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https://issues.apache.org/jira/browse/HADOOP-18222?focusedWorklogId=766883&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-766883
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ASF GitHub Bot logged work on HADOOP-18222:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 05/May/22 19:43
Start Date: 05/May/22 19:43
Worklog Time Spent: 10m
Work Description: hchaverri opened a new pull request, #4266:
URL: https://github.com/apache/hadoop/pull/4266
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### Description of PR
### How was this patch tested?
### For code changes:
- [ ] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
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Issue Time Tracking
-------------------
Worklog Id: (was: 766883)
Remaining Estimate: 0h
Time Spent: 10m
> Prevent DelegationTokenSecretManagerMetrics from registering multiple times
> ----------------------------------------------------------------------------
>
> Key: HADOOP-18222
> URL: https://issues.apache.org/jira/browse/HADOOP-18222
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Hector Sandoval Chaverri
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> After committing HADOOP-18167, we received reports of the following error
> when ResourceManager is initialized:
> {noformat}
> Caused by: java.io.IOException: Problem starting http server
> at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:1389)
> at
> org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:475)
> ... 4 more
> Caused by: org.apache.hadoop.metrics2.MetricsException: Metrics source
> DelegationTokenSecretManagerMetrics already exists!
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.newSourceName(DefaultMetricsSystem.java:152)
> at
> org.apache.hadoop.metrics2.lib.DefaultMetricsSystem.sourceName(DefaultMetricsSystem.java:125)
> at
> org.apache.hadoop.metrics2.impl.MetricsSystemImpl.register(MetricsSystemImpl.java:229)
> at
> org.apache.hadoop.metrics2.MetricsSystem.register(MetricsSystem.java:71)
> at
> org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager$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){noformat}
> This can happen if MetricsSystemImpl#init is called and multiple metrics are
> registered with the same name. A proposed solution is to declare the metrics
> in AbstractDelegationTokenSecretManager as singleton, which would prevent
> multiple instances DelegationTokenSecretManagerMetrics from being registered.
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