[jira] [Updated] (NUTCH-2381) In some situations the class TextProfileSignature gives different signatures for the same text "profile" page.

["Sebastian Nagel (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NUTCH-2381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Nagel updated NUTCH-2381:
-----------------------------------
    Fix Version/s:     (was: 1.15)
                   1.16

> In some situations the class TextProfileSignature gives different signatures for the same text "profile" page.
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: NUTCH-2381
>                 URL: https://issues.apache.org/jira/browse/NUTCH-2381
>             Project: Nutch
>          Issue Type: Bug
>          Components: crawldb
>    Affects Versions: 1.13
>            Reporter: Rodrigo Joni Sestari
>            Priority: Major
>              Labels: signature
>             Fix For: 1.16
>
>
> In some situations the class TextProfileSignature gives different signatures for the same text "profile" page.
> The method TextProfileSignature.calculate uses a HashMap to salve the tokens, after some process, the tokens come sorted by decreasing frequency.
> For some pages like "http://curia.europa.eu/jcms/" the text "profile" is the same but the signature come different for each fetch.
> Its happens because the tokens are sorted only by decreasing frequency. Tokens with the same frequency maybe not have the same order in different fetchs.
> The HashMap no guarantees as to the order of the map and  not guarantee that the order will remain constant over time.
> My suggestion is change the methods TokenComparator.compare  in order to sort by frequency and Name.
> Rodrigo



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