Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/18805
```
$ ldd linux/amd64/libzstd-jni.so
ldd: warning: you do not have execution permission for
`linux/amd64/libzstd-jni.so'
linux/amd64/libzstd-jni.so: /lib64/libc.so.6: version `GLIBC_2.14' not
found (required by linux/amd64/libzstd-jni.so)
linux-vdso.so.1 => (0x00007ffe0dfda000)
libc.so.6 => /lib64/libc.so.6 (0x00007f89eb3a4000)
/lib64/ld-linux-x86-64.so.2 (0x0000003612e00000)
```
Mystery solved; library is compiled with a newer glibc requirement than the
amplab machines have. Can we ask them to tweak their compilation to support
older Linux distros?
```
$ cat /etc/issue
CentOS release 6.9 (Final)
```
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