sanastas edited a comment on issue #5698: Oak: New Concurrent Key-Value Map URL: https://github.com/apache/incubator-druid/issues/5698#issuecomment-513532033 Hi again, Just to prove what I have said about memory usage in numbers, hereby please find the graph presenting the measurements of memory usage of OakIncrementalIndex vs existing IncrementalIndex. The experiment presents memory usage measured for an invocation of IncrementalIngestionBenchmark. The horizontal axis presents the number of rows used in each experiment. The vertical axis presents GBs. Black dashed line present only data size - just keys and values (IndexRow and Aggregators). Blue line presents the total memory consumption for OakIncrementalIndex (both off-heap and on-heap). Red line presents the total memory consumption for Druid's current IncrementalIndex (just on-heap). One can see that IncrementalIndex metadata takes almost twice than OakIncrementalIndex's metadata. In total OakIncrementalIndex use less memory than IncrementalIndex. [Memory Usage (Metadata vs Data).pdf](https://github.com/apache/incubator-druid/files/3430367/Memory.Usage.Metadata.vs.Data.pdf)
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