Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/6306#discussion_r201944060
--- Diff: flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeyedStateBackend.java
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@@ -1666,6 +1667,7 @@ public void close() {
this.keyGroupPrefixBytes = Preconditions.checkNotNull(keyGroupPrefixBytes);
this.namespaceBytes = Preconditions.checkNotNull(namespaceBytes);
this.nextKey = null;
+ this.preKey = null;
--- End diff --
Maybe call this `previousKey`, just to be more clear.
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