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From "Jianyun He (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (NUTCH-1416) Can not update the index
Date Tue, 10 Jul 2012 01:37:37 GMT

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

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

    Priority: Critical  (was: Major)
    
> 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
>            Priority: Critical
>
> 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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