CODEWITHSUNDEEP
pythonhadoophive
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Reputation: 69

Required field 'sessionHandle' is unset! while using hive with python

I have tried various approach of using hive with python.

One is

How to Access Hive via Python?

Also tried https://sites.google.com/site/tingyusz/home/blogs/hiveinpython

Where I am getting 

  File "py_hive.py", line 8, in <module>
    database='default') as conn:
  File "/home/karimk/python/lib/python2.7/site-packages/pyhs2/__init__.py", line 7, in connect
    return Connection(*args, **kwargs)
  File "/home/karimk/python/lib/python2.7/site-packages/pyhs2/connections.py", line 52, in __init__
    cur.execute(query) 
  File "/home/karimk/python/lib/python2.7/site-packages/pyhs2/cursor.py", line 61, in execute
    res = self.client.ExecuteStatement(query)
  File "/home/karimk/python/lib/python2.7/site-packages/pyhs2/TCLIService/TCLIService.py", line 244, in ExecuteStatement
    return self.recv_ExecuteStatement()
  File "/home/karimk/python/lib/python2.7/site-packages/pyhs2/TCLIService/TCLIService.py", line 260, in recv_ExecuteStatement
    raise x
thrift.Thrift.TApplicationException: Required field 'sessionHandle' is unset! Struct:TExecuteStatementReq(sessionHandle:null, statement:USE default, confOverlay:{})

Python code:

import pyhs2

with pyhs2.connect(host='dmeet-master02.inetuhosted.net',
                   port=10000,
                   authMechanism="PLAIN",
                   user='userk',
                   password='userk',
                   database='default') as conn:
    with conn.cursor() as cur:
        #Show databases
        print cur.getDatabases()

        #Execute query
        cur.execute("select * from table")

        #Return column info from query
        print cur.getSchema()

        #Fetch table results
        for i in cur.fetch():
            print i
            break

any hint on this?

Upvotes: 3

Views: 2754

Answers (1)

arbazkhan002
arbazkhan002

Reputation: 1333

I am using a similar initialization code for connecting with Hive and it works for me.

But, I can see that it's failing to initialize the connection. The field sessionHandle is set internally while opening connection with the server. It is unset (or set to None) when corresponding socket connection can't be opened. Try reaching without specifying a database and see if it works.

Upvotes: 1

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