ly923976094 commented on issue #3454: what is the difference between mmap and heap? URL: https://github.com/apache/incubator-pinot/issues/3454#issuecomment-463951428 > I assume you are referring to segment loadMode configuration. "HEAP" is an unfortunate wrong description, but it refers to directly allocated memory (so, it is off-heap). All the bytes of a segment are copied into bufers allocated via ByteBuffer.allocateDirect(). > > MMAP mode means the segment file is mapped into memory. > > See the class PinotByteBuffer Which loading mode should be used for real-time and offline tables @mcvsubbu
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