Thanks, the window operator is just:
.timeWindow(Time.seconds(10))
We haven't changed key types.
I tried debugging this issue in IDE and found the root cause to be this:
!this.keyDeserializer.equals(keySerializer) -> true
=> throw new IllegalStateException("Tried to initialize restored
TimerService with different serializers than those used to snapshot its
state.");
This is in HeapInternalTimerService#startTimerService.
With debugger I can see this:
keySerializer =
org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer@45f8043a
keyDeserializer
= org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer@45f8043a
namespaceDeserializer
=
org.apache.flink.streaming.api.windowing.windows.TimeWindow$Serializer@69d3cf7e
this.keySerializer = null
this.keyDeserializer
= org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer@e26116cd
this.namespaceDeserializer = null
Now, as the problamatic difference comes from comparison of
this.keyDeserializer & keySerializer, some further details on those:
this.keyDeserializer.type = java.lang.Object (java.lang.class@325)
keySerializer.type = java.lang.Object (java.lang.class@325)
I dug in deeper to KryoSerializer#equals, found this condition to be the
one that fails:
Objects.equals(this.kryoRegistrations, other.kryoRegistrations) -> false
Takes me down to KryoRegistration#equals:
this.registeredClass = class
org.apache.flink.api.java.typeutils.runtime.kryo.Serializers$DummyAvroRegisteredClass
other.registeredClass = class org.apache.avro.generic.GenericData$Array
this.serializerDefinitionType = INSTANCE
other.serializerDefinitionType = CLASS
this.serializerClass = null
other.serializerClass = class
org.apache.flink.api.java.typeutils.runtime.kryo.Serializers$DummyAvroKryoSerializerClass
Weird huh? I can't see how I would've changed anything related to these
when making those minor code changes required in upgrading to 1.4.
Cheers,
Juho
On Fri, Jan 12, 2018 at 2:58 PM, Tzu-Li (Gordon) Tai <tzuli...@apache.org>
wrote:
> Hi Juho,
>
> Could your key type have possibly changed / been modified across the
> upgrade?
> Also, from the error trace, it seems like the failing restore is of a
> window
> operator. What window type are you using?
>
> That exception is a result of either mismatching key serializers or
> namespace serializers (i.e. a window serializer), so the above info should
> help us narrow down the issue here.
>
> Cheers,
> Gordon
>
>
>
> --
> Sent from: http://apache-flink-user-mailing-list-archive.2336050.
> n4.nabble.com/
>
