无法将pig元组传递给python UDF [英] Unable to pass pig tuple to python UDF

问题描述

我有master.txt，它有10K条记录，所以它的每一行都是一个元组&整个相同的需求被传递给python UDF。由于它有多个记录，所以在存储p2preportmap时出现以下错误。请帮助

错误如下：

无法打开别名的迭代器p2preportmap。后端错误：
org.apache.pig.backend.executionengine.ExecException：错误0：标量
在输出中有多行。第一：（010301，MTS，MM），第二
：（010B06，MTS，TN）（常见原因：JOIN，然后FOREACH ... GENERATE
foo.bar应该是foo： ：bar）

Pig Script如下：

 使用streaming_python作为smsiuc_udfs注册'smsiuc_udf.py'; 
 cdrs = load'2016040111 *'使用PigStorage（'|'，' -  tagFile'）; 
 
 mastergtrec = load'master.txt'使用PigStorage（'，'，' -  tagFile'）; 
 
 mastergt = FOREACH mastergtrec GENERATE（chararray）UPPER（$ 1）as opcdpc，（chararray）UPPER（$ 2）as gtoptname，（chararray）UPPER（$ 3）as gtoptcircle; 
 
 mastergttup = FOREACH mastergt生成TOTUPLE（opcdpc，gtoptname，gtoptcircle）为mstgttup; 
 
 cdrrecord = FOREACH cdrs GENERATE（chararray）UPPER（$ 1）as aparty，（chararray）UPPER（$ 2）as bparty，$ 3 as smssentdate，$ 4 as smssenttime，（$ 29 =='6'？'作为状态，（chararray）UPPER（$ 26）作为srcgt，（chararray）UPPER（$ 27）作为destgt，（$ 12 ==''405899136999995'''MTSDEL-CDMA'：（$ 12 =='919875089998 '''MTSRAJ-GSM'：（$ 12 =='405899150999995'''MTSCHN-CDMA'：$ 12）））as smscgt，（chararray）$ 0 as cdrfname，（chararray）$ 13 as prepost; 
 
 filteredp2pcdrs = FILTER cdrrecord by smsiuc_udfs.pullp2pcdrs（aparty，bparty，srcgt，destgt）and status =='S'and SUBSTRING（smssentdate，4,6）=='$ MON'; 
 
 groupp2pcdrs = GROUP filteredp2pcdrs by（srcgt，destgt，aparty，bparty，smscgt，status，prepost）; 
 
 distinctp2pcdrs = FOREACH groupp2pcdrs {
 uniq = DISTINCT filteredp2pcdrs。（srcgt，destgt，aparty，bparty，smscgt，status，prepost）; 
 GENERATE FLATTEN（group），COUNT（uniq）as cnt; 
}; 
 
 p2preportmap = FOREACH distinctp2pcdrs GENERATE smsiuc_udfs.p2preport（srcgt，destgt，aparty，bparty，mastergttup），smscgt，status，prepost，cnt 
   
 
解决方案
这可以通过添加一个虚拟列然后分组完成。 p> dummmy = foreach p2preportmap生成1，$ 0，$ 1 .... 
 
 
分组=组虚拟$ 0 
I have master.txt which has 10K records, so each line of it will be a tuple & whole of the same needs to be passed to python UDF. Since it has multiple records, so on storing p2preportmap getting following error. Please help

Error is as follows:

  
Unable to open iterator for alias p2preportmap. Backend error :
  org.apache.pig.backend.executionengine.ExecException: ERROR 0: Scalar
  has more than one row in the output. 1st : (010301,MTS,MM), 2nd
  :(010B06,MTS,TN) (common cause: "JOIN" then "FOREACH ... GENERATE
  foo.bar" should be "foo::bar" )
Pig Script is as follows: 
REGISTER 'smsiuc_udf.py' using streaming_python as smsiuc_udfs;
cdrs = load '2016040111*' USING PigStorage('|','-tagFile') ;

mastergtrec = load 'master.txt' USING PigStorage(',','-tagFile');

mastergt = FOREACH mastergtrec GENERATE (chararray) UPPER($1) as opcdpc, (chararray) UPPER($2) as gtoptname,(chararray) UPPER($3) as gtoptcircle;

mastergttup = FOREACH mastergt generate TOTUPLE(opcdpc,gtoptname,gtoptcircle) as mstgttup;

cdrrecord = FOREACH cdrs GENERATE (chararray) UPPER($1) as aparty, (chararray) UPPER($2) as bparty,$3 as smssentdate,$4 as smssenttime,($29=='6' ? 'S' : 'F') as status,(chararray) UPPER($26) as srcgt,(chararray) UPPER($27) as destgt,($12=='405899136999995' ? 'MTSDEL-CDMA' : ($12=='919875089998' ? 'MTSRAJ-GSM' : ($12=='405899150999995' ? 'MTSCHN-CDMA' : $12) ) ) as smscgt, (chararray)$0 as cdrfname,(chararray) $13 as prepost;

filteredp2pcdrs = FILTER cdrrecord by smsiuc_udfs.pullp2pcdrs(aparty,bparty,srcgt,destgt) and status == 'S' and SUBSTRING(smssentdate,4,6) == '$MON';

groupp2pcdrs = GROUP filteredp2pcdrs by (srcgt,destgt,aparty,bparty,smscgt,status,prepost);

distinctp2pcdrs= FOREACH groupp2pcdrs {
uniq = DISTINCT filteredp2pcdrs.(srcgt,destgt,aparty,bparty,smscgt,status,prepost);
GENERATE FLATTEN(group),COUNT(uniq) as cnt;
};

p2preportmap = FOREACH distinctp2pcdrs GENERATE smsiuc_udfs.p2preport(srcgt,destgt,aparty,bparty,mastergttup ),smscgt,status,prepost,cnt

解决方案
This can be done by adding a dummy column and then grouping.

dummmy= foreach p2preportmap generate 1, $0,$1 ....

grouped = group dummy by $0

                        
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