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https://issues.apache.org/jira/browse/NUTCH-683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671129#action_12671129
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Andrzej Bialecki commented on NUTCH-683:
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+1.
> NUTCH-676 broke CrawlDbMerger
> -----------------------------
>
> Key: NUTCH-683
> URL: https://issues.apache.org/jira/browse/NUTCH-683
> Project: Nutch
> Issue Type: Bug
> Affects Versions: 1.0.0
> Reporter: Doğacan Güney
> Assignee: Doğacan Güney
> Priority: Minor
> Fix For: 1.0.0
>
> Attachments: crawldbmerger_v2.patch
>
>
> Switch to hadoop's MapWritable broke CrawlDbMerger. Part of the reason is
> that we reuse the same MapWritable instance during reduce
> which apparently is a big no-no for hadoop's MapWritable. Also, hadoop's
> MapWritable#putAll doesn't work (I think.... see HADOOP-5142),
> so we should also work around that.
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