hadoop cdh5的pig隐式转化(int到betyarray)不行了

cdh3上,pig支持int到chararray的隐式转化,但到cdh5不行。

pig code is as follows:

%default Cleaned_Log /user/usergroup_mdmp/test/cleaned/2015-01-05/5/part-r-00000

%default Industry_Path /user/usergroup_mdmp/test/report/historical/appcategory/2015/industry

origin_cleaned_data = LOAD '$Cleaned_Log' USING PigStorage(',')
AS (ad_network_id:chararray,
    app_id:chararray,
    app_category_id:chararray,
    quadkey:chararray);

category_data = foreach origin_cleaned_data generate (int)app_category_id;

industry_existed_Data = LOAD '$Industry_Path' USING PigStorage(',') AS (appcategory_id:chararray);

result = UNION category_data, industry_existed_Data;

dump result;
--STORE result INTO '/user/usergroup_mdmp/test/report/historical/hour/2015/test' USING PigStorage(',');

老Cdh3跑的好好的,

到cdh5报错:can‘t cast to bytearray。原来不能将int隐式转化为chararray了。

所以,合并前要合并成同一类型int。


其他:

        int到bytearray也不行

chararray到bytearray也不行:

category_data = foreach origin_cleaned_data generate (bytearray)app_category_id;

industry_existed_Data = LOAD '$Industry_Path' USING PigStorage(',') AS (appcategory_id:chararray);
result = UNION category_data, industry_existed_Data;


另外:

cdh5 的hadoop命令也有所改动

1,hadoop fs -mkdir /tt/xx :不能生成父路径不存在的路径,只能创建已存在目录下当前的一级目录。如果要创建多级不存在目录的路径,要用mkdir -p.

2,删除命令变为rm -r,原来的rmr 已经deprecated,还可以用


原文地址:https://www.cnblogs.com/cl1024cl/p/6205395.html