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From: Shai Kaplan <Shai.Kaplan@microsoft.com>
To: "user@flink.apache.org" <user@flink.apache.org>
Subject: KryoException: Encountered unregistered class ID
Thread-Topic: KryoException: Encountered unregistered class ID
Thread-Index: AdLdJwVAjx+rTOZWQTu1+KdkrMGvyQ==
Date: Sun, 4 Jun 2017 11:56:43 +0000
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Hi.
I'm running a job from a savepoint. I've changed one of the classes stored =
in state. When I try to load the value from the state I get "com.esotericso=
ftware.kryo.KryoException: Encountered unregistered class ID: 97".
I tried to understand if the problem arise from the nature of the change, o=
r simply because there was a change in the class, so I changed the class so=
 that the only difference from the previous version is a new boolean field,=
 and the problem still occur (the ID number changes when I change the class=
). If I revert the class back to its old version, everything is fine.

I'm not sure if the class ID that I'm seeing is the right one, or is it jus=
t some random number received from reading the wrong place in the serialize=
d object, or something like that. When I change the boolean to String the n=
umber in the exception changes to 41188...

What should I do to be able to restore from the state a class that now has =
a new field? Should I manually register the class? With what ID?

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<p class=3D"MsoNormal" style=3D"text-align:left;direction:ltr;unicode-bidi:=
embed">Hi.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"text-align:left;direction:ltr;unicode-bidi:=
embed">I'm running a job from a savepoint. I've changed one of the classes =
stored in state. When I try to load the value from the state I get &quot;co=
m.esotericsoftware.kryo.KryoException: Encountered
 unregistered class ID: 97&quot;.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"text-align:left;direction:ltr;unicode-bidi:=
embed">I tried to understand if the problem arise from the nature of the ch=
ange, or simply because there was a change in the class, so I changed the c=
lass so that the only difference from
 the previous version is a new boolean field, and the problem still occur (=
the ID number changes when I change the class). If I revert the class back =
to its old version, everything is fine.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"text-align:left;direction:ltr;unicode-bidi:=
embed"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"text-align:left;direction:ltr;unicode-bidi:=
embed">I'm not sure if the class ID that I'm seeing is the right one, or is=
 it just some random number received from reading the wrong place in the se=
rialized object, or something like that.
 When I change the boolean to String the number in the exception changes to=
 41188&#8230;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"text-align:left;direction:ltr;unicode-bidi:=
embed"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"text-align:left;direction:ltr;unicode-bidi:=
embed">What should I do to be able to restore from the state a class that n=
ow has a new field? Should I manually register the class? With what ID?<o:p=
></o:p></p>
</div>
</body>
</html>

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