Incorrect map output key type in MultiQuery optimization
--------------------------------------------------------
Key: PIG-1108
URL: https://issues.apache.org/jira/browse/PIG-1108
Project: Pig
Issue Type: Bug
Affects Versions: 0.6.0
Reporter: Ankur
When trying to merge 2 split plans, one of which never progresses along an M/R
boundary, PIG sets the map-output key type incorrectly resulting in the
following error:-
java.io.IOException: Type mismatch in key from map: expected
org.apache.pig.impl.io.NullableText, recieved
org.apache.pig.impl.io.NullableTuple
at
org.apache.hadoop.mapred.MapTask$MapOutputBuffer.collect(MapTask.java:807)
at
org.apache.hadoop.mapred.MapTask$OldOutputCollector.collect(MapTask.java:466)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.collect(PigMapReduce.java:108)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.runPipeline(PigMapBase.java:249)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapBase.map(PigMapBase.java:238)
at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce$Map.map(PigMapReduce.java:93)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
at org.apache.hadoop.mapred.Child.main(Child.java:159)
Here is a small script to be used a reproducible test case
rmf plan1
rmf plan2
A = LOAD 'data' USING PigStorage() as (a: int, b: chararray);
SPLIT A into plan1 IF (a>5), plan2 IF (a<5);
B = GROUP plan1 BY b;
C = FOREACH B {
tmp = ORDER plan1 BY a desc;
GENERATE FLATTEN(group) as b, tmp;
};
D = FILTER C BY b is not null;
STORE D into 'plan1';
STORE plan2 into 'plan2';
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
