputKeyValue</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> key, |
| <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> val, |
| <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> fieldSep, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> keyFieldList, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> valFieldList, |
| int allValueFieldsFrom, |
| boolean ignoreKey, |
| boolean isMap)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><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/fieldsel/FieldSelectionHelper.html#getKey--">getKey</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><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/fieldsel/FieldSelectionHelper.html#getValue--">getValue</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionHelper.html#parseOutputKeyValueSpec-java.lang.String-java.util.List-java.util.List-">parseOutputKeyValueSpec</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> keyValueSpec, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> keyFieldList, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> valueFieldList)</code> </td> |
| </tr> |
| <tr id="i4" 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/fieldsel/FieldSelectionHelper.html#specToString-java.lang.String-java.lang.String-int-java.util.List-java.util.List-">specToString</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> fieldSeparator, |
| <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> keyValueSpec, |
| int allValueFieldsFrom, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> keyFieldList, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> valueFieldList)</code> </td> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field.detail"> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="emptyText"> |
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| </a> |
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| <li class="blockList"> |
| <h4>emptyText</h4> |
| <pre>public static <a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a> emptyText</pre> |
| </li> |
| </ul> |
| <a name="DATA_FIELD_SEPARATOR"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>DATA_FIELD_SEPARATOR</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> DATA_FIELD_SEPARATOR</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.fieldsel.FieldSelectionHelper.DATA_FIELD_SEPARATOR">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="DATA_FIELD_SEPERATOR"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>DATA_FIELD_SEPERATOR</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a> |
| 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> DATA_FIELD_SEPERATOR</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> <span class="deprecationComment">Use <a href="../../../../../../org/apache/hadoop/mapreduce/lib/fieldsel/FieldSelectionHelper.html#DATA_FIELD_SEPARATOR"><code>DATA_FIELD_SEPARATOR</code></a></span></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.fieldsel.FieldSelectionHelper.DATA_FIELD_SEPERATOR">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="MAP_OUTPUT_KEY_VALUE_SPEC"> |
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| </a> |
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| <h4>MAP_OUTPUT_KEY_VALUE_SPEC</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> MAP_OUTPUT_KEY_VALUE_SPEC</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.fieldsel.FieldSelectionHelper.MAP_OUTPUT_KEY_VALUE_SPEC">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
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| <h4>REDUCE_OUTPUT_KEY_VALUE_SPEC</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> REDUCE_OUTPUT_KEY_VALUE_SPEC</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.fieldsel.FieldSelectionHelper.REDUCE_OUTPUT_KEY_VALUE_SPEC">Constant Field Values</a></dd> |
| </dl> |
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| <h3>Constructor Detail</h3> |
| <a name="FieldSelectionHelper--"> |
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| <h4>FieldSelectionHelper</h4> |
| <pre>public FieldSelectionHelper()</pre> |
| </li> |
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| <h4>FieldSelectionHelper</h4> |
| <pre>public FieldSelectionHelper(<a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a> key, |
| <a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a> val)</pre> |
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| <h4>parseOutputKeyValueSpec</h4> |
| <pre>public static int parseOutputKeyValueSpec(<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> keyValueSpec, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> keyFieldList, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> valueFieldList)</pre> |
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| <h4>specToString</h4> |
| <pre>public 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> specToString(<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> fieldSeparator, |
| <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> keyValueSpec, |
| int allValueFieldsFrom, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> keyFieldList, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> valueFieldList)</pre> |
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| <h4>getKey</h4> |
| <pre>public <a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a> getKey()</pre> |
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| <h4>getValue</h4> |
| <pre>public <a href="../../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a> getValue()</pre> |
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| <h4>extractOutputKeyValue</h4> |
| <pre>public void extractOutputKeyValue(<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> key, |
| <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> val, |
| <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> fieldSep, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> keyFieldList, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> valFieldList, |
| int allValueFieldsFrom, |
| boolean ignoreKey, |
| boolean isMap)</pre> |
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