Merge pull request #342 from qiaozhanwei/branch-1.0.2

 master startup lock dev

escheduler-common/src/main/java/cn/escheduler/common/Constants.java

@@ -162,6 +162,11 @@ public final class Constants {
      */
     public static final String ZOOKEEPER_ESCHEDULER_LOCK_FAILOVER_WORKERS = "zookeeper.escheduler.lock.failover.workers";
 
+    /**
+     * MasterServer startup  failover runing and fault tolerance process
+     */
+    public static final String ZOOKEEPER_ESCHEDULER_LOCK_FAILOVER_STARTUP_MASTERS = "zookeeper.escheduler.lock.failover.startup.masters";
+
     /**
      * need send warn times when master server or worker server failover
      */

escheduler-common/src/main/resources/zookeeper.properties

@@ -16,6 +16,7 @@ zookeeper.escheduler.lock.workers=/escheduler/lock/workers
 #escheduler failover directory
 zookeeper.escheduler.lock.failover.masters=/escheduler/lock/failover/masters
 zookeeper.escheduler.lock.failover.workers=/escheduler/lock/failover/workers
+zookeeper.escheduler.lock.failover.startup.masters=/escheduler/lock/failover/startup-masters
 
 #escheduler failover directory
 zookeeper.session.timeout=300

escheduler-server/src/main/java/cn/escheduler/server/zk/ZKMasterClient.java

@@ -31,6 +31,7 @@ import cn.escheduler.dao.model.TaskInstance;
 import cn.escheduler.server.ResInfo;
 import cn.escheduler.server.utils.ProcessUtils;
 import org.apache.curator.framework.CuratorFramework;
+import org.apache.curator.framework.imps.CuratorFrameworkState;
 import org.apache.curator.framework.recipes.cache.PathChildrenCache;
 import org.apache.curator.framework.recipes.cache.PathChildrenCacheEvent;
 import org.apache.curator.framework.recipes.cache.PathChildrenCacheListener;
@@ -111,21 +112,46 @@ public class ZKMasterClient extends AbstractZKClient {
 		// init dao
 		this.initDao();
 
-		// init system znode
-		this.initSystemZNode();
+		InterProcessMutex mutex = null;
+		try {
+			// create distributed lock with the root node path of the lock space as /escheduler/lock/failover/master
+			String znodeLock = getMasterStartUpLockPath();
+
+			mutex = new InterProcessMutex(zkClient, znodeLock);
+			mutex.acquire();
+
+			// init system znode
+			this.initSystemZNode();
+
+			// monitor master
+			this.listenerMaster();
 
-		// monitor master
-		this.listenerMaster();
+			// monitor worker
+			this.listenerWorker();
 
-		// monitor worker
-		this.listenerWorker();
+			// register master
+			this.registMaster();
 
-		// register master
-		this.registMaster();
+			// check if fault tolerance is required，failure and tolerance
+			if (getActiveMasterNum() == 1) {
+				processDao.selfFaultTolerant(ExecutionStatus.RUNNING_EXEUTION.ordinal(),ExecutionStatus.NEED_FAULT_TOLERANCE.ordinal());
+			}
+
+		}catch (Exception e){
+			logger.error("master start up  exception : " + e.getMessage(),e);
+		}finally {
+			if (mutex != null){
+				try {
+					mutex.release();
+				} catch (Exception e) {
+					if(e.getMessage().equals("instance must be started before calling this method")){
+						logger.warn("lock release");
+					}else{
+						logger.error("lock release failed : " + e.getMessage(),e);
+					}
 
-		// check if fault tolerance is required，failure and tolerance
-		if (getActiveMasterNum() == 1) {
-			processDao.selfFaultTolerant(ExecutionStatus.RUNNING_EXEUTION.ordinal(),ExecutionStatus.NEED_FAULT_TOLERANCE.ordinal());
+				}
+			}
 		}
 	}
 
@@ -417,6 +443,14 @@ public class ZKMasterClient extends AbstractZKClient {
 		return conf.getString(Constants.ZOOKEEPER_ESCHEDULER_LOCK_MASTERS);
 	}
 
+	/**
+	 *  get master start up lock path
+	 * @return
+	 */
+	public String getMasterStartUpLockPath(){
+		return conf.getString(Constants.ZOOKEEPER_ESCHEDULER_LOCK_FAILOVER_STARTUP_MASTERS);
+	}
+
 	/**
 	 *  get master failover lock path
 	 * @return