Pig does not handle Chinese characters (in both the parameter subsitution using
-param_file or embedded in the Pig script) correctly
------------------------------------------------------------------------------------------------------------------------------------
Key: PIG-774
URL: https://issues.apache.org/jira/browse/PIG-774
Project: Pig
Issue Type: Bug
Components: grunt, impl
Affects Versions: 0.0.0
Reporter: Viraj Bhat
Priority: Critical
Fix For: 0.0.0
I created a very small test case in which I did the following.
1) Created a UTF-8 file which contained a query string in Chinese and wrote it
to HDFS. I used this dfs file as an input for the tests.
2) Created a parameter file which also contained the same query string as in
Step 1.
3) Created a Pig script which takes in the parametrized query string and hard
coded Chinese character.
================================================================
Pig script: chinese_data.pig
================================================================
{code}
rmf chineseoutput;
I = load '/user/viraj/chinese.txt' using PigStorage('\u0001');
J = filter I by $0 == '$querystring';
--J = filter I by $0 == ' 歌手 香港情牽女人心演唱會';
store J into 'chineseoutput';
dump J;
{code}
=================================================================
Parameter file: nextgen_paramfile
=================================================================
queryid=20090311
querystring=' 歌手 香港情牽女人心演唱會'
=================================================================
Input file: /user/viraj/chinese.txt
=================================================================
shell$ hadoop fs -cat /user/viraj/chinese.txt
歌手 香港情牽女人心演唱會
=================================================================
I ran the above set of inputs in the following ways:
Run 1:
=================================================================
java -cp pig.jar:/home/viraj/hadoop-0.18.0-dev/conf/ -Dhod.server=''
org.apache.pig.Main -param_file nextgen_paramfile chinese_data.pig
=================================================================
2009-04-22 01:31:35,703 [Thread-7] WARN org.apache.hadoop.mapred.JobClient -
Use GenericOptionsParser for parsing the
arguments. Applications should implement Tool for the same.
2009-04-22 01:31:40,700 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher -
0% complete
2009-04-22 01:31:50,720 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher -
100% complete
2009-04-22 01:31:50,720 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher -
Success!
=================================================================
Run 2: removed the parameter substitution in the Pig script instead used the
following statement.
=================================================================
J = filter I by $0 == ' 歌手 香港情牽女人心演唱會';
=================================================================
java -cp pig.jar:/home/viraj/hadoop-0.18.0-dev/conf/ -Dhod.server=''
org.apache.pig.Main chinese_data_withoutparam.pig
=================================================================
2009-04-22 01:35:22,402 [Thread-7] WARN org.apache.hadoop.mapred.JobClient -
Use GenericOptionsParser for parsing the
arguments. Applications should implement Tool for the same.
2009-04-22 01:35:27,399 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher -
0% complete
2009-04-22 01:35:32,415 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher -
100% complete
2009-04-22 01:35:32,415 [main] INFO
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher -
Success!
=================================================================
In both cases:
=================================================================
ucdev6 01:39:22 ~/pig-svn/trunk $ hadoop fs -ls /user/viraj/chineseoutput
Found 2 items
drwxr-xr-x - viraj supergroup 0 2009-04-22 01:37
/user/viraj/chineseoutput/_logs
-rw-r--r-- 3 viraj supergroup 0 2009-04-22 01:37
/user/viraj/chineseoutput/part-00000
=================================================================
Additionally tried the dry-run option to figure out if the parameter
substitution was occurring properly.
=================================================================
java -cp pig.jar:/home/viraj/hadoop-0.18.0-dev/conf/ -Dhod.server=''
org.apache.pig.Main -param_file nextgen_paramfile -r chinese_data.pig
=================================================================
shell$ file chinese_data.pig.substituted
chinese_data.pig.substituted: ASCII text
shell$ cat chinese_data.pig.substituted
{code}
rmf chineseoutput;
I = load '/user/viraj/chinese.txt' using PigStorage('\u0001');
J = filter I by $0 == ' ?????? ??????????????????????????????';
store J into 'chineseoutput';
{code}
=================================================================
This issue has to do with the parser not handling UTF-8 data.
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