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Posted to dev@pig.apache.org by "Dmitriy V. Ryaboy (JIRA)" <ji...@apache.org> on 2011/03/18 09:03:29 UTC
[jira] Closed: (PIG-1830) Type mismatch error in key from map, when
doing GROUP on PigStorageSchema() variable
[ https://issues.apache.org/jira/browse/PIG-1830?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dmitriy V. Ryaboy closed PIG-1830.
----------------------------------
> 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
> Fix For: 0.9.0
>
> Attachments: 1830-testpatch.tgz, 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.
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