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https://issues.apache.org/jira/browse/FLINK-8365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16335752#comment-16335752
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ASF GitHub Bot commented on FLINK-8365:
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Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/5326
> Relax List type in HeapListState and HeapKeyedStateBackend
> ----------------------------------------------------------
>
> Key: FLINK-8365
> URL: https://issues.apache.org/jira/browse/FLINK-8365
> Project: Flink
> Issue Type: Improvement
> Components: State Backends, Checkpointing
> Affects Versions: 1.5.0
> Reporter: Bowen Li
> Assignee: Bowen Li
> Priority: Major
> Fix For: 1.5.0
>
>
> {{stateTable}} in HeapListState and
> {{HeapKeyedStateBackend#createListState()}} are both strongly typed to
> {{ArrayList}} right now.
> As discussed with [~StephanEwen] and [[email protected]] in
> https://github.com/apache/flink/pull/4963, we may want to relax the type to
> {{List}}.
> Problems discovered now:
> 1. That may require changing serializer from {{ArrayListSerializer}} to
> {{ListSerializer}} in the following code, and we need to discuss the pros and
> cons
> {code:java}
> @Override
> public <N, T> InternalListState<N, T> createListState(
> TypeSerializer<N> namespaceSerializer,
> ListStateDescriptor<T> stateDesc) throws Exception {
> // the list state does some manual mapping, because the state
> is typed to the generic
> // 'List' interface, but we want to use an implementation typed
> to ArrayList
> // using a more specialized implementation opens up runtime
> optimizations
> StateTable<K, N, ArrayList<T>> stateTable =
> tryRegisterStateTable(
> stateDesc.getName(),
> stateDesc.getType(),
> namespaceSerializer,
> new
> ArrayListSerializer<T>(stateDesc.getElementSerializer()));
> return new HeapListState<>(stateDesc, stateTable,
> keySerializer, namespaceSerializer);
> }
> {code}
> 2. for non-RocksDBStateBackend (AsyncFileStateBackendTest,
> AsyncMemoryStateBackendTest, FileStateBackendTest, and
> MemoryStateBackendTest), unit tests testListState and
> testListStateAddUpdateAndGet fail
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