Type mismatch error in key from map, when doing GROUP on PigStorageSchema()
variable
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Key: PIG-1830
URL: https://issues.apache.org/jira/browse/PIG-1830
Project: Pig
Issue Type: Bug
Reporter: Mitesh Singh Jat
Pig fails when we try to GROUP data loaded via PigStorageSchema.
{code lang=java}
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 lang=java}
{"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}
Sample input file '''input/PigStorageSchema/pss.in'''
{code lang=java}
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 lang=java}
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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