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From "Jianhua Wang" <wjh_had...@163.com >
Subject about User scripte in HiveQL
Date Tue, 01 Mar 2011 02:19:45 GMT
Hi all,

      Recently, i have met a problem, and i can not solve it after some efforts. So I wanna
look for help here, and any help will be appreciated. Thanks!

      My case is depicted as below:

      I want to execute the HiveQL command : 

select transform(a.col) using '/home/pc/mypython.py' as (col string) from tmp_table a where
a.col2='01';

where the 'mypython.py' is a python script of mine.

I have built a environment of hadoop within the vmware machine on my single node PC-home,
and the command works well on this environment within only single node.

I also have a cluster of three PC servers, including node A, B, and C.

Then, I store the '/home/pc/mypython.py' on node A.

However, every time I issue the command to the cluster, i am always going to get the error
information like this: 

-------------------------------------------------------------------------------------------------------------------
Caused by: java.io.IOException: Cannot run program "/home/pc/mypython.py": java.io.IOException:
error=2, No such file or directory
         at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
         at org.apache.hadoop.hive.ql.exec.ScriptOperator.processOp(ScriptOperator.java:279)
         ... 20 more
    Caused by: java.io.IOException: java.io.IOException: error=2, No such file or directory
         at java.lang.UNIXProcess.(UNIXProcess.java:148)
         at java.lang.ProcessImpl.start(ProcessImpl.java:65)
         at java.lang.ProcessBuilder.start(ProcessBuilder.java:453)
         ... 21 more
    -------------------------------------------------------------------------------------------------------------------
By looking up the Job logs, these errors were reported by node B and node C. It seems that
the tasktracker B and C can not find the script. 
On hive wiki, I didn't find any instruction on how to place the user script.
What should I do to place my script in proper place? 
Thanks in advance for any reply!

2011-03-01 



Jianhua Wang 

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