[ https://issues.apache.org/jira/browse/PIG-1830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006125#comment-13006125 ]
Dmitriy V. Ryaboy commented on PIG-1830: ---------------------------------------- Turns out the AllLoader failures were unrelated, after all. Fixed in a different ticket. This is ready for review. > Type mismatch error in key from map, when doing GROUP on PigStorageSchema() > variable > ------------------------------------------------------------------------------------ > > Key: PIG-1830 > URL: https://issues.apache.org/jira/browse/PIG-1830 > Project: Pig > Issue Type: Bug > Reporter: Mitesh Singh Jat > Assignee: Dmitriy V. Ryaboy > Attachments: PIG_1830.patch > > > Pig fails when we try to GROUP data loaded via PigStorageSchema. > {code} > Events = LOAD 'input/PigStorageSchema' USING > org.apache.pig.piggybank.storage.PigStorageSchema(); > Sessions = GROUP Events BY name; > DUMP Sessions; > {code} > Schema file '''input/PigStorageSchema/.pig_schema''' > {code} > {"fields":[{"name":"name","type":55,"schema":null,"description":"autogenerated > from Pig Field > Schema"},{"name":"val","type":10,"schema":null,"description":"autogenerated > from Pig Field Schema"}],"version":0,"sortKeys":[],"sortKeyOrders":[]} > {code} > Header file '''input/PigStorageSchema/.pig_header''' > {code} > name val > {code} > Sample input file '''input/PigStorageSchema/pss.in''' > {code} > peter 1 > samir 3 > michael 4 > peter 2 > peter 4 > samir 1 > {code} > On running the above pig script, the following error is received. > {code} > 2010-12-15 08:07:58,367 WARN org.apache.hadoop.mapred.Child: Error running > child > java.io.IOException: Type mismatch in key from map: expected > org.apache.pig.impl.io.NullableText, recieved > org.apache.pig.impl.io.NullableBytesWritable > at > org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:898) > at > org.apache.hadoop.mapred.MapTask$NewOutputCollector.write(MapTask.java:600) > at > org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80) > at > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.collect(PigMapReduce.java:116) > at > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:238) > at > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:231) > at > org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:53) > at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144) > at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:674) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:335) > at org.apache.hadoop.mapred.Child$4.run(Child.java:242) > 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:1062) > at org.apache.hadoop.mapred.Child.main(Child.java:236) > {code} > On changing "type" of "name" from 55(chararray) to 50(bytearray), the > GROUP-BY worked. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira