HeartSaVioR commented on PR #50626:
URL: https://github.com/apache/spark/pull/50626#issuecomment-2822830504

   See the head of the log;
   
   ```
   25/04/17 21:45:01.940 main DEBUG MutableMetricsFactory: field 
org.apache.hadoop.metrics2.lib.MutableRate 
org.apache.hadoop.security.UserGroupInformation$UgiMetrics.getGroups with 
annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, 
sampleName="Ops", valueName="Time", about="", interval=10, type=DEFAULT, 
value={"GetGroups"})
   25/04/17 21:45:01.951 main DEBUG MutableMetricsFactory: field 
org.apache.hadoop.metrics2.lib.MutableRate 
org.apache.hadoop.security.UserGroupInformation$UgiMetrics.loginFailure with 
annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, 
sampleName="Ops", valueName="Time", about="", interval=10, type=DEFAULT, 
value={"Rate of failed kerberos logins and latency (milliseconds)"})
   25/04/17 21:45:01.952 main DEBUG MutableMetricsFactory: field 
org.apache.hadoop.metrics2.lib.MutableRate 
org.apache.hadoop.security.UserGroupInformation$UgiMetrics.loginSuccess with 
annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, 
sampleName="Ops", valueName="Time", about="", interval=10, type=DEFAULT, 
value={"Rate of successful kerberos logins and latency (milliseconds)"})
   25/04/17 21:45:01.952 main DEBUG MutableMetricsFactory: field private 
org.apache.hadoop.metrics2.lib.MutableGaugeInt 
org.apache.hadoop.security.UserGroupInformation$UgiMetrics.renewalFailures with 
annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, 
sampleName="Ops", valueName="Time", about="", interval=10, type=DEFAULT, 
value={"Renewal failures since last successful login"})
   25/04/17 21:45:01.953 main DEBUG MutableMetricsFactory: field private 
org.apache.hadoop.metrics2.lib.MutableGaugeLong 
org.apache.hadoop.security.UserGroupInformation$UgiMetrics.renewalFailuresTotal 
with annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, 
sampleName="Ops", valueName="Time", about="", interval=10, type=DEFAULT, 
value={"Renewal failures since startup"})
   25/04/17 21:45:01.955 main DEBUG MetricsSystemImpl: UgiMetrics, User and 
group related metrics
   25/04/17 21:45:02.050 main DEBUG ShutdownHookManager: Adding shutdown hook
   25/04/17 21:45:02.079 main DEBUG Shell: Failed to detect a valid hadoop home 
directory
   java.io.FileNotFoundException: HADOOP_HOME and hadoop.home.dir are unset.
        at org.apache.hadoop.util.Shell.checkHadoopHomeInner(Shell.java:521)
        at org.apache.hadoop.util.Shell.checkHadoopHome(Shell.java:492)
        at org.apache.hadoop.util.Shell.<clinit>(Shell.java:569)
        at org.apache.hadoop.util.StringUtils.<clinit>(StringUtils.java:80)
        at 
org.apache.hadoop.conf.Configuration.getTimeDurationHelper(Configuration.java:1954)
        at 
org.apache.hadoop.conf.Configuration.getTimeDuration(Configuration.java:1912)
        at 
org.apache.hadoop.conf.Configuration.getTimeDuration(Configuration.java:1885)
        at 
org.apache.hadoop.util.ShutdownHookManager.getShutdownTimeout(ShutdownHookManager.java:183)
        at 
org.apache.hadoop.util.ShutdownHookManager$HookEntry.<init>(ShutdownHookManager.java:207)
   ```
   
   This starts with DEBUG log, before we get into the test. I think there was 
something we mess up with log4j conf (or JDK version or something helped us 
mess up).


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