impala使用

1.登陆

impala-shell -i cslave1

2.refresh

refresh table_name:当有文件更新时

INVALIDATE METADATA；当有刚创建的表

3.中文code不支持问题

impala-shell -i cslave1

[cslave1:21000] >select count(1) from s_trade where receiver_name = '李丹';

Unknown Exception : 'ascii' codec can't encode characters in position: ordinal not in range

官方issue https://issues.cloudera.org/browse/IMPALA-607
解决：

vim /usr/lib/impala-shell/impala_shell.py

def do_select(self, args):

    """Executes a SELECT... query, fetching all rows"""

    return self.__execute_query(self.__create_beeswax_query("select %s" % args))

修改成：

def do_select(self, args):

    """Executes a SELECT... query, fetching all rows"""

    return self.__execute_query(self.__create_beeswax_query("select %s" %(args.encode('utf-8'),)))

修改后：

[cslave1:21000] > select count(1) from s_trade where receiver_name = '李丹';

Query: select count(1) from s_trade where receiver_name = '李丹'

+----------+

| count(1) |

+----------+

| 822      |

+----------+

Returned 1 row(s) in 1.62s