Recent questions tagged mapreduce

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mapreduce - How to get the input file name in the mapper in a Hadoop program?

How I can get the name of the input file within a mapper? I have multiple input files stored in the input ... which file the mapper has read. 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 ... /hadoop-how-to-do-secondary-sort-on_25.html Question&Answers:os...

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

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578 views

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mapreduce - Merging two collections in MongoDB

I've been trying to use MapReduce in MongoDB to do what I think is a simple procedure. I don't know if ... always output to value or whatever else you name it? Question&Answers:os...

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

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mapreduce - Would an HBase Scan Performs Better with Multiple Column Families or Single Column Family?

I would like to store an object (payload) along with some metadata in HBase. Then I would like to run ... -hbase-scan-performs-better-with-multiple-column-families-or-single-colu...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mapreduce - How to write 'map only' hadoop jobs?

I'm a novice on hadoop, I'm getting familiar to the style of map-reduce programing but now I faced a ... //stackoverflow.com/questions/9394409/how-to-write-map-only-hadoop-jobs...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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647 views

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mapreduce - How to get the input file name in the mapper in a Hadoop program?

How I can get the name of the input file within a mapper? I have multiple input files stored in the input directory, ... -get-the-input-file-name-in-the-mapper-in-a-hadoop-program...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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735 views

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mapreduce - How to get the input file name in the mapper in a Hadoop program?

How I can get the name of the input file within a mapper? I have multiple input files stored in the input directory, ... -get-the-input-file-name-in-the-mapper-in-a-hadoop-program...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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624 views

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mapreduce - How does Hadoop perform input splits?

This is a conceptual question involving Hadoop/HDFS. Lets say you have a file containing 1 billion lines. ... .com/questions/2831507/how-does-hadoop-perform-input-splits...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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605 views

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mapreduce - How does Hadoop perform input splits?

This is a conceptual question involving Hadoop/HDFS. Lets say you have a file containing 1 billion lines. ... .com/questions/2831507/how-does-hadoop-perform-input-splits...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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613 views

1 answer

mapreduce - python extract vowels from words

I am reading in a string of words and trying to retrieve all the vowels in them but not having much ... ://stackoverflow.com/questions/66057534/python-extract-vowels-from-words...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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660 views

1 answer

mapreduce - python extract vowels from words

I am reading in a string of words and trying to retrieve all the vowels in them but not having much ... ://stackoverflow.com/questions/66057534/python-extract-vowels-from-words...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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3.6k views

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mapreduce 跑不满资源这是为什么？

如图，我提交了一个MapReduce任务，这个任务的map数有很多，但是在队列资源没满的情况下，同时执行的map数缺很小，队列的配置也在截图中，请问如何提高map同时运行的个数。...

asked Jan 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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