StefanRRichter commented on a change in pull request #8611:
[FLINK-12693][state] Store state per key-group in CopyOnWriteStateTable
URL: https://github.com/apache/flink/pull/8611#discussion_r293560863
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/state/heap/StateTable.java
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@@ -172,14 +232,133 @@ public boolean isEmpty() {
* @return the state of the mapping with the specified key/namespace
composite key, or {@code null}
* if no mapping for the specified key is found.
*/
- public abstract S get(K key, N namespace);
+ public S get(K key, N namespace) {
+ int keyGroup = KeyGroupRangeAssignment.assignToKeyGroup(key,
keyContext.getNumberOfKeyGroups());
+ return get(key, keyGroup, namespace);
+ }
+
+ public Stream<K> getKeys(N namespace) {
+ return Arrays.stream(state)
+ .filter(Objects::nonNull)
+ .map(StateMap::iterator)
+ .flatMap(iter ->
StreamSupport.stream(Spliterators.spliteratorUnknownSize(iter, 0), false))
Review comment:
I think if you flatmap directly from the StateMap, you could get the size of
the spliterator instead of using `spliteratorUnknownSize` ?
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