Apache Drill - 无法连接到 zk 客户端答案

【问题标题】：Apache Drill - Unable to connect to zk clientApache Drill - 无法连接到 zk 客户端
【发布时间】：2018-09-10 15:38:47
【问题描述】：

我正在使用 Drill 1.13。当我使用 sqlline.bat -u "jdbc:drill:zk=local"，我可以进入控制台并查询数据库。但是，当我尝试通过应用程序访问钻孔数据库时：使用 jdbc 驱动程序org.apache.drill.jdbc.Driver - 和连接字符串 "jdbc:drill:zk=local".

我收到一个错误：

Caused by: java.sql.SQLException: Failure in connecting to Drill: oadd.org.apache.drill.exec.rpc.RpcException: Failure setting up ZK for client.
    at org.apache.drill.jdbc.impl.DrillConnectionImpl.<init>(DrillConnectionImpl.java:166) [drill-jdbc-all-1.10.0.jar:1.10.0]
    at org.apache.drill.jdbc.impl.DrillJdbc41Factory.newDrillConnection(DrillJdbc41Factory.java:72) [drill-jdbc-all-1.10.0.jar:1.10.0]
    at org.apache.drill.jdbc.impl.DrillFactory.newConnection(DrillFactory.java:69) [drill-jdbc-all-1.10.0.jar:1.10.0]
    at oadd.org.apache.calcite.avatica.UnregisteredDriver.connect(UnregisteredDriver.java:143) [drill-jdbc-all-1.10.0.jar:1.10.0]
    at org.apache.drill.jdbc.Driver.connect(Driver.java:72) [drill-jdbc-all-1.10.0.jar:1.10.0]
    at java.sql.DriverManager.getConnection(DriverManager.java:664) [rt.jar:1.8.0_131]
    at java.sql.DriverManager.getConnection(DriverManager.java:247) [rt.jar:1.8.0_131]
    at org.apache.commons.dbcp2.cpdsadapter.DriverAdapterCPDS.getPooledConnection(DriverAdapterCPDS.java:179) [commons-dbcp2.jar:2.2.0]
    at org.apache.commons.dbcp2.cpdsadapter.DriverAdapterCPDS.getPooledConnection(DriverAdapterCPDS.java:157) [commons-dbcp2.jar:2.2.0]
    at org.apache.commons.dbcp2.datasources.InstanceKeyDataSource.testCPDS(InstanceKeyDataSource.java:1018) [commons-dbcp2.jar:2.2.0]
    at org.apache.commons.dbcp2.datasources.SharedPoolDataSource.registerPool(SharedPoolDataSource.java:167) [commons-dbcp2.jar:2.2.0]
    at org.apache.commons.dbcp2.datasources.SharedPoolDataSource.getPooledConnectionAndInfo(SharedPoolDataSource.java:127) [commons-dbcp2.jar:2.2.0]
    at org.apache.commons.dbcp2.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:884) [commons-dbcp2.jar:2.2.0]
    at org.apache.commons.dbcp2.datasources.InstanceKeyDataSource.getConnection(InstanceKeyDataSource.java:858) [commons-dbcp2.jar:2.2.0]
    at com.vermilionsoftware.vrs.common.util.DBPoolManager.getConnectionWithoutThreadTimeout(DBPoolManager.java:254) [vrsEJBClient.jar:]
    ... 156 more
Caused by: oadd.org.apache.drill.exec.rpc.RpcException: Failure setting up ZK for client.
    at oadd.org.apache.drill.exec.client.DrillClient.connect(DrillClient.java:329) [drill-jdbc-all-1.10.0.jar:1.10.0]
    at org.apache.drill.jdbc.impl.DrillConnectionImpl.<init>(DrillConnectionImpl.java:157) [drill-jdbc-all-1.10.0.jar:1.10.0]
    ... 170 more
Caused by: java.io.IOException: Failure to connect to the zookeeper cluster service within the allotted time of 10000 milliseconds.
    at oadd.org.apache.drill.exec.coord.zk.ZKClusterCoordinator.start(ZKClusterCoordinator.java:123) [drill-jdbc-all-1.10.0.jar:1.10.0]
    at oadd.org.apache.drill.exec.client.DrillClient.connect(DrillClient.java:327) [drill-jdbc-all-1.10.0.jar:1.10.0]
    ... 171 more

知道这里发生了什么，为什么它会从 sqlline 成功连接，而不是 jdbc 连接？

【问题讨论】：

当你退出 Drill 嵌入模式时，drillbit 不再可用。

标签： apache-drill mapr

【解决方案1】：

您是否尝试使用此应用程序以分布式模式连接 Drillbit ？你能分享一些关于设置的细节吗？ zk=local 字符串将使用 sqlline 以嵌入式模式运行 Drill。您也可以参考this link 了解如何使用 JDBC 接口进行连接。

【讨论】：