dongjoon-hyun commented on a change in pull request #24825: [SPARK-27981][CORE]
Remove `Illegal reflective access` warning for `java.nio.Bits.unaligned()`
URL: https://github.com/apache/spark/pull/24825#discussion_r291796365
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File path: common/unsafe/src/main/java/org/apache/spark/unsafe/Platform.java
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@@ -319,4 +301,36 @@ public static void throwException(Throwable t) {
DOUBLE_ARRAY_OFFSET = 0;
}
}
+
+ // This requires `majorVersion` and `_UNSAFE`.
+ static {
+ boolean _unaligned;
+ String arch = System.getProperty("os.arch", "");
+ if (arch.equals("ppc64le") || arch.equals("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());
+ if (_UNSAFE != null && 9 <= majorVersion && majorVersion <= 12) {
+ // Java 9/10 and 11/12 have different field names.
+ Field unalignedField =
+ bitsClass.getDeclaredField(majorVersion >= 11 ? "UNALIGNED" :
"unaligned");
+ _unaligned = _UNSAFE.getBoolean(
+ _UNSAFE.staticFieldBase(unalignedField),
_UNSAFE.staticFieldOffset(unalignedField));
Review comment:
Only above 5 lines are new content.
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