[HIVE-5279] Kryo cannot instantiate GenericUDAFEvaluator in GroupByDesc

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 0.13.0
• Component/s: Query Processor
• Assignee: Navis Ryu
• Reporter: Navis Ryu
• Created: 12/Sep/13 09:00
• Updated: 26/Sep/13 10:10
• Resolved: 25/Sep/13 06:43

Description

We didn't forced GenericUDAFEvaluator to be Serializable. I don't know how previous serialization mechanism solved this but, kryo complaints that it's not Serializable and fails the query.

The log below is the example,

java.lang.RuntimeException: com.esotericsoftware.kryo.KryoException: Class cannot be created (missing no-arg constructor): org.apache.hadoop.hive.serde2.objectinspector.StandardListObjectInspector
Serialization trace:
inputOI (org.apache.hadoop.hive.ql.udf.generic.GenericUDAFGroupOn$VersionedFloatGroupOnEval)
genericUDAFEvaluator (org.apache.hadoop.hive.ql.plan.AggregationDesc)
aggregators (org.apache.hadoop.hive.ql.plan.GroupByDesc)
conf (org.apache.hadoop.hive.ql.exec.GroupByOperator)
childOperators (org.apache.hadoop.hive.ql.exec.SelectOperator)
childOperators (org.apache.hadoop.hive.ql.exec.TableScanOperator)
aliasToWork (org.apache.hadoop.hive.ql.plan.MapWork)
	at org.apache.hadoop.hive.ql.exec.Utilities.getBaseWork(Utilities.java:312)
	at org.apache.hadoop.hive.ql.exec.Utilities.getMapWork(Utilities.java:261)
	at org.apache.hadoop.hive.ql.io.HiveInputFormat.init(HiveInputFormat.java:256)
	at org.apache.hadoop.hive.ql.io.HiveInputFormat.pushProjectionsAndFilters(HiveInputFormat.java:383)
	at org.apache.h

If this cannot be fixed in somehow, some UDAFs should be modified to be run on hive-0.13.0