steveloughran commented on PR #7882:
URL: https://github.com/apache/hadoop/pull/7882#issuecomment-3487855879
everything running mr job can't spawn process properly as the launched jvm
is always java8.
I've mostly fixed this but some of the spawned mr jobs still play up in
batch runs but not standalone
```
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError:
org/apache/hadoop/mapreduce/v2/app/MRAppMaster has been compiled by a more
recent version of the Java Runtime (class file version 61.0), this version of
the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
```
One regression is a JUnit5 regression; the configurable timeouts of scale
tests are no longer being picked up, slow tests are timing out
```
[ERROR]
org.apache.hadoop.fs.s3a.scale.ITestS3AConcurrentOps.testThreadPoolCoolDown --
Time elapsed: 183.3 s <<< ERROR!
java.util.concurrent.TimeoutException: testThreadPoolCoolDown() timed out
after 180 seconds
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
Suppressed: java.lang.InterruptedException: sleep interrupted
at java.base/java.lang.Thread.sleep(Native Method)
at
org.apache.hadoop.fs.s3a.scale.ITestS3AConcurrentOps.testThreadPoolCoolDown(ITestS3AConcurrentOps.java:218)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
... 2 more
```
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