HADOOP-13255. KMSClientProvider should check and renew tgt when doing delegation token operations. Contributed by Xiao Chen.

(cherry picked from commit ddf66427ff92a3886f94954e21d59e998412059b)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/DelegationTokenAuthenticator.java

@@ -20,6 +20,7 @@ package org.apache.hadoop.security.token.delegation.web;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.security.SecurityUtil;
+import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.authentication.client.AuthenticatedURL;
 import org.apache.hadoop.security.authentication.client.AuthenticationException;
 import org.apache.hadoop.security.authentication.client.Authenticator;
@@ -124,6 +125,8 @@ public abstract class DelegationTokenAuthenticator implements Authenticator {
   public void authenticate(URL url, AuthenticatedURL.Token token)
       throws IOException, AuthenticationException {
     if (!hasDelegationToken(url, token)) {
+      // check and renew TGT to handle potential expiration
+      UserGroupInformation.getCurrentUser().checkTGTAndReloginFromKeytab();
       authenticator.authenticate(url, token);
     }
   }

hadoop-common-project/hadoop-kms/src/test/resources/log4j.properties

@@ -22,7 +22,7 @@ log4j.appender.stdout.Target=System.out
 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
 log4j.appender.stdout.layout.ConversionPattern=%d{ISO8601} %-5p %c{1} - %m%n
 
-log4j.rootLogger=WARN, stdout
+log4j.rootLogger=INFO, stdout
 log4j.logger.org.apache.hadoop.conf=ERROR
 log4j.logger.org.apache.hadoop.crytpo.key.kms.server=ALL
 log4j.logger.com.sun.jersey.server.wadl.generators.WadlGeneratorJAXBGrammarGenerator=OFF