ulysses-you commented on pull request #35078:
URL: https://github.com/apache/spark/pull/35078#issuecomment-1004836110
thank you @Yikun , I try to check the unaligned with armv7 using follow
command and it works as expected:
```shell
root@5d25e6cb0f3e:/# uname -a
Linux 5d25e6cb0f3e 5.10.76-linuxkit #1 SMP Mon Nov 8 10:21:19 UTC 2021
armv7l GNU/Linux
root@5d25e6cb0f3e:/# jshell
Jan 04, 2022 1:50:10 PM java.util.prefs.FileSystemPreferences$1 run
INFO: Created user preferences directory.
| Welcome to JShell -- Version 11.0.1
| For an introduction type: /help intro
jshell> System.getProperty("os.arch", "");
$1 ==> "arm"
jshell>
jshell> import java.lang.reflect.Field;
jshell>
jshell> Class<?> bitsClass = Class.forName("java.nio.Bits", false,
ClassLoader.getSystemClassLoader());
bitsClass ==> class java.nio.Bits
jshell> Field unalignedField = bitsClass.getDeclaredField("UNALIGNED");
unalignedField ==> private static boolean java.nio.Bits.UNALIGNED
jshell> unalignedField.setAccessible(true);
jshell> unalignedField.getBoolean(null);
$6 ==> false
```
It seems no easy way to check with armv5. But I think it should return
something like `arm` or `arm32` which is also aligned. Do you have any thought
? @srowen
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