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通過JDBC執行鑽查詢的代碼，如果運行W/O錯誤：鑽JDBC飼養員超時錯誤
//val hdpConf = new Configuration()
//val fs = FileSystem.get(hdpConf)
runDrillJdbc()
但是，如果我將取消註釋線與創建FS實例，代碼吹與以下創建連接時DriverManager.getConnection(jdbcUri)錯誤：
16/01/26 08:41:10 ERROR ConnectionState: Connection timed out for connection string (xx:xx) and timeout (5000)/elapsed (5325)
oadd.org.apache.curator.CuratorConnectionLossException: KeeperErrorCode = ConnectionLoss
at oadd.org.apache.curator.ConnectionState.checkTimeouts(ConnectionState.java:198)
at oadd.org.apache.curator.ConnectionState.getZooKeeper(ConnectionState.java:88)
at oadd.org.apache.curator.CuratorZookeeperClient.getZooKeeper(CuratorZookeeperClient.java:115)
at oadd.org.apache.curator.utils.EnsurePath$InitialHelper$1.call(EnsurePath.java:148)
at oadd.org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:107)
at oadd.org.apache.curator.utils.EnsurePath$InitialHelper.ensure(EnsurePath.java:140)
at oadd.org.apache.curator.utils.EnsurePath.ensure(EnsurePath.java:99)
at oadd.org.apache.curator.framework.imps.NamespaceImpl.fixForNamespace(NamespaceImpl.java:74)
at oadd.org.apache.curator.framework.imps.NamespaceImpl.newNamespaceAwareEnsurePath(NamespaceImpl.java:87)
at oadd.org.apache.curator.framework.imps.CuratorFrameworkImpl.newNamespaceAwareEnsurePath(CuratorFrameworkImpl.java:468)
at oadd.org.apache.curator.framework.recipes.cache.PathChildrenCache.<init>(PathChildrenCache.java:223)
at oadd.org.apache.curator.framework.recipes.cache.PathChildrenCache.<init>(PathChildrenCache.java:182)
at oadd.org.apache.curator.x.discovery.details.ServiceCacheImpl.<init>(ServiceCacheImpl.java:65)
at oadd.org.apache.curator.x.discovery.details.ServiceCacheBuilderImpl.build(ServiceCacheBuilderImpl.java:47)
at oadd.org.apache.drill.exec.coord.zk.ZKClusterCoordinator.<init>(ZKClusterCoordinator.java:104)
at oadd.org.apache.drill.exec.client.DrillClient.connect(DrillClient.java:185)
at org.apache.drill.jdbc.impl.DrillConnectionImpl.<init>(DrillConnectionImpl.java:134)
at org.apache.drill.jdbc.impl.DrillJdbc41Factory.newDrillConnection(DrillJdbc41Factory.java:66)
at org.apache.drill.jdbc.impl.DrillFactory.newConnection(DrillFactory.java:69)
at oadd.net.hydromatic.avatica.UnregisteredDriver.connect(UnregisteredDriver.java:126)
at org.apache.drill.jdbc.Driver.connect(Driver.java:72)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:270)
...
注意，我已經隱藏ZK URI，因爲它是不相關具體情況。