An error occurred while accessing the blue whale task after alimama open source mdrill is started: caused by: org. Apache. zookeeper. keeperexception $ connectionlossexception: keeperrorcode = connectionloss

After startup, access the: http: // ip: 1107/mdrill. jsp blue whale task

The following error occurs on the http:/IP: 1107/topology. jsp page:

HTTP ERROR 500Problem accessing /topology.jsp. Reason:    KeeperErrorCode = ConnectionLossCaused by:org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss    at com.netflix.curator.ConnectionState.getZooKeeper(ConnectionState.java:72)    at com.netflix.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:74)    at com.netflix.curator.framework.imps.CuratorFrameworkImpl.getZooKeeper(CuratorFrameworkImpl.java:381)    at com.netflix.curator.framework.imps.ExistsBuilderImpl$2.call(ExistsBuilderImpl.java:149)    at com.netflix.curator.framework.imps.ExistsBuilderImpl$2.call(ExistsBuilderImpl.java:138)    at com.netflix.curator.RetryLoop.callWithRetry(RetryLoop.java:85)    at com.netflix.curator.framework.imps.ExistsBuilderImpl.pathInForeground(ExistsBuilderImpl.java:134)    at com.netflix.curator.framework.imps.ExistsBuilderImpl.forPath(ExistsBuilderImpl.java:125)    at com.netflix.curator.framework.imps.ExistsBuilderImpl.forPath(ExistsBuilderImpl.java:34)    at com.alipay.bluewhale.core.zk.Zookeeper.existsNode(Zookeeper.java:108)    at com.alipay.bluewhale.core.zk.Zookeeper.mkdirs(Zookeeper.java:127)    at com.alipay.bluewhale.core.cluster.DistributedClusterState.<init>(DistributedClusterState.java:40)    at com.alipay.bluewhale.core.cluster.Cluster.mk_distributed_cluster_state(Cluster.java:119)    at com.alimama.mdrill.partion.GetShards.getCluster(GetShards.java:196)    at com.alimama.web.Topology.active_storms(Topology.java:19)    at org.apache.jsp.topology_jsp._jspService(org.apache.jsp.topology_jsp:57)    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:109)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:389)    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:486)    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:380)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)    at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)    at org.mortbay.jetty.Server.handle(Server.java:326)    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)    at java.lang.Thread.run(Thread.java:744)

Solution: Disable the centos firewall.