问题描述
是否有hdfs命令按照时间戳，升序或降序列出HDFS目录中的文件？默认情况下， hdfs dfs -ls 命令提供未排序的文件列表。
Is there a hdfs command to list files in HDFS directory as per timestamp, ascending or descending? By default, hdfs dfs -ls command gives unsorted list of files.
当我搜索答案时，我得到的是一个解决方法，即 hdfs dfs -ls / tmp | sort -k6,7 。但有没有更好的方法，内置于 hdfs dfs 命令行？
When I searched for answers what I got was a workaround i.e. hdfs dfs -ls /tmp | sort -k6,7. But is there any better way, inbuilt in hdfs dfs commandline?
推荐答案
否，没有其他选项可基于日期时间对文件进行排序。
如果您使用的是hadoop版本< 2.7，你将不得不像你一样使用sort -k6,7：
No, there is no other option to sort the files based on datetime.
If you are using hadoop version < 2.7, you will have to use sort -k6,7 as you are doing:
hdfs dfs -ls /tmp | sort -k6,7
对于hadoop 2.7.x ，有以下选项可用：
And for hadoop 2.7.x ls command , there are following options available :
Usage: hadoop fs -ls [-d] [-h] [-R] [-t] [-S] [-r] [-u] <args>
Options:
-d: Directories are listed as plain files.
-h: Format file sizes in a human-readable fashion (eg 64.0m instead of 67108864).
-R: Recursively list subdirectories encountered.
-t: Sort output by modification time (most recent first).
-S: Sort output by file size.
-r: Reverse the sort order.
-u: Use access time rather than modification time for display and sorting.
因此，您可以轻松地对文件进行排序：
So you can easily sort the files:
hdfs dfs -ls -t -R (-r) /tmp
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