Cheolsoo Park created PIG-3893:
----------------------------------
Summary: Hash join followed by replicated join fails in Tez mode
Key: PIG-3893
URL: https://issues.apache.org/jira/browse/PIG-3893
Project: Pig
Issue Type: Sub-task
Components: tez
Affects Versions: tez-branch
Reporter: Cheolsoo Park
Assignee: Cheolsoo Park
Fix For: tez-branch
To reproduce the issue, run this query-
{code}
x = LOAD 'foo' AS (x:int, y:chararray);
y = LOAD 'bar' AS (x:int, y:chararray);
a = JOIN x BY x, y BY x;
z = LOAD 'zoo' AS (x:int, y:chararray);
b = JOIN a BY x::x, z BY x USING 'replicated';
DUMP b;
{code}
This fails with the following error-
{code}
: Container released by application,
AttemptID:attempt_1397437587062_0071_1_03_000000_3 Info:Error:
org.apache.pig.backend.executionengine.ExecException: ERROR 0:
java.lang.ClassCastException:
org.apache.tez.runtime.library.common.readers.ShuffledUnorderedKVReader cannot
be cast to org.apache.tez.runtime.library.api.KeyValuesReader
: at
org.apache.pig.backend.hadoop.executionengine.tez.POShuffleTezLoad.attachInputs(POShuffleTezLoad.java:108)
: at
org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor.initializeInputs(PigProcessor.java:202)
: at
org.apache.pig.backend.hadoop.executionengine.tez.PigProcessor.run(PigProcessor.java:141)
: at
org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.run(LogicalIOProcessorRuntimeTask.java:307)
: at
org.apache.hadoop.mapred.YarnTezDagChild$5.run(YarnTezDagChild.java:562)
: at java.security.AccessController.doPrivileged(Native
Method)
: at javax.security.auth.Subject.doAs(Subject.java:415)
: at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)
: at
org.apache.hadoop.mapred.YarnTezDagChild.main(YarnTezDagChild.java:551)
: Caused by: java.lang.ClassCastException:
org.apache.tez.runtime.library.common.readers.ShuffledUnorderedKVReader cannot
be cast to org.apache.tez.runtime.library.api.KeyValuesReader
: at
org.apache.pig.backend.hadoop.executionengine.tez.POShuffleTezLoad.attachInputs(POShuffleTezLoad.java:89)
: ... 8 more
{code}
The problem is that POLR that belongs to FRJoin is attached to POShuffleTezLoad
since replicated join runs in the same vertex as in hash join.
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