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https://issues.apache.org/jira/browse/NUTCH-392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500603
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Doğacan Güney commented on NUTCH-392:
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From what I understand of MapFile.Writer code in hadoop, if you give
CompressionType as an argument in its constructor it overwrites the compression
value in config. So since nutch manually sets parse_text and parse_data to
RECORD compression ( and crawl_parse to NONE), we will not get the advantages
of BLOCK compression even if we set it in config.
BLOCK compression seems to work really great if you got the native libraries in
place, so IMHO it would be better to not manually set CompressionType and allow
people to set it to whatever they want in config.
> OutputFormat implementations should pass on Progressable
> --------------------------------------------------------
>
> Key: NUTCH-392
> URL: https://issues.apache.org/jira/browse/NUTCH-392
> Project: Nutch
> Issue Type: New Feature
> Components: fetcher
> Reporter: Doug Cutting
> Assignee: Andrzej Bialecki
> Fix For: 1.0.0
>
> Attachments: NUTCH-392.patch
>
>
> OutputFormat implementations should pass the Progressable they are passed to
> underlying SequenceFile implementations. This will keep reduce tasks from
> timing out when block writes are slow. This issue depends on
> http://issues.apache.org/jira/browse/HADOOP-636.
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