今天在使用hive的client工具beeline时遇到了一个Invalid URL的错误。环境信息如下：
hiveclient: bd23
hiveserver2: cloud011
hiveclient所在主机的jdk 1.7_51，hive 0.12和hadoop 2.3.0是从服务器端拷贝过来的，环境变量一切OK.
执行连接报了Invalid URL的错误：
$ beeline
Beeline version 0.12.0 by Apache Hive
beeline> !connect jdbc:hive2://cloud011:10000
scan complete in 2ms
Connecting to jdbc:hive2://cloud011:10000
Enter username for jdbc:hive2://cloud011:10000:
Enter password for jdbc:hive2://cloud011:10000:
Error: Invalid URL: jdbc:hive2://cloud011:10000 (state=08S01,code=0)
开始的一段时间都在纠结这个jdbc的URL格式问题，后来在cloudra论坛上找到了一个方法,
直接调用的jdbc:hive2的驱动测试是正常的，证明CLASSPATH等环境变量没有问题。
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$ beeline -u jdbc:hive2://
scan complete in 3ms
Connecting to jdbc:hive2://
...
14/03/18 00:11:48 INFO HiveMetaStore.audit: ugi=bjdpi ip=unknown-ip-addr cmd=get_databases: default
14/03/18 00:11:48 INFO cli.CLIService: SessionHandle [f8c185f0-e491-4f8a-88fa-7f0be7089d23]: openSession()
14/03/18 00:11:48 INFO cli.CLIService: SessionHandle [f8c185f0-e491-4f8a-88fa-7f0be7089d23]: getInfo()
Connected to: Hive (version 0.12.0)
Driver: Hive (version 0.12.0)
Transaction isolation: TRANSACTION_REPEATABLE_READ
Beeline version 0.12.0 by Apache Hive
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这时候感觉很可能不是客户端的问题，矛头指向服务器端：
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# netstat -lanp | grep 10000
tcp 0 0 127.0.0.1:10000 0.0.0.0:* LISTEN 24553/java
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发现绑定的主机地址是localhost，而localhost的地址是127.0.0.1。这应该就是问题所在，从服务器本地测试：
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$ beeline
Beeline version 0.12.0 by Apache Hive
beeline> !connect jdbc:hive2://172.19.1.11:10000
scan complete in 3ms
Connecting to jdbc:hive2://172.19.1.11:10000
Enter username for jdbc:hive2://172.19.1.11:10000:
Enter password for jdbc:hive2://172.19.1.11:10000:
Error: Invalid URL: jdbc:hive2://172.19.1.11:10000 (state=08S01,code=0)
0: jdbc:hive2://172.19.1.11:10000> !connect jdbc:127.0.0.1:10000
scan complete in 0ms
scan complete in 1100ms
No known driver to handle "jdbc:127.0.0.1:10000"
0: jdbc:hive2://172.19.1.11:10000> !connect jdbc:hive2://127.0.0.1:10000
Connecting to jdbc:hive2://127.0.0.1:10000
Enter username for jdbc:hive2://127.0.0.1:10000:
Enter password for jdbc:hive2://127.0.0.1:10000:
Connected to: Hive (version 0.12.0)
Driver: Hive (version 0.12.0)
Transaction isolation: TRANSACTION_REPEATABLE_READ
1: jdbc:hive2://127.0.0.1:10000>
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连接成功！
下面就要把参数改一下，然后重启服务
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<property>
<name>hive.server2.thrift.bind.host</name>
<value>localhost</value>
<description>Bind host on which to run the HiveServer2 Thrift interface.
Can be overridden by setting $HIVE_SERVER2_THRIFT_BIND_HOST</description>
</property>
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重启服务后检查监听地址，这次是正确的了。
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SHELL$ netstat -lanp | grep 10000
tcp 0 0 172.19.1.11:10000 0.0.0.0:* LISTEN 24553/java
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再次在客户端主机上测试连接：
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SHELL$ beeline
Beeline version 0.12.0 by Apache Hive
beeline> !connect jdbc:hive2://172.19.1.11:10000
Connecting to jdbc:hive2://172.19.1.11:10000
Enter username for jdbc:hive2://172.19.1.11:10000:
Enter password for jdbc:hive2://172.19.1.11:10000:
Connected to: Hive (version 0.12.0)
Driver: Hive (version 0.12.0)
Transaction isolation: TRANSACTION_REPEATABLE_READ
0: jdbc:hive2://172.19.1.11:10000>
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成功。
cloudra论坛上下面有个类似的错误：
cannot connect by beeline
http://community.cloudera.com/t5/Batch-SQL-Apache-Hive/Cannot-connect-to-beeline/td-p/5723/page/3
看来当beeline连接失败的时候都会报这个invalid URL的错误，确实给定位问题带来了不小的困难。