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https://issues.apache.org/jira/browse/STORM-3582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17081733#comment-17081733
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Julien Nioche commented on STORM-3582:
--------------------------------------
have commented in STORM-3620
> Kryo errors when using custom serialization
> -------------------------------------------
>
> Key: STORM-3582
> URL: https://issues.apache.org/jira/browse/STORM-3582
> Project: Apache Storm
> Issue Type: Bug
> Components: storm-core
> Affects Versions: 2.1.0
> Reporter: Julien Nioche
> Priority: Blocker
>
> (this has been reported on the user list in January and previously by a
> different user)
>
> ------------------------------------------------------------------------------------
>
> My code works fine with Storm 1.x but the workers crash constantly with Storm
> 2.x
>
> Some exceptions look like
>
> {{_com.esotericsoftware.kryo.KryoException: Buffer underflow._}}
> {{_at com.esotericsoftware.kryo.io.Input.require(Input.java:199)
> ~[kryo-3.0.3.jar:?]_}}
> {{_at com.esotericsoftware.kryo.io.Input.readUtf8_slow(Input.java:575)
> ~[kryo-3.0.3.jar:?]_}}
> {{_at com.esotericsoftware.kryo.io.Input.readUtf8(Input.java:553)
> ~[kryo-3.0.3.jar:?]_}}
> {{_at com.esotericsoftware.kryo.io.Input.readString(Input.java:483)
> ~[kryo-3.0.3.jar:?]_}}
> {{whereas others are}}
>
> {{_2020-01-21 11:13:39.368 o.a.s.m.n.StormServerHandler
> Netty-server-localhost-6701-worker-1 [ERROR] server errors in handling the
> request_}}
> {{_com.esotericsoftware.kryo.KryoException: Encountered unregistered class
> ID: *95*
> at
> com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:137)
> ~[kryo-3.0.3.jar:?]
> at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:670) ~[kryo-3.0.3.jar:?]
> at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:781)
> ~[kryo-3.0.3.jar:?]
> at
> com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:153)
> ~[kryo-3.0.3.jar:?]
> at
> com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:39)
> ~[kryo-3.0.3.jar:?]
> at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:793)
> ~[kryo-3.0.3.jar:?]
> at
> com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:134)
> ~[kryo-3.0.3.jar:?]
> at
> com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:40)
> ~[kryo-3.0.3.jar:?]
> at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:689)
> ~[kryo-3.0.3.jar:?]
> at
> org.apache.storm.serialization.KryoValuesDeserializer.deserializeFrom(KryoValuesDeserializer.java:31)
> ~[storm-client-2.1.0.jar:2.1.0]_}}
> {{the class ID values are random integers. }}
> {{}}
> The tuples in my topologies contain mostly standard classes like String; the
> only exception is the following class
>
> [https://github.com/DigitalPebble/storm-crawler/blob/2.x/core/src/main/java/com/digitalpebble/stormcrawler/Metadata.java#L41]
>
> for which we specify a custom serialization for Kryo.
>
> My configurations contain
>
> | topology.kryo.register:|- com.digitalpebble.stormcrawler.Metadata|
> to register the custom class.
>
> The user who had reported the problem first also used custom serialization.
>
>
>
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