Alexander Yastrebov created NUTCH-2029:
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Summary: 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
Gora mongodb backend return 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
https://github.com/newpointer/nutch/commit/4bdc0bab39ede7c01ee057c3429f5f0e90d5e48f
See https://issues.apache.org/jira/browse/GORA-423
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