[jira] [Work started] (NUTCH-1712) Use MultipleInputs in Injector to make it a single mapreduce job

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

     [ https://issues.apache.org/jira/browse/NUTCH-1712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on NUTCH-1712 started by Sebastian Nagel.
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> Use MultipleInputs in Injector to make it a single mapreduce job
> ----------------------------------------------------------------
>
>                 Key: NUTCH-1712
>                 URL: https://issues.apache.org/jira/browse/NUTCH-1712
>             Project: Nutch
>          Issue Type: Improvement
>          Components: injector
>    Affects Versions: 1.7
>            Reporter: Tejas Patil
>            Assignee: Sebastian Nagel
>         Attachments: NUTCH-1712-trunk.v1.patch
>
>
> Currently Injector creates two mapreduce jobs:
> 1. sort job: get the urls from seeds file, emit CrawlDatum objects.
> 2. merge job: read CrawlDatum objects from both crawldb and output of sort job. Merge and emit final CrawlDatum objects.
> Using MultipleInputs, we can read CrawlDatum objects from crawldb and urls from seeds file simultaneously and perform inject in a single map-reduce job.
> Also, here are additional things covered with this jira:
> 1. Pushed filtering and normalization above metadata extraction so that the unwanted records are ruled out quickly.
> 2. Migrated to new mapreduce API
> 3. Improved documentation 
> 4. New junits with better coverage
> Relevant discussion over nutch-dev can be found here:
> http://mail-archives.apache.org/mod_mbox/nutch-dev/201401.mbox/%3CCAFKhtFyXO6WL7gyUV+a5Y1pzNtdCoqPz4jz_up_bkp9cJe80kg@mail.gmail.com%3E



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