Suma Shivaprasad created HADOOP-15411:
-----------------------------------------

             Summary: AuthenticationFilter should use 
Configuration.getPropsWithPrefix instead of iterator
                 Key: HADOOP-15411
                 URL: https://issues.apache.org/jira/browse/HADOOP-15411
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Suma Shivaprasad


Node manager start up fails with the following stack trace

{code}
2018-04-19 13:08:30,638 ERROR nodemanager.NodeManager 
(NodeManager.java:initAndStartNodeManager(921)) - Error starting NodeManager
org.apache.hadoop.yarn.exceptions.YarnRuntimeException: NMWebapps failed to 
start.
 at 
org.apache.hadoop.yarn.server.nodemanager.webapp.WebServer.serviceStart(WebServer.java:117)
 at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
 at 
org.apache.hadoop.service.CompositeService.serviceStart(CompositeService.java:121)
 at org.apache.hadoop.service.AbstractService.start(AbstractService.java:194)
 at 
org.apache.hadoop.yarn.server.nodemanager.NodeManager.initAndStartNodeManager(NodeManager.java:919)
 at 
org.apache.hadoop.yarn.server.nodemanager.NodeManager.main(NodeManager.java:979)
Caused by: org.apache.hadoop.yarn.webapp.WebAppException: Error starting http 
server
 at org.apache.hadoop.yarn.webapp.WebApps$Builder.build(WebApps.java:377)
 at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:424)
 at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:420)
 at 
org.apache.hadoop.yarn.server.nodemanager.webapp.WebServer.serviceStart(WebServer.java:112)
 ... 5 more
Caused by: java.io.IOException: java.util.ConcurrentModificationException
 at org.apache.hadoop.http.HttpServer2.<init>(HttpServer2.java:532)
 at org.apache.hadoop.http.HttpServer2.<init>(HttpServer2.java:117)
 at org.apache.hadoop.http.HttpServer2$Builder.build(HttpServer2.java:421)
 at org.apache.hadoop.yarn.webapp.WebApps$Builder.build(WebApps.java:333)
 ... 8 more
Caused by: java.util.ConcurrentModificationException
 at java.util.Hashtable$Enumerator.next(Hashtable.java:1383)
 at org.apache.hadoop.conf.Configuration.iterator(Configuration.java:2853)
 at 
org.apache.hadoop.security.AuthenticationFilterInitializer.getFilterConfigMap(AuthenticationFilterInitializer.java:73)
 at org.apache.hadoop.http.HttpServer2.getFilterProperties(HttpServer2.java:647)
 at 
org.apache.hadoop.http.HttpServer2.constructSecretProvider(HttpServer2.java:637)
 at org.apache.hadoop.http.HttpServer2.<init>(HttpServer2.java:525)
 ... 11 more
2018-04-19 13:08:30,639 INFO timeline.HadoopTimelineMetricsSink 
(AbstractTimelineMetricsSink.java:getCurrentCollectorHost(291)) - No live 
collector to send metrics to. Metrics to be sent will be discarded. This 
message will be skipped for the next 20 times.
{code}



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