Github user sihuazhou commented on the issue: https://github.com/apache/flink/pull/5934 Hi @StefanRRichter sorry for the unclearly description here. What this PR trying to fix is the mainly relate to the below code which run async: ```java for (Map.Entry<String, StateTable<K, ?, ?>> kvState : stateTables.entrySet()) { // do something } // this will just close the outer compression stream ``` the `stateTables` may cause concurrency problem.
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