Question

我有35个Csv文件我想用Pig加载数据。我已尝试过以下尝试

1) A = LOAD '/home/mrinmoy/Desktop/Sampath Project/Household/{HLPCA-00000,HLPCA-01000,HLPCA-02000,HLPCA-03000,HLPCA-04000,HLPCA-05000,HLPCA-06000,HLPCA-07000,HLPCA-08000,HLPCA-09000,HLPCA-10000,HLPCA-11000,HLPCA-12000,HLPCA-13000,HLPCA-14000,HLPCA-15000,HLPCA-16000,HLPCA-17000,HLPCA-18000,HLPCA-19000,HLPCA-20000,HLPCA-21000,HLPCA-22000,HLPCA-23000,HLPCA-24000,HLPCA-25000,HLPCA-26000,HLPCA-27000,HLPCA-28000,HLPCA-29000,HLPCA-30000,HLPCA-31000,,HLPCA-32000,,HLPCA-33000,,HLPCA-34000,,HLPCA-35000}.csv' UsingPigStorage(',');

对于这次尝试，我收到了错误

014-10-06 00:32:07,130 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2999: Unexpected internal error. Can not create a Path from an empty string
Details at logfile: /home/mrinmoy/Desktop/Sampath Project/Household/pig_1412580582549.log

在下一次尝试中，我使用SomeLoader（）;

更改了脚本

2) A = LOAD '/home/mrinmoy/Desktop/Sampath Project/Household/{HLPCA-00000,HLPCA-01000,HLPCA-02000,HLPCA-03000,HLPCA-04000,HLPCA-05000,HLPCA-06000,HLPCA-07000,HLPCA-08000,HLPCA-09000,HLPCA-10000,HLPCA-11000,HLPCA-12000,HLPCA-13000,HLPCA-14000,HLPCA-15000,HLPCA-16000,HLPCA-17000,HLPCA-18000,HLPCA-19000,HLPCA-20000,HLPCA-21000,HLPCA-22000,HLPCA-23000,HLPCA-24000,HLPCA-25000,HLPCA-26000,HLPCA-27000,HLPCA-28000,HLPCA-29000,HLPCA-30000,HLPCA-31000,,HLPCA-32000,,HLPCA-33000,,HLPCA-34000,,HLPCA-35000}.csv' using SomeLoader();

但是我得到了错误说这个

2014-10-06 00:39:42,905 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 1070: Could not resolve SomeLoader using imports: [, org.apache.pig.builtin., org.apache.pig.impl.builtin.]
Details at logfile: /home/mrinmoy/Desktop/Sampath Project/Household/pig_1412580912789.log

Answer 1

Pig将始终加载目录中的所有文件。所以你只需要用CSV文件指定目录。

A = LOAD '/home/mrinmoy/Desktop/Sampath Project/Household/' using PigStorage(',');

请注意usingPigStorage()缺少空白。它应该是using PigStorage()。你有一些双逗号：...HLPCA-31000,,HLPCA-32000,,HLPCA-33000,,HLPCA-34000,,HLPCA-35000}...

Answer 2

Pig支持将文件名作为正则表达式提供。所以你可以提供类似的东西：

A = LOAD '/home/mrinmoy/Desktop/Sampath Project/Household/HLPCA*' Using PigStorage(',');

它将加载所有名称从“家庭目录”中的“HLPCA”开始的文件。

在PIG中加载多个文件

2 个答案: