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https://issues.apache.org/jira/browse/FLINK-7475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16310433#comment-16310433
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ASF GitHub Bot commented on FLINK-7475:
---------------------------------------
Github user StefanRRichter commented on a diff in the pull request:
https://github.com/apache/flink/pull/4963#discussion_r159548273
--- Diff:
flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBListState.java
---
@@ -158,4 +158,28 @@ public void mergeNamespaces(N target, Collection<N>
sources) throws Exception {
throw new Exception("Error while merging state in
RocksDB", e);
}
}
+
+ @Override
+ public void update(List<V> values) throws Exception {
+ clear();
+
+ if (values != null && !values.isEmpty()) {
--- End diff --
What I meant, is not a RocksDB question, but a question if the list state
should return `null` or empty iterator if after the user stored an empty list
under a key. That might make a difference and right now, I the caller updates
with empty list, the get is identical to a non-existing mapping (`null`).
> support update() in ListState
> -----------------------------
>
> Key: FLINK-7475
> URL: https://issues.apache.org/jira/browse/FLINK-7475
> Project: Flink
> Issue Type: Improvement
> Components: Core, DataStream API, State Backends, Checkpointing
> Affects Versions: 1.4.0
> Reporter: yf
> Assignee: Bowen Li
> Fix For: 1.5.0
>
>
> If I want to update the list.
> I have to do two steps:
> listState.clear()
> for (Element e : myList) {
> listState.add(e);
> }
> Why not I update the state by:
> listState.update(myList) ?
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