Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/17472#discussion_r108884076 --- Diff: common/unsafe/src/main/java/org/apache/spark/unsafe/Platform.java --- @@ -46,18 +46,22 @@ private static final boolean unaligned; static { boolean _unaligned; - // use reflection to access unaligned field - try { - Class<?> bitsClass = - Class.forName("java.nio.Bits", false, ClassLoader.getSystemClassLoader()); - Method unalignedMethod = bitsClass.getDeclaredMethod("unaligned"); - unalignedMethod.setAccessible(true); - _unaligned = Boolean.TRUE.equals(unalignedMethod.invoke(null)); - } catch (Throwable t) { - // We at least know x86 and x64 support unaligned access. - String arch = System.getProperty("os.arch", ""); - //noinspection DynamicRegexReplaceableByCompiledPattern - _unaligned = arch.matches("^(i[3-6]86|x86(_64)?|x64|amd64|aarch64)$"); + String arch = System.getProperty("os.arch", ""); + if (arch.matches("^(ppc64le | ppc64)$")) { --- End diff -- Sorry, I'm writing one thing and thinking another. I mean alignment, not endianness. Which architectures do you know allow unaligned access? I'd presume all PPC does, and I assume the JDK issue means "PPC64 (big-endian) but also PPC64 little-endian". OK, to be conservative, maybe just check the strings "ppc64" and "ppc64le" as you intended. However your regex doesn't work. You have extra whitespace. Just instead check `arch.equals(...) || arch.equals(...)` Also the PR title shoudl match the JIRA title. I was commenting that it differed here in referring to a flaky test, but it isn't. To be very clear, I propose you rename both to perhaps: "Workaround JDK-8165231 to identify PPC64 architectures as supporting unaligned access"
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