[
https://issues.apache.org/jira/browse/FLINK-9034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16408517#comment-16408517
]
ASF GitHub Bot commented on FLINK-9034:
---------------------------------------
Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/5732#discussion_r176220974
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/state/StateDescriptor.java
---
@@ -77,18 +80,22 @@
/** The serializer for the type. May be eagerly initialized in the
constructor,
* or lazily once the type is serialized or an ExecutionConfig is
provided. */
+ @Nullable
protected TypeSerializer<T> serializer;
+ /** The type information describing the value type. Only used to lazily
create the serializer
--- End diff --
nit: I think this was also a copying error in the original comment, but
this is not necessarily a "value", unless we simply thing of all state as a
value, in which case I'm fine with this.
> State Descriptors drop TypeInformation on serialization
> -------------------------------------------------------
>
> Key: FLINK-9034
> URL: https://issues.apache.org/jira/browse/FLINK-9034
> Project: Flink
> Issue Type: Bug
> Components: State Backends, Checkpointing
> Affects Versions: 1.5.0, 1.4.2
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Priority: Major
> Fix For: 1.6.0
>
>
> The following code currently causes problems
> {code}
> public class MyFunction extends RichMapFunction<A, B> {
> private final ValueStateDescriptor<MyType> descr = new
> ValueStateDescriptor<>("state name", MyType.class);
> private ValueState<MyType> state;
> @Override
> public void open() {
> state = getRuntimeContext().getValueState(descr);
> }
> }
> {code}
> The problem is that the state descriptor drops the type information and
> creates a serializer before serialization as part of shipping the function in
> the cluster. To do that, it initializes the serializer with an empty
> execution config, making serialization inconsistent.
> This is mainly an artifact from the days when dropping the type information
> before shipping was necessary, because the type info was not serializable. It
> now is, and we can fix that bug.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
