xiangfu0 edited a comment on pull request #6424:
URL: https://github.com/apache/incubator-pinot/pull/6424#issuecomment-829473903
> > pardon my ignorance - why do we say that this change makes it
backward-incompatible?
>
> By backward incompatible do you mean that an older pinot cluster cannot be
upgraded?
> If so I would say this is not backward-incompatible: we were able to
upgrade a cluster in place with the same
> configuration.
>
> @xiangfu0 do you have some more context?
I think the issue is that JDK11 built binary cannot be ran using JDK8, which
requires all existing JDK8 users to upgrade their environment.
Here are the errors when you try to run JDK 11 built pinot with JDK 8
Runtime:
```
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError:
org/apache/pinot/tools/Quickstart has been compiled by a more recent version of
the Java Runtime (class file version 55.0), this version of the Java Runtime
only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:495)
```
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