Github user tejasapatil commented on a diff in the pull request: https://github.com/apache/spark/pull/19222#discussion_r144457126 --- Diff: common/unsafe/src/main/java/org/apache/spark/unsafe/memory/MemoryBlock.java --- @@ -17,47 +17,168 @@ package org.apache.spark.unsafe.memory; -import javax.annotation.Nullable; - import org.apache.spark.unsafe.Platform; +import javax.annotation.Nullable; + /** - * A consecutive block of memory, starting at a {@link MemoryLocation} with a fixed size. + * A declaration of interfaces of MemoryBlock classes . */ -public class MemoryBlock extends MemoryLocation { +public abstract class MemoryBlock { + @Nullable + protected final Object obj; - private final long length; + protected final long offset; + + protected final long length; /** * Optional page number; used when this MemoryBlock represents a page allocated by a - * TaskMemoryManager. This field is public so that it can be modified by the TaskMemoryManager, - * which lives in a different package. + * TaskMemoryManager. This field can be updated using setPageNumber method so that --- End diff -- I think keeping it public would be more performant VS mutating the field using a method. I know that this using method is better way in terms of design but there are places in codebase where we do this for solely for perf. reasons
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