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Big Data Study Notes 13: MR cases - displays the highest temperature per year
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2020-01-19 09:54:00
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First, the preparatory work
1, start hadoop service
2, prepare the data file
2, the data file upload HDFS
Second, the implementation steps
1, create a Maven project GetMaxTemperatures
2, modify pom.xml file, add hadoop dependence
3, create a log4j.properties file in the resources directory
4, the first phase - in each row to read the file data
(1) write MaxMapper
(2) write MaxDriver
5, the second phase of work - to extract each row of data in the year with the temperature
(1) Modify MaxMapper
(2) repair
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Origin
blog.csdn.net/howard2005/article/details/103987758
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