The primary hadoop mapreduce several small cases, including word count, topk, single-table association, multi-table association, data sorting, data deduplication, data grouping, for people new to understand the process of hadoop mapreduce

mapr\CreateIndex.java
....\DataGrouping.java
....\DataSort.java
....\MultiTableJoin.java
....\SingleTableJoin.java
....\TopK.java
....\WordCount.java
mapr

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