slfan1989 commented on PR #4250:
URL: https://github.com/apache/hadoop/pull/4250#issuecomment-1114894552
When the PR was automatically checked, it was found that the test could not
pass, and the following error was reported in the local test.
```
Caused by: org.apache.hadoop.metrics2.MetricsException: Metrics source
DelegationTokenSecretManagerMetrics already exists!
at
org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newSourceName(DefaultMetricsSystem.java:152)
at
org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.sourceName(DefaultMetricsSystem.java:125)
at
org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:229)
at
org.apache.hadoop.metrics2.MetricsSystem.register(MetricsSystem.java:71)
at
org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager$DelegationTokenSecretManagerMetrics.create(AbstractDelegationTokenSecretManager.java:878)
at
org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager.<init>(AbstractDelegationTokenSecretManager.java:152)
at
org.apache.hadoop.security.token.delegation.web.DelegationTokenManager$DelegationTokenSecretManager.<init>(DelegationTokenManager.java:72)
at
org.apache.hadoop.security.token.delegation.web.DelegationTokenManager.<init>(DelegationTokenManager.java:122)
at
org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticationHandler.initTokenManager(DelegationTokenAuthenticationHandler.java:161)
at
org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticationHandler.init(DelegationTokenAuthenticationHandler.java:130)
at
org.apache.hadoop.security.authentication.server.AuthenticationFilter.initializeAuthHandler(AuthenticationFilter.java:194)
at
org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticationFilter.initializeAuthHandler(DelegationTokenAuthenticationFilter.java:214)
at
org.apache.hadoop.security.authentication.server.AuthenticationFilter.init(AuthenticationFilter.java:180)
at
org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticationFilter.init(DelegationTokenAuthenticationFilter.java:180)
at
org.apache.hadoop.yarn.server.security.http.RMAuthenticationFilter.init(RMAuthenticationFilter.java:53)
at
org.eclipse.jetty.servlet.FilterHolder.initialize(FilterHolder.java:140)
```
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