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@@ -0,0 +1,74 @@
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+/**
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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * or more contributor license agreements. See the NOTICE file
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+ * distributed with this work for additional information
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+ * regarding copyright ownership. The ASF licenses this file
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+ * to you under the Apache License, Version 2.0 (the
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+ * "License"); you may not use this file except in compliance
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+ * with the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package org.apache.hadoop.yarn.server.resourcemanager;
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+
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+import org.apache.commons.logging.Log;
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+import org.apache.commons.logging.LogFactory;
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+import org.apache.hadoop.classification.InterfaceAudience;
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+import org.apache.hadoop.conf.Configuration;
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+import org.apache.hadoop.util.ZKUtil;
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+import org.apache.hadoop.yarn.conf.YarnConfiguration;
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+import org.apache.zookeeper.data.ACL;
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+
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+import java.util.Collections;
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+import java.util.List;
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+
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+/**
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+ * Helper class that provides utility methods specific to ZK operations
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+ */
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+@InterfaceAudience.Private
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+public class RMZKUtils {
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+ private static final Log LOG = LogFactory.getLog(RMZKUtils.class);
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+
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+ /**
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+ * Utility method to fetch the ZK ACLs from the configuration
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+ */
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+ public static List<ACL> getZKAcls(Configuration conf) throws Exception {
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+ // Parse authentication from configuration.
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+ String zkAclConf =
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+ conf.get(YarnConfiguration.RM_ZK_ACL,
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+ YarnConfiguration.DEFAULT_RM_ZK_ACL);
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+ try {
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+ zkAclConf = ZKUtil.resolveConfIndirection(zkAclConf);
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+ return ZKUtil.parseACLs(zkAclConf);
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+ } catch (Exception e) {
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+ LOG.error("Couldn't read ACLs based on " + YarnConfiguration.RM_ZK_ACL);
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+ throw e;
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+ }
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+ }
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+
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+ /**
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+ * Utility method to fetch ZK auth info from the configuration
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+ */
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+ public static List<ZKUtil.ZKAuthInfo> getZKAuths(Configuration conf)
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+ throws Exception {
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+ String zkAuthConf = conf.get(YarnConfiguration.RM_ZK_AUTH);
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+ try {
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+ zkAuthConf = ZKUtil.resolveConfIndirection(zkAuthConf);
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+ if (zkAuthConf != null) {
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+ return ZKUtil.parseAuth(zkAuthConf);
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+ } else {
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+ return Collections.emptyList();
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+ }
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+ } catch (Exception e) {
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+ LOG.error("Couldn't read Auth based on " + YarnConfiguration.RM_ZK_AUTH);
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+ throw e;
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+ }
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+ }
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+}
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Karthik Kambatla