Github user kiszk commented on a diff in the pull request: https://github.com/apache/spark/pull/17472#discussion_r108837689 --- 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)$"); + if (arch.matches("^(ppc64le | ppc64)$")) { + // Since java.nio.Bits.unaligned() doesn't return true on ppc (See JDK-8165231), but ppc64 and ppc64le support it + _unaligned = true; + } else { + 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", ""); --- End diff -- Should we define `arch` before the `if` statement, now?
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