添加文件夹名称以输出Pig Latin [英] Add folder name to output Pig Latin

问题描述

我在HDFS中具有下一个目录结构:

I have next directory structure in HDFS:

logs_folder
   |---2021-03-01
          |---log1
          |---log2
          |---log3
       2021-03-02
          |---log1
          |---log2
       2021-03-03
          |---log1
          |---log2
...

日志由文本数据组成.数据中没有日期，因为它已经在文件夹名称中.我想读取所有日志并将其保存为以下格式:

Logs are made up of text data. There is no date in the data because it is already in the folder name. I want to read all the logs and save them in the following format:

date    id

其中id-日志中的字段，但我需要从文件夹名称中获取日期.预期输出:

where id - field from the log, but I need to take the date from the folder name. Expected output:

2021-03-01    id1
2021-03-01    id2
...
2021-03-02    id234
2021-03-02    id456
...

如何从文件夹名称添加日期到输出?

我发现一个严峻的问题，即如何在读取时向数据添加完整的路径名:

I found close question how to add full pathname to data on reading:

A = LOAD '/logs_folder/*' using PigStorage(',','-tagPath'); 
DUMP A  ;

我如何将当前输入的文件名合并到我的Pig Latin脚本中?

它非常接近，但是如何仅获取父文件夹名称而不是完整路径?

It is very close, but how to get parent folder name only instead of full path?

推荐答案

最后，我使用了这种方法:

Finally I used this approach:

1. 使用`-tagPathz属性加载数据-它将列添加到已加载数据中，其中包含每个文件的完整路径
2. 使用正则表达式仅过滤父文件夹

代码示例:

hadoop_data = LOAD '/logs_folder/*' USING PigStorage(',', '-tagPath') as (filepath:chararray, id:chararray, feature:chararray, value:chararray);
hadoop_data = FOREACH hadoop_data GENERATE id,(chararray)REGEX_EXTRACT(filepath,'.*\\/(.*)\\/',1) as path,
    feature,value;

我的数据包含3个字段-ID，功能，值，但是您可以看到其中有4个字段-添加了 filepath 字段！

My data consist of 3 fields - id, feature, value, but you can see there are 4 of them - filepath field was added!

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