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https://issues.apache.org/jira/browse/HIVE-5279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13769989#comment-13769989
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Leo Romanoff commented on HIVE-5279:
------------------------------------
Regarding the issue with Kryo's exception about no-arg constructor:
Please read this section: https://code.google.com/p/kryo/#Object_creation
Basically, you can force Kryo to create objects without invoking any
constructor at all, but you should be careful with it and your class should be
written in such a way that it can handle it.
-Leo
> Kryo cannot instantiate GenericUDAFEvaluator in GroupByDesc
> -----------------------------------------------------------
>
> Key: HIVE-5279
> URL: https://issues.apache.org/jira/browse/HIVE-5279
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Navis
> Assignee: Navis
> Priority: Critical
> Attachments: 5279.patch, D12963.1.patch, D12963.2.patch,
> D12963.3.patch
>
>
> 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,
> {noformat}
> 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
> {noformat}
> If this cannot be fixed in somehow, some UDAFs should be modified to be run
> on hive-0.13.0
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