public/documentation/javadoc/apidocs/org/apache/nutch/segment/SegmentMerger.html - nutch-site - Git at Google

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 <div class="subTitle">org.apache.nutch.segment</div>
 <h2 title="Class SegmentMerger" class="title">Class SegmentMerger</h2>
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 <li><a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configured.html?is-external=true" title="class or interface in org.apache.hadoop.conf">org.apache.hadoop.conf.Configured</a></li>
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 <li>org.apache.nutch.segment.SegmentMerger</li>
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 <pre>public class <span class="typeNameLabel">SegmentMerger</span>
 extends <a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configured.html?is-external=true" title="class or interface in org.apache.hadoop.conf">Configured</a>
 implements <a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/util/Tool.html?is-external=true" title="class or interface in org.apache.hadoop.util">Tool</a></pre>
 <div class="block">This tool takes several segments and merges their data together. Only the
  latest versions of data is retained.
  Optionally, you can apply current URLFilters to remove prohibited URL-s.
  <p>
  Also, it's possible to slice the resulting segment into chunks of fixed size.
  </p>
  <h3>Important Notes</h3> <h4>Which parts are merged?</h4>
  <p>
  It doesn't make sense to merge data from segments, which are at different
  stages of processing (e.g. one unfetched segment, one fetched but not parsed,
  and one fetched and parsed). Therefore, prior to merging, the tool will
  determine the lowest common set of input data, and only this data will be
  merged. This may have some unintended consequences: e.g. if majority of input
  segments are fetched and parsed, but one of them is unfetched, the tool will
  fall back to just merging fetchlists, and it will skip all other data from
  all segments.
  </p>
  <h4>Merging fetchlists</h4>
  <p>
  Merging segments, which contain just fetchlists (i.e. prior to fetching) is
  not recommended, because this tool (unlike the
  <a href="../../../../org/apache/nutch/crawl/Generator.html" title="class in org.apache.nutch.crawl"><code>Generator</code></a> doesn't ensure that fetchlist parts
  for each map task are disjoint.
  </p>
  <p>
  <h4>Duplicate content</h4>
  Merging segments removes older content whenever possible (see below).
  However, this is NOT the same as de-duplication, which in addition removes
  identical content found at different URL-s. In other words, running
  DeleteDuplicates is still necessary.
  <p>
  For some types of data (especially ParseText) it's not possible to determine
  which version is really older. Therefore the tool always uses segment names
  as timestamps, for all types of input data. Segment names are compared in
  forward lexicographic order (0-9a-zA-Z), and data from segments with "higher"
  names will prevail. It follows then that it is extremely important that
  segments be named in an increasing lexicographic order as their creation time
  increases.
  </p>
  <p>
  <h4>Merging and indexes</h4>
  Merged segment gets a different name. Since Indexer embeds segment names in
  indexes, any indexes originally created for the input segments will NOT work
  with the merged segment. Newly created merged segment(s) need to be indexed
  afresh. This tool doesn't use existing indexes in any way, so if you plan to
  merge segments you don't have to index them prior to merging.</div>
 <dl>
 <dt><span class="simpleTagLabel">Author:</span></dt>
 <dd>Andrzej Bialecki</dd>
 </dl>
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 <td class="colFirst"><code>static class&nbsp;</code></td>
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 <div class="block">Wraps inputs in an <a href="../../../../org/apache/nutch/metadata/MetaWrapper.html" title="class in org.apache.nutch.metadata"><code>MetaWrapper</code></a>, to permit merging different types
  in reduce and use additional metadata.</div>
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 <td class="colFirst"><code>static class&nbsp;</code></td>
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 <td class="colFirst"><code>static class&nbsp;</code></td>
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 <div class="block">NOTE: in selecting the latest version we rely exclusively on the segment
  name (not all segment data contain time information).</div>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/nutch/segment/SegmentMerger.html#SegmentMerger--">SegmentMerger</a></span>()</code>&nbsp;</td>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/nutch/segment/SegmentMerger.html#SegmentMerger-org.apache.hadoop.conf.Configuration-">SegmentMerger</a></span>(<a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configuration.html?is-external=true" title="class or interface in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</code>&nbsp;</td>
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 <td class="colFirst"><code>static void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/nutch/segment/SegmentMerger.html#main-java.lang.String:A-">main</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>[]&nbsp;args)</code>&nbsp;</td>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/nutch/segment/SegmentMerger.html#merge-org.apache.hadoop.fs.Path-org.apache.hadoop.fs.Path:A-boolean-boolean-long-">merge</a></span>(<a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/fs/Path.html?is-external=true" title="class or interface in org.apache.hadoop.fs">Path</a>&nbsp;out,
      <a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/fs/Path.html?is-external=true" title="class or interface in org.apache.hadoop.fs">Path</a>[]&nbsp;segs,
      boolean&nbsp;filter,
      boolean&nbsp;normalize,
      long&nbsp;slice)</code>&nbsp;</td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/nutch/segment/SegmentMerger.html#run-java.lang.String:A-">run</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>[]&nbsp;args)</code>&nbsp;</td>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/nutch/segment/SegmentMerger.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></span>(<a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configuration.html?is-external=true" title="class or interface in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</code>&nbsp;</td>
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 <code><a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configured.html?is-external=true#getConf--" title="class or interface in org.apache.hadoop.conf">getConf</a></code></li>
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 <code><a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configurable.html?is-external=true#getConf--" title="class or interface in org.apache.hadoop.conf">getConf</a></code></li>
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 <pre>public&nbsp;SegmentMerger()</pre>
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 <pre>public&nbsp;SegmentMerger(<a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configuration.html?is-external=true" title="class or interface in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</pre>
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 <h4>setConf</h4>
 <pre>public&nbsp;void&nbsp;setConf(<a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configuration.html?is-external=true" title="class or interface in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</pre>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configurable.html?is-external=true#setConf-org.apache.hadoop.conf.Configuration-" title="class or interface in org.apache.hadoop.conf">setConf</a></code>&nbsp;in interface&nbsp;<code><a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/conf/Configurable.html?is-external=true" title="class or interface in org.apache.hadoop.conf">Configurable</a></code></dd>
 <dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
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 <h4>merge</h4>
 <pre>public&nbsp;void&nbsp;merge(<a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/fs/Path.html?is-external=true" title="class or interface in org.apache.hadoop.fs">Path</a>&nbsp;out,
                   <a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/fs/Path.html?is-external=true" title="class or interface in org.apache.hadoop.fs">Path</a>[]&nbsp;segs,
                   boolean&nbsp;filter,
                   boolean&nbsp;normalize,
                   long&nbsp;slice)
            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/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</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>
 <dl>
 <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/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</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>
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 <h4>run</h4>
 <pre>public&nbsp;int&nbsp;run(<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>[]&nbsp;args)
         throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/util/Tool.html?is-external=true#run-java.lang.String:A-" title="class or interface in org.apache.hadoop.util">run</a></code>&nbsp;in interface&nbsp;<code><a href="https://hadoop.apache.org/docs/r3.1.3/api/org/apache/hadoop/util/Tool.html?is-external=true" title="class or interface in org.apache.hadoop.util">Tool</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>args</code> - </dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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 <h4>main</h4>
 <pre>public static&nbsp;void&nbsp;main(<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>[]&nbsp;args)
                  throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
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 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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