Impala在线文档介绍了 Impala ODBC接口安装和配置
http://www.cloudera.com/content/cloudera-content/cloudera-docs/CDH5/latest/Impala/Installing-and-Using-Impala/ciiu_impala_odbc.html
Impala ODBC 驱动下载地址：
http://www.cloudera.com/content/support/en/downloads/connectors.html
本文详细讲解了CentOS-6.5-x86_64环境下 Impala ODBC的安装和使用。
一、检查unixODBC是否安装：
rpm -qa|grep unixODBC
如果没有安装，使用下面的命令安装：
yum install unixODBC
yum install unixODBC-devel
使用odbcinst命令查看unixODBC配置文件路径，不同版本的unixODBC配置文件路径是不同的，如果是源代码方式安装unixODBC，也可以通过编译参数--sysconfdir指定。
- [root@h1 ~]# odbcinst -j
- unixODBC 2.2.14
- DRIVERS............: /etc/odbcinst.ini
- SYSTEM DATA SOURCES: /etc/odbc.ini
- FILE DATA SOURCES..: /etc/ODBCDataSources
- USER DATA SOURCES..: /root/.odbc.ini
- SQLULEN Size.......: 8
- SQLLEN Size........: 8
- SQLSETPOSIROW Size.: 8
二、安装Impala ODBC驱动
下载ClouderaImpalaODBC-2.5.15.1015-1.el6.x86_64.rpm，保存到：/home/soft 目录，并进行安装：
- [root@h1 soft]# ll
- total 16232
- -rw-r--r--. 1 root root 16619934 Aug 24 06:37 ClouderaImpalaODBC-2.5.15.1015-1.el6.x86_64.rpm
- [root@h1 soft]# rpm -ivh ClouderaImpalaODBC-2.5.15.1015-1.el6.x86_64.rpm
- Preparing... ########################################### [100%]
- 1:ClouderaImpalaODBC ########################################### [100%]
- [root@h1 soft]#
安装完成后的文件在：/opt/cloudera/impalaodbc 目录，这个目录包含了安装文档、lib包、配置文件示例。
- [root@h1 impalaodbc]# pwd
- /opt/cloudera/impalaodbc
- [root@h1 impalaodbc]# ll
- total 1016
- -rwxr-xr-x. 1 root root 1007048 Apr 21 12:21 Cloudera ODBC Driver for Impala Install Guide.pdf
- -rwxr-xr-x. 1 root root 12003 Apr 21 12:21 Cloudera-EULA.txt
- drwxr-xr-x. 3 root root 4096 Aug 24 07:15 ErrorMessages
- -rwxr-xr-x. 1 root root 3261 Apr 21 12:21 Readme.txt
- -rwxr-xr-x. 1 root root 2350 Apr 21 12:21 Release Notes.txt
- drwxr-xr-x. 2 root root 4096 Aug 24 07:15 Setup
- drwxr-xr-x. 3 root root 4096 Aug 24 07:15 lib
- [root@h1 impalaodbc]#
设置驱动的环境变量：
在 /etc/profile 最后添加：
export LD_LIBRARY_PATH=/usr/local/lib:/opt/cloudera/impalaodbc/lib/64
然后执行：source /etc/profile
使修改的脚本立即生效。
拷贝：cloudera.impalaodbc.ini 到 /etc/目录：
- [root@h1 Setup]# pwd
- /opt/cloudera/impalaodbc/Setup
- [root@h1 Setup]# cp cloudera.impalaodbc.ini /etc/
- [root@h1 Setup]#
修改：/etc/cloudera.impalaodbc.ini 中的如下条目：
- # Generic ODBCInstLib
- # iODBC
- #ODBCInstLib=libiodbcinst.so
- # SimbaDM / unixODBC
- ODBCInstLib=libodbcinst.so
也就是说不使用iODBC , 使用 unixODBC
三、修改/etc/odbc.ini 文件
参照 /opt/cloudera/impalaodbc/Setup/odbc.ini , 在/etc/odbc.ini 添加如下的内容：
- [impalaodbc]
- # Description: DSN Description.
- # This key is not necessary and is only to give a description of the data source.
- Description=Cloudera ODBC Driver for Impala (64-bit) DSN
- # Driver: The location where the ODBC driver is installed to.
- Driver=/opt/cloudera/impalaodbc/lib/64/libclouderaimpalaodbc64.so
- # The DriverUnicodeEncoding setting is only used for SimbaDM
- # When set to 1, SimbaDM runs in UTF-16 mode.
- # When set to 2, SimbaDM runs in UTF-8 mode.
- #DriverUnicodeEncoding=2
- # Values for HOST, PORT, KrbFQDN, and KrbServiceName should be set here.
- # They can also be specified on the connection string.
- HOST=172.16.230.152
- PORT=21050
- Database=default
- # The authentication mechanism.
- # 0 - no authentication.
- # 1 - Kerberos authentication
- # 2 - Username authentication.
- # 3 - Username/password authentication.
- # 4 - Username/password authentication with SSL.
- AuthMech=0
- # Kerberos related settings.
- KrbFQDN=
- KrbRealm=
- KrbServiceName=
- # Username/password authentication with SSL settings.
- UID=
- PWD=
- CAIssuedCertNamesMismatch=1
- TrustedCerts=/opt/cloudera/impalaodbc/lib/64/cacerts.pem
- # Specify the proxy user ID to use.
- #DelegationUID=
- # General settings
- TSaslTransportBufSize=1000
- RowsFetchedPerBlock=1000
- SocketTimeout=0
- StringColumnLength=32767
- UseNativeQuery=0
四、验证安装是否成功
执行 isql -v impalaodbc
- [root@h1 ~]# isql -v impalaodbc
- +---------------------------------------+
- | Connected! |
- | |
- | sql-statement |
- | help [tablename] |
- | quit |
- | |
- +---------------------------------------+
- SQL> select * from tab1;
- [S1000][unixODBC][Cloudera][ImpalaODBC] (110) Error while executing a query in Impala: [HY000] : Error: Error: could not match input
- [ISQL]ERROR: Could not SQLPrepare
- SQL> select * from tab1
- +------------+------+-------------------------+------------------------------+
- | id | col_1| col_2 | col_3 |
- +------------+------+-------------------------+------------------------------+
- | 1 | 1 | 123.123 | 2012-10-24 08:55:00 |
- | 2 | 0 | 1243.5 | 2012-10-25 13:40:00 |
- | 3 | 0 | 24453.325 | 2008-08-22 09:33:21.123000000|
- | 4 | 0 | 243423.325 | 2007-05-12 22:32:21.334540000|
- | 5 | 1 | 243.325 | 1953-04-22 09:11:33 |
- +------------+------+-------------------------+------------------------------+
- SQLRowCount returns -1
- 5 rows fetched
注意：执行的sql最后不要加封号。
这样配置后，C/C++程序就可以通过unixODBC访问Impala中的数据了。
五、License问题
默认安装的Impala ODBC是评估版的，需要购买license，参见安装文档 Cloudera ODBC Driver for Impala Install Guide.pdf 中的这样一段话：
If you are installing a driver with an evaluation license and you have purchased a perpetual license, then copy the License.lic file you received via e-mail into the /opt/cloudera/impalaodbc/lib/32 or /opt/cloudera/impalaodbc/lib/64 folder, depending on the version of the driver you installed.
评估时为多长时间，目前还没找到答案。或者让你一直评估吧：）
本文转载： http://blog.csdn.net/yangzhaohui168/article/details/38800803