![]() When required storage is greater than available memory, it stores some of the excess partitions into a disk and reads the data from the disk when required. In this Storage Level, The DataFrame will be stored in JVM memory as deserialized objects. NonReadableChannelException will be thrown if you request read on channel not open on read _AND_DISK is the default behavior of the DataFrame or Dataset. Map()method will throw NonWritableChannelException if it try to write on MapMode.READ_WRITE mode. ![]() MappedByteBuffer will also not be visible to other programs that have mapped the same file instead, they will cause private copies of the modified portions of the buffer to be created.
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