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| <div class="subTitle">org.apache.hadoop.mapreduce.lib.db</div> |
| <h2 title="Class DBOutputFormat" class="title">Class DBOutputFormat<K extends <a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapreduce.lib.db">DBWritable</a>,V></h2> |
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| <li> |
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| <li><a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html" title="class in org.apache.hadoop.mapreduce">org.apache.hadoop.mapreduce.OutputFormat</a><K,V></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.lib.db.DBOutputFormat<K,V></li> |
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| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../../org/apache/hadoop/mapred/lib/db/DBOutputFormat.html" title="class in org.apache.hadoop.mapred.lib.db">DBOutputFormat</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">DBOutputFormat<K extends <a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapreduce.lib.db">DBWritable</a>,V></span> |
| extends <a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html" title="class in org.apache.hadoop.mapreduce">OutputFormat</a><K,V></pre> |
| <div class="block">A OutputFormat that sends the reduce output to a SQL table. |
| <p> |
| <a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="class in org.apache.hadoop.mapreduce.lib.db"><code>DBOutputFormat</code></a> accepts <key,value> pairs, where |
| key has a type extending DBWritable. Returned <a href="../../../../../../org/apache/hadoop/mapreduce/RecordWriter.html" title="class in org.apache.hadoop.mapreduce"><code>RecordWriter</code></a> |
| writes <b>only the key</b> to the database with a batch SQL query.</div> |
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| <td class="colFirst"><code><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/db/DBOutputFormat.html#dbProductName">dbProductName</a></span></code> </td> |
| </tr> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html#DBOutputFormat--">DBOutputFormat</a></span>()</code> </td> |
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| <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/db/DBOutputFormat.html#checkOutputSpecs-org.apache.hadoop.mapreduce.JobContext-">checkOutputSpecs</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</a> context)</code> |
| <div class="block">Check for validity of the output-specification for the job.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><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/db/DBOutputFormat.html#constructQuery-java.lang.String-java.lang.String:A-">constructQuery</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> table, |
| <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>[] fieldNames)</code> |
| <div class="block">Constructs the query used as the prepared statement to insert data.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/mapreduce/OutputCommitter.html" title="class in org.apache.hadoop.mapreduce">OutputCommitter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html#getOutputCommitter-org.apache.hadoop.mapreduce.TaskAttemptContext-">getOutputCommitter</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="interface in org.apache.hadoop.mapreduce">TaskAttemptContext</a> context)</code> |
| <div class="block">Get the output committer for this output format.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/mapreduce/RecordWriter.html" title="class in org.apache.hadoop.mapreduce">RecordWriter</a><<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">K</a>,<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">V</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html#getRecordWriter-org.apache.hadoop.mapreduce.TaskAttemptContext-">getRecordWriter</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="interface in org.apache.hadoop.mapreduce">TaskAttemptContext</a> context)</code> |
| <div class="block">Get the <a href="../../../../../../org/apache/hadoop/mapreduce/RecordWriter.html" title="class in org.apache.hadoop.mapreduce"><code>RecordWriter</code></a> for the given task.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html#setOutput-org.apache.hadoop.mapreduce.Job-java.lang.String-int-">setOutput</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> job, |
| <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> tableName, |
| int fieldCount)</code> |
| <div class="block">Initializes the reduce-part of the job |
| with the appropriate output settings</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html#setOutput-org.apache.hadoop.mapreduce.Job-java.lang.String-java.lang.String...-">setOutput</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> job, |
| <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> tableName, |
| <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>... fieldNames)</code> |
| <div class="block">Initializes the reduce-part of the job with |
| the appropriate output settings</div> |
| </td> |
| </tr> |
| </table> |
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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> |
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| </ul> |
| </li> |
| </ul> |
| </div> |
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| <ul class="blockList"> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <li class="blockList"><a name="field.detail"> |
| <!-- --> |
| </a> |
| <h3>Field Detail</h3> |
| <a name="dbProductName"> |
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| </a> |
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| <h4>dbProductName</h4> |
| <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> dbProductName</pre> |
| </li> |
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| <h3>Constructor Detail</h3> |
| <a name="DBOutputFormat--"> |
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| <h4>DBOutputFormat</h4> |
| <pre>public DBOutputFormat()</pre> |
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| <h3>Method Detail</h3> |
| <a name="checkOutputSpecs-org.apache.hadoop.mapreduce.JobContext-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>checkOutputSpecs</h4> |
| <pre>public void checkOutputSpecs(<a href="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</a> context) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html#checkOutputSpecs-org.apache.hadoop.mapreduce.JobContext-">OutputFormat</a></code></span></div> |
| <div class="block">Check for validity of the output-specification for the job. |
| |
| <p>This is to validate the output specification for the job when it is |
| a job is submitted. Typically checks that it does not already exist, |
| throwing an exception when it already exists, so that output is not |
| overwritten.</p> |
| |
| Implementations which write to filesystems which support delegation |
| tokens usually collect the tokens for the destination path(s) |
| and attach them to the job context's JobConf.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html#checkOutputSpecs-org.apache.hadoop.mapreduce.JobContext-">checkOutputSpecs</a></code> in class <code><a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html" title="class in org.apache.hadoop.mapreduce">OutputFormat</a><<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">K</a> extends <a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapreduce.lib.db">DBWritable</a>,<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">V</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>context</code> - information about the job</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - when output should not be attempted</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getOutputCommitter-org.apache.hadoop.mapreduce.TaskAttemptContext-"> |
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| </a> |
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| <li class="blockList"> |
| <h4>getOutputCommitter</h4> |
| <pre>public <a href="../../../../../../org/apache/hadoop/mapreduce/OutputCommitter.html" title="class in org.apache.hadoop.mapreduce">OutputCommitter</a> getOutputCommitter(<a href="../../../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="interface in org.apache.hadoop.mapreduce">TaskAttemptContext</a> context) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html#getOutputCommitter-org.apache.hadoop.mapreduce.TaskAttemptContext-">OutputFormat</a></code></span></div> |
| <div class="block">Get the output committer for this output format. This is responsible |
| for ensuring the output is committed correctly.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html#getOutputCommitter-org.apache.hadoop.mapreduce.TaskAttemptContext-">getOutputCommitter</a></code> in class <code><a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html" title="class in org.apache.hadoop.mapreduce">OutputFormat</a><<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">K</a> extends <a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapreduce.lib.db">DBWritable</a>,<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">V</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>context</code> - the task context</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an output committer</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="constructQuery-java.lang.String-java.lang.String:A-"> |
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| </a> |
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| <h4>constructQuery</h4> |
| <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> constructQuery(<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> table, |
| <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>[] fieldNames)</pre> |
| <div class="block">Constructs the query used as the prepared statement to insert data.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>table</code> - the table to insert into</dd> |
| <dd><code>fieldNames</code> - the fields to insert into. If field names are unknown, supply an |
| array of nulls.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getRecordWriter-org.apache.hadoop.mapreduce.TaskAttemptContext-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getRecordWriter</h4> |
| <pre>public <a href="../../../../../../org/apache/hadoop/mapreduce/RecordWriter.html" title="class in org.apache.hadoop.mapreduce">RecordWriter</a><<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">K</a>,<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">V</a>> getRecordWriter(<a href="../../../../../../org/apache/hadoop/mapreduce/TaskAttemptContext.html" title="interface in org.apache.hadoop.mapreduce">TaskAttemptContext</a> context) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Get the <a href="../../../../../../org/apache/hadoop/mapreduce/RecordWriter.html" title="class in org.apache.hadoop.mapreduce"><code>RecordWriter</code></a> for the given task.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html#getRecordWriter-org.apache.hadoop.mapreduce.TaskAttemptContext-">getRecordWriter</a></code> in class <code><a href="../../../../../../org/apache/hadoop/mapreduce/OutputFormat.html" title="class in org.apache.hadoop.mapreduce">OutputFormat</a><<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">K</a> extends <a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBWritable.html" title="interface in org.apache.hadoop.mapreduce.lib.db">DBWritable</a>,<a href="../../../../../../org/apache/hadoop/mapreduce/lib/db/DBOutputFormat.html" title="type parameter in DBOutputFormat">V</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>context</code> - the information about the current task.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a <a href="../../../../../../org/apache/hadoop/mapreduce/RecordWriter.html" title="class in org.apache.hadoop.mapreduce"><code>RecordWriter</code></a> to write the output for the job.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setOutput-org.apache.hadoop.mapreduce.Job-java.lang.String-java.lang.String...-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setOutput</h4> |
| <pre>public static void setOutput(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> job, |
| <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> tableName, |
| <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>... fieldNames) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Initializes the reduce-part of the job with |
| the appropriate output settings</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>job</code> - The job</dd> |
| <dd><code>tableName</code> - The table to insert data into</dd> |
| <dd><code>fieldNames</code> - The field names in the table.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setOutput-org.apache.hadoop.mapreduce.Job-java.lang.String-int-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>setOutput</h4> |
| <pre>public static void setOutput(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> job, |
| <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> tableName, |
| int fieldCount) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Initializes the reduce-part of the job |
| with the appropriate output settings</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>job</code> - The job</dd> |
| <dd><code>tableName</code> - The table to insert data into</dd> |
| <dd><code>fieldCount</code> - the number of fields in the table.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
| </li> |
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