Hello igniters! So I was working on a fix for https://issues.apache.org/jira/browse/IGNITE-9056 The reason for test flakiness turned out our ConcurrentLinkedHashMap (and its tautological cousin GridBoundedConcurrentLinkedHashMap) is broken :(
When you do clear(). its size counter is not updated. So sizex() will return the old size after clear, and if there's maxCnt set, after several clear()s it will immediately evict entries after they are inserted, maintaining map size at 0. This is scary since indexing internals make intense use of ConcurrentLinkedHashMaps. My suggestion for this fix is to avoid ever calling clear(), making it throw UnsupportedOperationException and recreating/replacing map instead of clear()ing it. Unless somebody is going to stand up and fix ConcurrentLinkedHashMap.clear() properly. Frankly speaking I'm afraid of touching this code in any non-trivial way. -- Ilya Kasnacheev
