Recent questions tagged mapreduce

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mapreduce - Best way to do one-to-many "JOIN" in CouchDB

I am looking for a CouchDB equivalent to "SQL joins". In my example there are CouchDB documents that are list ... how to do this shorter. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mapreduce - hadoop map reduce secondary sorting

Can any one explain me how secondary sorting works in hadoop ? Why must one use GroupingComparator and how does ... do-secondary-sort-on_25.html See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mapreduce - Specify minimum number of generated files from Hive insert

I am using Hive on AWS EMR to insert the results of a query into a Hive table partitioned by date. Although ... the maximum size of each file? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mapreduce - Hadoop speculative task execution

In Google's MapReduce paper, they have a backup task, I think it's the same thing with speculative task ... the intermediate status and data?) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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