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https://issues.apache.org/jira/browse/FLINK-5790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15865587#comment-15865587
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ASF GitHub Bot commented on FLINK-5790:
---------------------------------------
Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/3305#discussion_r101008561
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/typeutils/base/ArrayListSerializer.java
---
@@ -108,9 +112,13 @@ public void copy(DataInputView source, DataOutputView
target) throws IOException
@Override
public boolean equals(Object obj) {
+ if (obj.getClass() != getClass()) {
+ System.out.println("other " + obj.getClass().getName()
+ ", this " + getClass().getName());
--- End diff --
This is probably left over code that should be removed.
> Use list types when ListStateDescriptor extends StateDescriptor
> ---------------------------------------------------------------
>
> Key: FLINK-5790
> URL: https://issues.apache.org/jira/browse/FLINK-5790
> Project: Flink
> Issue Type: Improvement
> Reporter: Xiaogang Shi
> Assignee: Xiaogang Shi
>
> Flink keeps the state serializer in {{StateDescriptor}}, but it's the
> serializer of list elements that is put in {{ListStateDescriptor}}. The
> implementation is a little confusing. Some backends need to construct the
> state serializer with the element serializer by themselves.
> We should use an {{ArrayListSerializer}}, which is composed of the serializer
> of the element, in the {{ListStateDescriptor}}. It helps the backend to avoid
> constructing the state serializer.
> If a backend needs customized serialization of the state (e.g.
> {{RocksDBStateBackend}}), it still can obtain the element serializer from the
> {{ArrayListSerializer}}.
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