[ https://issues.apache.org/jira/browse/FLINK-5961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Till Rohrmann closed FLINK-5961. -------------------------------- Resolution: Won't Do Queryable state is currently no longer supported. > Queryable State is broken for HeapKeyedStateBackend > --------------------------------------------------- > > Key: FLINK-5961 > URL: https://issues.apache.org/jira/browse/FLINK-5961 > Project: Flink > Issue Type: Bug > Components: Runtime / Queryable State > Affects Versions: 1.2.0 > Reporter: Stefan Richter > Priority: Major > > The current implementation of queryable state on `HeapKeyedStateBackend` > attempts to handle concurrency by using `ConcurrentHashMap`s as datastructure. > However, the implementation has at least two issues: > 1) Concurrent modifications of state objects: state can be modified > concurrently to a query, e.g. an element being removed from a list. This can > result in exceptions or incorrect results. > 2) StateDescriptor is indicating whether a `ConcurrentHashMap` is required > because queryable state is active. On restore, this information is unknown at > first and the implementation always uses plain hash maps. When the state is > then finally registered, all previously existing maps are not thread-safe. -- This message was sent by Atlassian Jira (v8.3.4#803005)