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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