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我在 HDFS 中有以下文件夹：

hdfs://x.x.x.x:8020/Air/BOOK/AE/DOM/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/AE/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/BH/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/IN/DOM/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/IN/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/KW/DOM/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/KW/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/ME/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/OM/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/Others/DOM/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/QA/DOM/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/QA/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/SA/DOM/20171001/2017100101
hdfs://x.x.x.x:8020/Air/BOOK/SA/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/SEARCH/AE/DOM/20171001/2017100101
hdfs://x.x.x.x:8020/Air/SEARCH/AE/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/SEARCH/BH/DOM/20171001/2017100101
hdfs://x.x.x.x:8020/Air/SEARCH/BH/INT/20171001/2017100101
hdfs://x.x.x.x:8020/Air/SEARCH/IN/DOM/20171001/2017100101
hdfs://x.x.x.x:8020/Air/SEARCH/IN/INT/20171001/2017100101

每个文件夹中有近 50 个文件。我的目的是合并文件夹中的所有文件以获取单个文件，同时将其从 HDFS 复制到 S3 上。我遇到的问题是带有groupBy 选项的正则表达式。我试过这个，这似乎不起作用：

s3-dist-cp --src hdfs:///Air/ --dest s3a://HadoopSplit/Air-merged/  --groupBy '.*/(\w+)/(\w+)/(\w+)/.*' --outputCodec lzo

该命令本身有效，但我没有将每个文件夹中的文件合并到一个文件中，这让我相信问题出在我的正则表达式上。

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1 回答 1

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我只是自己想出来的..正确的正则表达式是

.*/Air/(\w+)/(\w+)/(\w+)/.*/.*/.*

合并和复制的命令是：

s3-dist-cp --src hdfs:///Air/ --dest s3a://HadoopSplit/Air-merged/  --groupBy '.*/Air/(\w+)/(\w+)/(\w+)/.*/.*/.*' --outputCodec lzo
于 2017-10-19T16:11:14.487 回答