Question

我发表了这样的声明：

--Insert a new column based on filename
Data = LOAD '/user/cloudera/Source_Data' using PigStorage('\t','-tagFile');

Data_Schema = FOREACH Data GENERATE
(chararray)$1 AS Date,
(chararray)$2 AS ID,
(chararray)$3 AS Interval,
(chararray)$4 AS Code,
(chararray)$5 AS S_In,
(chararray)$6 AS S_Out,
(chararray)$7 AS C_In,
(chararray)$8 AS C_Out,
(chararray)$9 AS Traffic;

--Split into different directories
SPLIT Data_Schema INTO Src1 IF (Date == '2016-06-25.txt'),
Src2 IF (Date == '2014-07-31.txt'),
Src3 IF (Date == '2016-01-01.txt');

STORE Src1 INTO '/user/cloudera/Source_DatA/2016-06-25' using PigStorage('\t');
STORE Src2 INTO '/user/cloudera/Source_Data/2014-07-31.txt' using PigStorage('\t');
STORE Src2 INTO '/user/cloudera/Source_Data/2016-01-01' using PigStorage('\t');

有一个我的原始源数据的例子：

10000 1388530800000 39 8.600870350350515 13.86183926855984 1.7218329193014124 3.424444103320796 25.972920214509095

但是当我执行它成功运行时，HDFS中的文件没有数据......

请注意，我根据文件名添加了一个新列。这就是为什么我在Foreach Statment中再增加一个专栏......

Answer 1

如果您的输入文件名为2016-06-25.txt，2014-07-31.txt和2016-01-01.txt，则新添加的列将由$0引用，并且它将包含文件名。你必须这样做：

Data_Schema = FOREACH Data GENERATE
(chararray)$0 AS Date,
(chararray)$1 AS ID,
...

或者只是在加载文件时指定模式，并保持原样：

Data = LOAD '/user/cloudera/Source_Data' using PigStorage('\t','-tagFile') as (Date:chararray, ID:chararray, ... ;

我的猪脚本正在将空文件创建到HDFS中

1 个答案: