Github user michaelkamprath commented on a diff in the pull request: https://github.com/apache/spark/pull/16403#discussion_r94049706 --- 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 -- fixed
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