grighetto opened a new pull request #478: CASSANDRA-15526 Fix testConcurrentMemtableReadsAndWrites UT URL: https://github.com/apache/cassandra/pull/478 The implementation of ConcurrentSkipListMap changed significantly from Java v8 to v11. In v8, ConcurrentSkipListMap#size iterates over the elements in the map and counts them as it goes. But in v11, ConcurrentSkipListMap holds an internal LongAdder instance, which is incremented as new elements are added. In both versions, isEmpty will return false if it's able to find the head node. The issue is that in v11 there's a potential race condition in which the head node may have been initialized, but the LongAdder hasn't been incremented yet, which leaves it briefly in an inconsistent state. https://issues.apache.org/jira/browse/CASSANDRA-15526?focusedCommentId=17049522&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17049522
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