gianm commented on issue #6690: bugfix: when building materialized-view, if taskCount>1, may cause concurrentModificationException URL: https://github.com/apache/incubator-druid/pull/6690#issuecomment-460822800 Or how about using `.remove()` on the iterator? I think if these maps are not actually going to be used from multiple threads, then we don't need to make them ConcurrentMaps.
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