Github user jlhitt commented on a diff in the pull request:
https://github.com/apache/spark/pull/14762#discussion_r78975107
--- Diff:
core/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java ---
@@ -699,9 +703,10 @@ public boolean append(Object kbase, long koff, int
klen, Object vbase, long voff
// the key address instead of storing the absolute address of the
value, the key and value
// must be stored in the same memory page.
// (8 byte key length) (key) (value) (8 byte pointer to next value)
- final long recordLength = 8 + klen + vlen + 8;
+ int uaoSize = UnsafeAlignedOffset.getUaoSize();
+ final long recordLength = (2 * uaoSize) + klen + vlen + 8;
--- End diff --
No, the "8" here has to do with extra padding introduced in 2.0. The first
"8" that was replaced by (2 * uaoSize) has to do with the alignment.
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