Hadoop DistCp使用通配符? [英] Hadoop DistCp using wildcards?
问题描述
是否可以使用DistCp复制仅匹配特定模式的文件?
例如。对于/ foo我只想要* .log文件。
我意识到这是一个古老的线程。但我自己对这个问题的答案感兴趣 - 而且dk89在2013年也再次提出了问题。因此,我们继续:
$ b distcp不支持通配符。您可以做的最接近的是:
找到您想要复制的文件(来源),然后使用grep进行过滤,使用awk格式化hdfs,并将结果输出到一个输入文件列表:
hadoop dfs -lsr hdfs:// localhost:9000 / path / to / source / dir /
| grep -e webapp.log.3。 | awk'{printhdfs\:// localhost \:9000 /$ 8'}> input-files.txt
将输入文件列表放入hdfs中
hadoop dfs -put input-files.txt。
创建目标目录
hadoop dfs -mkdir hdfs:// localhost:9000 / path / to / target /
使用输入文件列表运行distcp并指定目标hdfs目录:
hadoop distcp -i -f input -files.txt hdfs:// localhost:9000 / path / to / target /
Is it possible to use DistCp to copy only files that match a certain pattern? For example. For /foo I only want *.log files.
I realize this is an old thread. But I was interested in the answer to this question myself - and dk89 also asked again in 2013. So here we go:
distcp does not support wildcards. The closest you can do is to:
Find the files you want to copy (sources), filter then using grep, format for hdfs using awk, and output the result to an "input-files" list:
hadoop dfs -lsr hdfs://localhost:9000/path/to/source/dir/
| grep -e webapp.log.3. | awk '{print "hdfs\://localhost\:9000/" $8'} > input-files.txt
Put the input-files list into hdfs
hadoop dfs -put input-files.txt .
Create the target dir
hadoop dfs -mkdir hdfs://localhost:9000/path/to/target/
Run distcp using the input-files list and specifying the target hdfs dir:
hadoop distcp -i -f input-files.txt hdfs://localhost:9000/path/to/target/
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