[jira] [Updated] (NUTCH-1416) Can not update the index

["Jianyun He (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NUTCH-1416?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jianyun He updated NUTCH-1416:
------------------------------

    Description: 
When we update the index,can not guarantee that the contents which be indexed is the latest.In the class IndexerMapReduce and method reduce(), it has the following code:
public void reduce(Text key, Iterator<NutchWritable> values,
                     OutputCollector<Text, NutchDocument> output, Reporter reporter) throws IOException {
   ……
   } else if (value instanceof ParseData) {  
      parseData = (ParseData)value;
   } else if (value instanceof ParseText) { 
      parseText = (ParseText)value;
   }
   ……
}
For example,30 days ago,I fetched the web page A,now I fetch it again. Then the key A will correspond to two ParseData objects(located in different segments).But in this code,it does not compare the fetch time and simply overwrites the previous value.So the final value maybe the old one.

  was:
When we update the index,can not guarantee that the contents which be indexed is the latest.In the class IndexerMapReduce and method reduce(), it has the following code:
public void reduce(Text key, Iterator<NutchWritable> values,
                     OutputCollector<Text, NutchDocument> output, Reporter reporter) throws IOException {
   ……
   } else if (value instanceof ParseData) {  
        parseData = (ParseData)value;
   } else if (value instanceof ParseText) { 
        parseText = (ParseText)value;
   }
   ……
}
For example,30 days ago,I fetched the web page A,now I fetch it again. Then the key A will correspond to two ParseData objects(located in different segments).But in this code,it does not compare the fetch time and simply overwrites the previous value.So the final value maybe the old one.

    
> Can not update the index
> ------------------------
>
>                 Key: NUTCH-1416
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1416
>             Project: Nutch
>          Issue Type: Bug
>          Components: indexer
>            Reporter: Jianyun He
>
> When we update the index,can not guarantee that the contents which be indexed is the latest.In the class IndexerMapReduce and method reduce(), it has the following code:
> public void reduce(Text key, Iterator<NutchWritable> values,
>                      OutputCollector<Text, NutchDocument> output, Reporter reporter) throws IOException {
>    ……
>    } else if (value instanceof ParseData) {  
>       parseData = (ParseData)value;
>    } else if (value instanceof ParseText) { 
>       parseText = (ParseText)value;
>    }
>    ……
> }
> For example,30 days ago,I fetched the web page A,now I fetch it again. Then the key A will correspond to two ParseData objects(located in different segments).But in this code,it does not compare the fetch time and simply overwrites the previous value.So the final value maybe the old one.

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