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https://issues.apache.org/jira/browse/HIVE-12206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14961588#comment-14961588
]
Jason Dere commented on HIVE-12206:
-----------------------------------
Looks like this happens because Kryo's classloader set only once, during
initialization. If Kryo is initialized during one statement without the UDF
jar, then in the same session the jar is added and another statement is run
using the UDF, the Kryo classloader will not have been updated with the jar
containing the UDF.
> ClassNotFound Exception during query compilation with Tez and Union query and
> GenericUDFs
> -----------------------------------------------------------------------------------------
>
> Key: HIVE-12206
> URL: https://issues.apache.org/jira/browse/HIVE-12206
> Project: Hive
> Issue Type: Bug
> Components: Tez, UDF
> Reporter: Jason Dere
> Assignee: Jason Dere
>
> {noformat}
> -- union query without UDF
> explain
> select * from (select key + key from src limit 1) a
> union all
> select * from (select key + key from src limit 1) b;
> add jar /tmp/udf-2.2.0-snapshot.jar;
> create temporary function myudf as
> 'com.aginity.amp.hive.udf.UniqueNumberGenerator';
> -- Now try the query with the UDF
> explain
> select myudf()from (select key from src limit 1) a
> union all
> select myudf() from (select key from src limit 1) a;
> {noformat}
> Got error:
> {noformat}
> 2015-10-16 17:00:55,557 ERROR ql.Driver (SessionState.java:printError(963)) -
> FAILED: KryoException Unable to find class:
> com.aginity.amp.hive.udf.UniqueNumberGenerator
> Serialization trace:
> genericUDF (org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc)
> colExprMap (org.apache.hadoop.hive.ql.exec.SelectOperator)
> parentOperators (org.apache.hadoop.hive.ql.exec.UnionOperator)
> childOperators (org.apache.hadoop.hive.ql.exec.SelectOperator)
> childOperators (org.apache.hadoop.hive.ql.exec.LimitOperator)
> org.apache.hive.com.esotericsoftware.kryo.KryoException: Unable to find
> class: com.aginity.amp.hive.udf.UniqueNumberGenerator
> Serialization trace:
> genericUDF (org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc)
> colExprMap (org.apache.hadoop.hive.ql.exec.SelectOperator)
> parentOperators (org.apache.hadoop.hive.ql.exec.UnionOperator)
> childOperators (org.apache.hadoop.hive.ql.exec.SelectOperator)
> childOperators (org.apache.hadoop.hive.ql.exec.LimitOperator)
> at
> org.apache.hive.com.esotericsoftware.kryo.util.DefaultClassResolver.readName(DefaultClassResolver.java:138)
> at
> org.apache.hive.com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:115)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:656)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:99)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:507)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:776)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:139)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:17)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:694)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:507)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:776)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:112)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:694)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:507)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:776)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:112)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:694)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:507)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:776)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:112)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:694)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:507)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:776)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:112)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:18)
> at
> org.apache.hive.com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:672)
> at
> org.apache.hadoop.hive.ql.exec.Utilities.deserializeObjectByKryo(Utilities.java:1081)
> at
> org.apache.hadoop.hive.ql.exec.Utilities.deserializePlan(Utilities.java:970)
> at
> org.apache.hadoop.hive.ql.exec.Utilities.cloneOperatorTree(Utilities.java:928)
> at
> org.apache.hadoop.hive.ql.parse.GenTezUtils.removeUnionOperators(GenTezUtils.java:228)
> at
> org.apache.hadoop.hive.ql.parse.TezCompiler.generateTaskTree(TezCompiler.java:373)
> at
> org.apache.hadoop.hive.ql.parse.TaskCompiler.compile(TaskCompiler.java:205)
> at
> org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:10193)
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner.analyzeInternal(CalcitePlanner.java:211)
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:227)
> at
> org.apache.hadoop.hive.ql.parse.ExplainSemanticAnalyzer.analyzeInternal(ExplainSemanticAnalyzer.java:74)
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:227)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:424)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:308)
> at org.apache.hadoop.hive.ql.Driver.compileInternal(Driver.java:1122)
> at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1170)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1059)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1049)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:213)
> at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:165)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:376)
> at
> org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:311)
> at
> org.apache.hadoop.hive.cli.CliDriver.processReader(CliDriver.java:409)
> at
> org.apache.hadoop.hive.cli.CliDriver.processFile(CliDriver.java:425)
> at
> org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:714)
> at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:681)
> at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:621)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
> Caused by: java.lang.ClassNotFoundException:
> com.aginity.amp.hive.udf.UniqueNumberGenerator
> at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:270)
> at
> org.apache.hive.com.esotericsoftware.kryo.util.DefaultClassResolver.readName(DefaultClassResolver.java:136)
> ... 64 more
> {noformat}
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