sanastas commented on issue #5698: Oak: New Concurrent Key-Value Map URL: https://github.com/apache/incubator-druid/issues/5698#issuecomment-499476854 While measuring the Oak performance we have found IncrementalIndex module doesn't scale well with multi-threading. We traced the threads’ blocking states to two causes: A monitor in IncrementalIndex that synchronized access to dimensionDescs A Read-Write lock in StringDimensionIndexer The first case is addressed in PR#7838. You are welcome to take a look. Thanks!
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