[에러] Failure in connecting to Drill: org.apache.drill.exec.rpc.RpcException: Failure setting up ZK for client

* 아래와 같은 에러 발생 시

08:38:00.352 [main] ERROR o.a.c.f.imps.CuratorFrameworkImpl - Background exception was not retry-able or retry gave up
java.net.UnknownHostException:  secondary: Temporary failure in name resolution
        at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method) ~[na:1.8.0_144]
        at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928) ~[na:1.8.0_144]
        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323) ~[na:1.8.0_144]
        at java.net.InetAddress.getAllByName0(InetAddress.java:1276) ~[na:1.8.0_144]
        at java.net.InetAddress.getAllByName(InetAddress.java:1192) ~[na:1.8.0_144]
        at java.net.InetAddress.getAllByName(InetAddress.java:1126) ~[na:1.8.0_144]
        at org.apache.zookeeper.client.StaticHostProvider.<init>(StaticHostProvider.java:61) ~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:445) ~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.curator.utils.DefaultZookeeperFactory.newZooKeeper(DefaultZookeeperFactory.java:29) ~[curator-client-2.7.1.jar:na]
        at org.apache.curator.framework.imps.CuratorFrameworkImpl$2.newZooKeeper(CuratorFrameworkImpl.java:146) ~[curator-framework-2.7.1.jar:na]
        at org.apache.curator.HandleHolder$1.getZooKeeper(HandleHolder.java:94) ~[curator-client-2.7.1.jar:na]
        at org.apache.curator.HandleHolder.getZooKeeper(HandleHolder.java:55) ~[curator-client-2.7.1.jar:na]
        at org.apache.curator.ConnectionState.reset(ConnectionState.java:218) ~[curator-client-2.7.1.jar:na]
        at org.apache.curator.ConnectionState.start(ConnectionState.java:102) ~[curator-client-2.7.1.jar:na]
        at org.apache.curator.CuratorZookeeperClient.start(CuratorZookeeperClient.java:189) ~[curator-client-2.7.1.jar:na]
        at org.apache.curator.framework.imps.CuratorFrameworkImpl.start(CuratorFrameworkImpl.java:248) ~[curator-framework-2.7.1.jar:na]
        at org.apache.drill.exec.coord.zk.ZKClusterCoordinator.<init>(ZKClusterCoordinator.java:106) [drill-java-exec-1.11.0.jar:1.11.0]
        at org.apache.drill.exec.client.DrillClient.connect(DrillClient.java:326) [drill-java-exec-1.11.0.jar:1.11.0]
        at org.apache.drill.jdbc.impl.DrillConnectionImpl.<init>(DrillConnectionImpl.java:158) [drill-jdbc-1.11.0.jar:1.11.0]
        at org.apache.drill.jdbc.impl.DrillJdbc41Factory.newDrillConnection(DrillJdbc41Factory.java:72) [drill-jdbc-1.11.0.jar:1.11.0]
        at org.apache.drill.jdbc.impl.DrillFactory.newConnection(DrillFactory.java:69) [drill-jdbc-1.11.0.jar:1.11.0]
        at org.apache.calcite.avatica.UnregisteredDriver.connect(UnregisteredDriver.java:143) [calcite-avatica-1.4.0-drill-r21.jar:1.4.0-drill-r21]
        at org.apache.drill.jdbc.Driver.connect(Driver.java:72) [drill-jdbc-1.11.0.jar:1.11.0]
        at sqlline.DatabaseConnection.connect(DatabaseConnection.java:167) [sqlline-1.1.9-drill-r7.jar:na]
        at sqlline.DatabaseConnection.getConnection(DatabaseConnection.java:213) [sqlline-1.1.9-drill-r7.jar:na]
        at sqlline.Commands.connect(Commands.java:1083) [sqlline-1.1.9-drill-r7.jar:na]
        at sqlline.Commands.connect(Commands.java:1015) [sqlline-1.1.9-drill-r7.jar:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144]
        at sqlline.ReflectiveCommandHandler.execute(ReflectiveCommandHandler.java:36) [sqlline-1.1.9-drill-r7.jar:na]
        at sqlline.SqlLine.dispatch(SqlLine.java:742) [sqlline-1.1.9-drill-r7.jar:na]
        at sqlline.SqlLine.initArgs(SqlLine.java:528) [sqlline-1.1.9-drill-r7.jar:na]
        at sqlline.SqlLine.begin(SqlLine.java:596) [sqlline-1.1.9-drill-r7.jar:na]
        at sqlline.SqlLine.start(SqlLine.java:375) [sqlline-1.1.9-drill-r7.jar:na]
        at sqlline.SqlLine.main(SqlLine.java:268) [sqlline-1.1.9-drill-r7.jar:na]
Error: Failure in connecting to Drill: org.apache.drill.exec.rpc.RpcException: Failure setting up ZK for client. (state=,code=0)
java.sql.SQLException: Failure in connecting to Drill: org.apache.drill.exec.rpc.RpcException: Failure setting up ZK for client.
        at org.apache.drill.jdbc.impl.DrillConnectionImpl.<init>(DrillConnectionImpl.java:167)
        at org.apache.drill.jdbc.impl.DrillJdbc41Factory.newDrillConnection(DrillJdbc41Factory.java:72)
        at org.apache.drill.jdbc.impl.DrillFactory.newConnection(DrillFactory.java:69)
        at org.apache.calcite.avatica.UnregisteredDriver.connect(UnregisteredDriver.java:143)
        at org.apache.drill.jdbc.Driver.connect(Driver.java:72)
        at sqlline.DatabaseConnection.connect(DatabaseConnection.java:167)
        at sqlline.DatabaseConnection.getConnection(DatabaseConnection.java:213)
        at sqlline.Commands.connect(Commands.java:1083)
        at sqlline.Commands.connect(Commands.java:1015)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sqlline.ReflectiveCommandHandler.execute(ReflectiveCommandHandler.java:36)
        at sqlline.SqlLine.dispatch(SqlLine.java:742)
        at sqlline.SqlLine.initArgs(SqlLine.java:528)
        at sqlline.SqlLine.begin(SqlLine.java:596)
        at sqlline.SqlLine.start(SqlLine.java:375)
        at sqlline.SqlLine.main(SqlLine.java:268)
Caused by: org.apache.drill.exec.rpc.RpcException: Failure setting up ZK for client.
        at org.apache.drill.exec.client.DrillClient.connect(DrillClient.java:329)
        at org.apache.drill.jdbc.impl.DrillConnectionImpl.<init>(DrillConnectionImpl.java:158)
        ... 18 more
Caused by: java.io.IOException: Failure to connect to the zookeeper cluster service within the allotted time of 10000 milliseconds.
        at org.apache.drill.exec.coord.zk.ZKClusterCoordinator.start(ZKClusterCoordinator.java:123)
        at org.apache.drill.exec.client.DrillClient.connect(DrillClient.java:327)
        ... 19 more
apache drill 1.11.0
"a drill in the hand is better than two in the bush"
0: jdbc:drill:>
                        

* 발생 원인

 -> 클러스터링된 해당 서버들의 호스트명을 찾지 못 해서 발생된 에러입니다.

* 조치 사항

 -> 설정 파일의 호스트명 및 포트 번호가 적절하게 기재되어 있는지를 확인합니다.

 -> zookeeper 및 drill 서버가 기동 상태인지 확인을 합니다.