I met an error when i using hive transform features

Question

java.lang.RuntimeException: Hive Runtime Error while closing operators at org.apache.hadoop.hive.ql.exec.ExecMapper.close(ExecMapper.java:226) at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:436) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372) at org.apache.hadoop.mapred.Child$4.run(Child.java:255) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1136) at org.apache.hadoop.mapred.Child.main(Child.java:249) Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: [Error 20003]: An error occurred when trying to close the Operator running your custom script. at org.apache.hadoop.hive.ql.exec.ScriptOperator.close(ScriptOperator.java:486) at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:567) at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:567) at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:567) at org.apache.hadoop.hive.ql.exec.ExecMapper.close(ExecMapper.java:193) ... 8 more The HQL script as follow:

SELECT
  TRANSFORM (userid, movieid, rating)
  USING 'python /home/daxingyu930/test_data_mapper2.py'
  AS userid, movieid, rating
;

the python script is very simple, using \t to split lines.

I have tested the python script in Linux with follow shell script:

cat test_data/u_data.txt | python test_data_mapper2.py

Pleas give me some idea about the question, it drive me crazy and make me cant sleep. Thanks very much.

Answer 1

before using your custom script, you should add your scripts into distributed cache.

eg.

add file  /home/daxingyu930/test_data_mapper2.py;

SELECT
    TRANSFORM (userid, movieid, rating)
    USING 'python test_data_mapper2.py'
    AS userid, movieid, rating
;