mcvsubbu commented on issue #3978: The segments are stored in memory URL: https://github.com/apache/incubator-pinot/issues/3978#issuecomment-474932084 You can read up on MMAP here : https://en.wikipedia.org/wiki/Memory-mapped_file A segment is MMAPed as long as the server is alive and hosts the segment. If the server is restarted, it is mmaped again. If you want to change the load mode of segments, you can update the table config with the new load mode (MMAP), and use the controller console to reload the segment (or all segments of a table). If you do this, the direct-allocated memory will be released and the segment will now be loaded in MMAP mode. Hope this helps.
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