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https://issues.apache.org/jira/browse/HIVE-7711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096789#comment-14096789
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Dr. Christian Betz commented on HIVE-7711:
------------------------------------------
ok, got my UDF to be usable with the config
hive.plan.serialization.format=javaXML (after digging through the sourcecode).
I did find the following snippet in
https://github.com/apache/hive/blob/branch-0.13/ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java,
line 934:
removeField(kryo, Operator.class, "colExprMap");
which is "missing"(?) in cloningQueryPlanKryo (lines 947-958).
IMHO, the best solution to this problem would involve adding appropriate
serializers to Kryo, e.g. from the https://github.com/magro/kryo-serializers
project (not in my case, but just as an example). To use this, one needs to
expose the Kryo registry (not so good) or (in order to be thread-safe) extend
the registry with self-registered serializers. One way could expose those
serializers in GenericUDF::getSerializerMap to be overwritten, mapping classes
to serializers. However, this could result in major security issues I'm not yet
aware of.
> Error Serializing GenericUDF
> ----------------------------
>
> Key: HIVE-7711
> URL: https://issues.apache.org/jira/browse/HIVE-7711
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.13.0
> Reporter: Dr. Christian Betz
>
> I get an exception running a job with a GenericUDF in HIVE 0.13.0 (which was
> ok in HIVE 0.12.0).
> The org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc is serialized
> using Kryo, trying to serialize stuff in my GenericUDF which is not
> serializable (doesn't implement Serializable).
> Switching to Kryo made the comment in ExprNodeGenericFuncDesc obsolte:
> "/**
> * In case genericUDF is Serializable, we will serialize the object.
> *
> * In case genericUDF does not implement Serializable, Java will remember
> the
> * class of genericUDF and creates a new instance when deserialized. This is
> * exactly what we want.
> */"
> Find the stacktrace below, however, the description above should be clear.
> Exception in thread "main"
> org.apache.hive.com.esotericsoftware.kryo.KryoException:
> java.lang.UnsupportedOperationException
> Serialization trace:
> value (java.util.concurrent.atomic.AtomicReference)
> state (clojure.lang.Atom)
> state (udfs.ArraySum)
> genericUDF (org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc)
> colExprMap (org.apache.hadoop.hive.ql.exec.SelectOperator)
> childOperators (org.apache.hadoop.hive.ql.exec.TableScanOperator)
> aliasToWork (org.apache.hadoop.hive.ql.plan.MapWork)
> mapWork (org.apache.hadoop.hive.ql.plan.MapredWork)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:125)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:507)
> 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.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.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.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.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.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.readObject(Kryo.java:672)
> at
> org.apache.hadoop.hive.ql.exec.Utilities.deserializeObjectByKryo(Utilities.java:918)
> at
> org.apache.hadoop.hive.ql.exec.Utilities.deserializePlan(Utilities.java:826)
> at
> org.apache.hadoop.hive.ql.exec.Utilities.deserializePlan(Utilities.java:840)
> at
> org.apache.hadoop.hive.ql.exec.mr.ExecDriver.main(ExecDriver.java:738)
> 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.main(RunJar.java:212)
> Caused by: java.lang.UnsupportedOperationException
> at clojure.lang.APersistentMap.put(APersistentMap.java:287)
> at
> org.apache.hive.com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:140)
> 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)
> ... 41 more
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