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https://issues.apache.org/jira/browse/NUTCH-1403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941785#comment-16941785
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ASF GitHub Bot commented on NUTCH-1403:
---------------------------------------

sebastian-nagel commented on pull request #458: fix for NUTCH-1403 contributed 
by aalbahem
URL: https://github.com/apache/nutch/pull/458#discussion_r330021393
 
 

 ##########
 File path: 
src/plugin/scoring-metadata/src/java/org/apache/nutch/scoring/metadata/MetadataScoringFilter.java
 ##########
 @@ -0,0 +1,178 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.nutch.scoring.metadata;
+
+import java.util.Collection;
+import java.util.Map.Entry;
+import java.util.Iterator;
+import java.util.List;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.conf.Configured;
+import org.apache.hadoop.io.Text;
+import org.apache.nutch.crawl.CrawlDatum;
+import org.apache.nutch.crawl.Inlinks;
+import org.apache.nutch.indexer.NutchDocument;
+import org.apache.nutch.parse.Parse;
+import org.apache.nutch.parse.ParseData;
+import org.apache.nutch.protocol.Content;
+import org.apache.nutch.scoring.ScoringFilter;
+import org.apache.nutch.scoring.ScoringFilterException;
+
+
+/**
+ * For documentation:
+ * 
+ * {@link org.apache.nutch.scoring.metadata}
+ */
+public class MetadataScoringFilter extends Configured implements ScoringFilter 
{
+
+  public static final String METADATA_DATUM   = "scoring.db.md";
 
 Review comment:
   The three new properties should be "documented" in `conf/nutch-default.xml`.
 
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> Add default ScoringFilter for manipulating metadata 
> ----------------------------------------------------
>
>                 Key: NUTCH-1403
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1403
>             Project: Nutch
>          Issue Type: Improvement
>            Reporter: Julien Nioche
>            Assignee: Sebastian Nagel
>            Priority: Major
>             Fix For: 1.16
>
>
> This is currently done by the urlmeta plugin, which has too vague a name and 
> a redundant indexing filter now that we have the index-metadata plugin. This 
> scoring filter would help defining which metadata to pass from : 
> - the crawl metadata to the content metadata
> - the content metadata to the parse metadata
> - the parse metadata to the crawldatum for the outlinks
> I'd make this scoring filter available by default i.e. not in a separate 
> plugin as its functionalities are commonly used.   



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