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https://issues.apache.org/jira/browse/FLINK-6869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16046533#comment-16046533
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ASF GitHub Bot commented on FLINK-6869:
---------------------------------------
Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/4090#discussion_r121384869
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/typeutils/TypeSerializerSerializationUtil.java
---
@@ -362,8 +407,14 @@ public void read(DataInputView in) throws IOException {
int serializerBytes = in.readInt();
byte[] buffer = new byte[serializerBytes];
in.readFully(buffer);
- try {
- typeSerializer =
InstantiationUtil.deserializeObject(buffer, userClassLoader);
+
+ ClassLoader old =
Thread.currentThread().getContextClassLoader();
--- End diff --
Maybe rename to `previousClassLoader`
> Scala serializers do not have the serialVersionUID specified
> ------------------------------------------------------------
>
> Key: FLINK-6869
> URL: https://issues.apache.org/jira/browse/FLINK-6869
> Project: Flink
> Issue Type: Bug
> Components: Scala API, Type Serialization System
> Affects Versions: 1.3.0
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Blocker
> Labels: flink-rel-1.3.1-blockers
> Fix For: 1.3.1
>
>
> Currently, all Scala serializers, e.g. {{OptionSerializer}},
> {{CaseClassSerializer}}, {{TrySerializer}} etc. do not have the
> serialVersionUID specified.
> In 1.3, the Scala serializer (all serializers in general) implementations had
> to be changed since implementation of the compatibility methods
> {{snapshotConfiguration}}, {{ensureCompatibility}} had to be implemented,
> resulting in a new serialVersionUID.
> This means that when restoring from a snapshot pre-1.3 that contains Scala
> types as state, the previous serializer in the snapshot cannot be
> deserialized (due to UID mismatch).
> To fix this, we should specify the serialVersionUIDs of the Scala serializers
> to be what they originally were pre-1.3. This would then allow users with
> Scala types as state to restore from older versions.
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