mcvsubbu commented on issue #3978: The segments are stored in memory URL: https://github.com/apache/incubator-pinot/issues/3978#issuecomment-475268337 You do not need to disable and re-enable table for doing this. You can change the table config from HEAP to MMAP and either reload all segments of the table or one segment at a time. Doing it one segment at a time is better in production scenarios since the servers need to keep both versions of the segment loaded and swap the reference while serving live traffic. You can write a script to get the segments of the table and reload each one of them
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