Github user srowen commented on a diff in the pull request:
    --- Diff: 
core/src/main/java/org/apache/spark/unsafe/map/ ---
    @@ -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 --
    Is the "8" here related to the alignment size and needs to be changed?

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