YARN-6534. ResourceManager failed due to TimelineClient try to init SSLFactory even https is not enabled. Contributed by Rohith Sharma K S.

(cherry picked from commit 09e36ff59c05b8bd54d346d1103de0a7300875c6)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/client/api/impl/TimelineConnector.java

@@ -103,8 +103,13 @@ public class TimelineConnector extends AbstractService {
     ClientConfig cc = new DefaultClientConfig();
     cc.getClasses().add(YarnJacksonJaxbJsonProvider.class);
 
-    sslFactory = getSSLFactory(conf);
-    connConfigurator = getConnConfigurator(sslFactory);
+    if (YarnConfiguration.useHttps(conf)) {
+      // If https is chosen, configures SSL client.
+      sslFactory = getSSLFactory(conf);
+      connConfigurator = getConnConfigurator(sslFactory);
+    } else {
+      connConfigurator = DEFAULT_TIMEOUT_CONN_CONFIGURATOR;
+    }
 
     if (UserGroupInformation.isSecurityEnabled()) {
       authenticator = new KerberosDelegationTokenAuthenticator();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/client/api/impl/TestTimelineClient.java

@@ -34,6 +34,7 @@ import java.security.PrivilegedExceptionAction;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
+import org.apache.hadoop.http.HttpConfig.Policy;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.ssl.KeyStoreTestUtil;
@@ -451,6 +452,7 @@ public class TestTimelineClient {
     YarnConfiguration conf = new YarnConfiguration();
     conf.setBoolean(YarnConfiguration.TIMELINE_SERVICE_ENABLED, true);
     conf.setInt(YarnConfiguration.TIMELINE_SERVICE_CLIENT_MAX_RETRIES, 0);
+    conf.set(YarnConfiguration.YARN_HTTP_POLICY_KEY, Policy.HTTPS_ONLY.name());
 
     File testDir = TestGenericTestUtils.getTestDir();
     String sslConfDir =