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https://issues.apache.org/jira/browse/NUTCH-2029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lewis John McGibbney resolved NUTCH-2029.
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Resolution: Fixed
This issue has been resolved as it was fixed over in GORA-423. We can benefit
from it when we upgrade to Gora 0.6.1 which will be done for the 2.3.1 release.
> Mark.checkMark returns empty string when null is expected with mongodb storage
> ------------------------------------------------------------------------------
>
> Key: NUTCH-2029
> URL: https://issues.apache.org/jira/browse/NUTCH-2029
> Project: Nutch
> Issue Type: Bug
> Components: storage
> Affects Versions: 2.3
> Reporter: Alexander Yastrebov
> Fix For: 2.3.1
>
>
> Gora mongodb backend returns empty Utf8 for null field values.
> This leads to Mark.checkMark never returns null, so multiple checks on null
> fail e.g. in DbUpdateMapper, GeneratorMapper etc.
> Temporal fix is to check whether value is null or empty
> See patch
> https://github.com/newpointer/nutch/commit/4bdc0bab39ede7c01ee057c3429f5f0e90d5e48f
> and related gora issue
> https://issues.apache.org/jira/browse/GORA-423
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