我想要做的事情非常基本:使用Python连接到Impala数据库:
from impala.dbapi import connect
conn = connect(host='impala', port=21050, auth_mechanism='PLAIN')
我正在使用Impyla软件包。我收到此错误:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/thriftpy/transport/socket.py", line 96, in open
self.sock.connect(addr)
socket.gaierror: [Errno -3] Temporary failure in name resolution
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/alaaeddine/PycharmProjects/test/data_test.py", line 3, in <module>
conn = connect(host='impala', port=21050, auth_mechanism='PLAIN')
File "/usr/local/lib/python3.6/dist-packages/impala/dbapi.py", line 147, in connect
auth_mechanism=auth_mechanism)
File "/usr/local/lib/python3.6/dist-packages/impala/hiveserver2.py", line 758, in connect
transport.open()
File "/usr/local/lib/python3.6/dist-packages/thrift_sasl/__init__.py", line 61, in open
self._trans.open()
File "/usr/local/lib/python3.6/dist-packages/thriftpy/transport/socket.py", line 104, in open
message="Could not connect to %s" % str(addr))
thriftpy.transport.TTransportException: TTransportException(type=1, message="Could not connect to ('impala', 21050)")
也尝试过Ibis软件包,但失败了,并且存在相同的节俭相关错误。
在使用Dbeaver的Windows中,我可以使用官方Cloudera JDBC连接器连接到数据库。我的问题是:
谢谢!
答案 0 :(得分:0)
已解决: 我用的是pyhive软件包,而不是Ibis / Impyla。这是一个示例:
#import hive from pyhive
from pyhive import hive
#establish the connection to the db
conn = hive.Connection(host='host_IP_addr', port='conn_port', auth='auth_type', database='my_db')
#prepare the cursor for the queries
cursor = conn.cursor()
#execute a query
cursor.execute("SHOW TABLES")
#navigate and display the results
for table in cursor.fetchall():
print(table)
答案 1 :(得分:0)
您的黑斑羚域名不能解析。您可以在命令提示符下执行nslookup impala
吗?如果使用的是Docker,则需要在docker-compose中将docker服务名称设置为“ impala”,或使用“ extra_hosts”选项。或者,您始终可以将其作为impala 127.0.0.1
有时,在关闭安全性的情况下,也可以尝试使用“ NOSASL”而不是PLAIN。
答案 2 :(得分:0)
这是简单的方法,使用python通过impala shell连接impala。
import commands
import re
query1 = "select * from table_name limit 10"
impalad = str('hostname')
port = str('21000')
database = str('database_name')
result_string = 'impala-shell -i "'+ impalad+':'+port +'" -k -B --delimited -q "'+query1+'"'
status, output = commands.getstatusoutput(result_string)
print output
if status == 0:
print output
else:
print "Error encountered while executing HiveQL queries."