Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16403#discussion_r94012502
--- Diff:
common/unsafe/src/test/java/org/apache/spark/unsafe/PlatformUtilSuite.java ---
@@ -74,4 +76,71 @@ public void memoryDebugFillEnabledInTest() {
Platform.getByte(offheap.getBaseObject(), offheap.getBaseOffset()),
MemoryAllocator.MEMORY_DEBUG_FILL_CLEAN_VALUE);
}
+
+ /**
+ * This test ensures that double access is handled correctly for the
host platform.
+ * On platforms that require double access to be aligned to 8-byte
boundaries, this
+ * test should pass and not cause the JVM to segfault.
+ */
+ @Test
+ public void unalignedDoublePutAndGet() {
+ MemoryBlock testBuffer = MemoryBlock.fromLongArray(new long[20]);
+
+ // write a double to an unaligned location
+ long unalignedOffset = testBuffer.getBaseOffset() + 3;
+ // double check unalignment just to be sure:
+ if (unalignedOffset%8 == 0) {
--- End diff --
Space around operators like %
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