This is VERY helpful.
Stay tuned
Jacek
On 11/17/2014 12:14 PM, Tatiana Goldina wrote:
> I tried setting dumpQueriesOnException=true. Here is the query that produces the mysql.general_log in the previous email:
>
> Connection to LSST DB1 failed
> java.sql.SQLException: Qserv error: 'ParseException:ANTLR parse error:unexpected token: /:'
>
> Query being executed when exception was thrown:
>
> /* mysql-connector-java-5.1.6 ( Revision: ${svn.Revision} ) */SHOW VARIABLES WHERE Variable_name ='language' OR Variable_name = 'net_write_timeout' OR Variable_name = 'interactive_timeout' OR Variable_name = 'wait_timeout' OR Variable_name = 'character_set_client' OR Variable_name = 'character_set_connection' OR Variable_name = 'character_set' OR Variable_name = 'character_set_server' OR Variable_name = 'tx_isolation' OR Variable_name = 'transaction_isolation' OR Variable_name = 'character_set_results' OR Variable_name = 'timezone' OR Variable_name = 'time_zone' OR Variable_name = 'system_time_zone' OR Variable_name = 'lower_case_table_names' OR Variable_name = 'max_allowed_packet' OR Variable_name = 'net_buffer_length' OR Variable_name = 'sql_mode' OR Variable_name = 'query_cache_type' OR Variable_name = 'query_cache_size' OR Variable_name = 'init_connect'
>
> On Nov 17, 2014, at 11:53 AM, Tatiana Goldina <[log in to unmask]> wrote:
>
>>
>>> select * from mysql.general_log
>>
>>
>> | 2014-11-17 11:39:54 | qsmaster[qsmaster] @ localhost [] | 26 | 0 | Connect | qsmaster@localhost on qservResult |
>> | 2014-11-17 11:39:54 | qsmaster[qsmaster] @ localhost [] | 26 | 0 | Query | set autocommit=0 |
>> | 2014-11-17 11:39:54 | qsmaster[qsmaster] @ localhost [] | 26 | 0 | Query | CREATE TABLE IF NOT EXISTS qservResult.message_28666954 (chunkId INT, code SMALLINT, message CHAR(255), timeStamp FLOAT) ENGINE=MEMORY;LOCK TABLES qservResult.message_28666954 WRITE |
>> | 2014-11-17 11:39:54 | qsmaster[qsmaster] @ localhost [] | 26 | 0 | Query | UNLOCK TABLES |
>> | 2014-11-17 11:39:54 | qsmaster[qsmaster] @ localhost [] | 26 | 0 | Quit
>>
>>
>> On Nov 14, 2014, at 11:29 PM, Jacek Becla <[log in to unmask]> wrote:
>>
>>> Tatiana, John
>>>
>>> Can you do the following:
>>>
>>> a) turn on general query log for mysqld by adding
>>>
>>> general_log=1
>>> log-output=TABLE
>>>
>>> to /etc/my.cnf under [mysqld]
>>> and restarting mysql
>>>
>>> b) re-run whatever you are typically running that
>>> is having problems via qserv (have it talk to
>>> the mysqld with general log enabled)
>>>
>>> c) send us the output from
>>> select * from mysql.general_log
>>>
>>> I will try to re-play it on my local qserv instance
>>> to reproduce things.
>>>
>>> Thanks,
>>> Jacek
>>>
>>>
>>>
>>> On 11/14/2014 09:01 PM, Jacek Becla wrote:
>>>> Nope! It is not the "set" query. I run it by hand,
>>>> and I got:
>>>>
>>>>
>>>> SET @@session.autocommit = 1;
>>>>
>>>> +------------------------------------------+
>>>> | no-field-name |
>>>> +------------------------------------------+
>>>> | Ignoring meaningless command (in Qserv). |
>>>> +------------------------------------------+
>>>>
>>>> and after that Qserv was happily running.
>>>>
>>>> ---
>>>>
>>>> I don't know how deeply you depend on the query
>>>> that Tatiana mentioned earlier:
>>>>
>>>>
>>>> show columns from DeepSource from LSST;
>>>>
>>>> Because that query will consistently fail right now
>>>> with something like:
>>>>
>>>> ERROR 4110 (Proxy): Qserv error: 'ParseException:ANTLR parse
>>>> error:unexpected token: show:'
>>>>
>>>> we are not supporting "show columns" commands.
>>>>
>>>> We are working on code that will make implementing this
>>>> command easier. Adding support for this is in a quick
>>>> and dirty way right now would be non-trivial.
>>>>
>>>> So, Tatiana / Trey, let us know if you can get away
>>>> without "show columns" queries in the near term.
>>>>
>>>> Jacek
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On 11/12/2014 02:55 PM, Daniel L. Wang wrote:
>>>>> Hi John,
>>>>>
>>>>> I'm betting that the problem occurs here:
>>>>>
>>>>> -> 1291 self._execute_query("SET @@session.autocommit =
>>>>> {0}".format(switch))
>>>>>
>>>>> "SET..." is not supported right now.
>>>>>
>>>>> Qserv doesn't really handle much other than SELECT statements. For the
>>>>> longest time, we were focused on handling those well. Though they aren't
>>>>> perfect, we think qserv handles them well enough to support some
>>>>> practical usage now. One area that has gotten very little attention is
>>>>> in supporting things other than SQL SELECT queries. There is some
>>>>> short-circuit code that handles the few extra commands that the
>>>>> command-line "mysql" binary sends without user intervention, because
>>>>> that's what we test with.
>>>>>
>>>>> I think in this case, the best idea might be to save the proxy logs from
>>>>> connecting with the JDBC driver and with the mysql-connector. None of us
>>>>> (AFAIK) have tested with those, but we could see putting in some more
>>>>> short-circuit code to triage the "extracurricular" queries they send (we
>>>>> can put in some semi-reasonable canned responses), and that could very
>>>>> well get things working. We haven't set aside any space in our Nov
>>>>> sprint to work on this, but we might be able to squeeze it in, deferring
>>>>> existing tickets (Jacek will have to decide).
>>>>>
>>>>> In the meantime, you might be able to workaround this by calling the
>>>>> mysql binary in a shell process and then processing the output. In
>>>>> python, this wouldn't be too bad, and I might claim that the code is
>>>>> only incrementally more complex than using the API, and the performance
>>>>> (in practice) is mostly indistinguishable for, say, up to 10k or 100k
>>>>> result rows.
>>>>>
>>>>> FYI, qserv internally uses mysqldb when connecting to mysqld through
>>>>> Python, and the raw mysql C-API when connecting with C++.
>>>>>
>>>>> Hope this helps,
>>>>> -Daniel
>>>>>
>>>>>
>>>>> On 11/11/2014 08:27 PM, John Rector wrote:
>>>>>> Hi Daniel,
>>>>>>
>>>>>> This is a follow-up on my earlier note about trouble accessing Qserv
>>>>>> with JDBC. I tried a python module as well. (Results are not in the
>>>>>> logs I sent you, but I can send them if it's helpful.)
>>>>>>
>>>>>> ~> pip list | grep mysql
>>>>>> *mysql-connector-python (2.0.2)*
>>>>>>
>>>>>> It worked when I tried to connect to a standard MySQL db, but not when
>>>>>> I tried to connect to qserv. Immediately following the failure, I cut
>>>>>> and pasted the qserv connection values I had used into a /mysql/
>>>>>> command in the same terminal session. That connect to the LSST db.
>>>>>> Below is the output from the Python connection attempt.
>>>>>>
>>>>>> BTW: is there a preferred Python module to use with qserv? I have a
>>>>>> few, but tried only one tonight—the one from the MySQL site. One more
>>>>>> question, has anyone tried to fill a Pandas data frame directly from a
>>>>>> qserv query?
>>>>>>
>>>>>> My ipython session:
>>>>>>
>>>>>> In [1]: *import mysql.connector*
>>>>>>
>>>>>> In [2]:*cnx = mysql.connector.connect(user='qsmaster',
>>>>>> host='lsst-db1.ipac.caltech.edu <http://lsst-db1.ipac.caltech.edu>',
>>>>>> database='LSST', port=4040)*
>>>>>>
>>>>>> ---------------------------------------------------------------------------
>>>>>>
>>>>>> InternalError Traceback (most recent call
>>>>>> last)
>>>>>> <ipython-input-2-15e0754e8f3a> in <module>()
>>>>>> ----> 1 cnx = mysql.connector.connect(user='qsmaster',
>>>>>> host='lsst-db1.ipac.caltech.edu <http://lsst-db1.ipac.caltech.edu>',
>>>>>> database='LSST', port=4040)
>>>>>>
>>>>>> /Users/johnrector/anaconda/lib/python2.7/site-packages/mysql/connector/__init__.pyc
>>>>>>
>>>>>> in connect(*args, **kwargs)
>>>>>> 157
>>>>>> 158 # Regular connection
>>>>>> --> 159 return MySQLConnection(*args, **kwargs)
>>>>>> 160 Connect = connect # pylint: disable=C0103
>>>>>> 161
>>>>>>
>>>>>> /Users/johnrector/anaconda/lib/python2.7/site-packages/mysql/connector/connection.pyc
>>>>>>
>>>>>> in __init__(self, *args, **kwargs)
>>>>>> 127
>>>>>> 128 if len(kwargs) > 0:
>>>>>> --> 129 self.connect(**kwargs)
>>>>>> 130
>>>>>> 131 def _get_self(self):
>>>>>>
>>>>>> /Users/johnrector/anaconda/lib/python2.7/site-packages/mysql/connector/connection.pyc
>>>>>>
>>>>>> in connect(self, **kwargs)
>>>>>> 453 self.disconnect()
>>>>>> 454 self._open_connection()
>>>>>> --> 455 self._post_connection()
>>>>>> 456
>>>>>> 457 def shutdown(self):
>>>>>>
>>>>>> /Users/johnrector/anaconda/lib/python2.7/site-packages/mysql/connector/connection.pyc
>>>>>>
>>>>>> in _post_connection(self)
>>>>>> 433 """
>>>>>> 434 self.set_charset_collation(self._charset_id)
>>>>>> --> 435 self.autocommit = self._autocommit
>>>>>> 436 if self._time_zone:
>>>>>> 437 self.time_zone = self._time_zone
>>>>>>
>>>>>> /Users/johnrector/anaconda/lib/python2.7/site-packages/mysql/connector/connection.pyc
>>>>>>
>>>>>> in set_autocommit(self, value)
>>>>>> 1289 """Toggle autocommit"""
>>>>>> 1290 switch = 'ON' if value else 'OFF'
>>>>>> -> 1291 self._execute_query("SET @@session.autocommit =
>>>>>> {0}".format(switch))
>>>>>> 1292 self._autocommit = value
>>>>>> 1293
>>>>>>
>>>>>> /Users/johnrector/anaconda/lib/python2.7/site-packages/mysql/connector/connection.pyc
>>>>>>
>>>>>> in _execute_query(self, query)
>>>>>> 1495 """
>>>>>> 1496 if self._unread_result is True:
>>>>>> -> 1497 raise errors.InternalError("Unread result found.")
>>>>>> 1498
>>>>>> 1499 self.cmd_query(query)
>>>>>>
>>>>>> InternalError: Unread result found.
>>>>>>
>>>>>> ______________________________
>>>>>> John Rector
>>>>>> IPAC, California Institute of Technology
>>>>>> MS 100-22
>>>>>> 770 S. Wilson Ave.
>>>>>> Pasadena, CA 91125
>>>>>> USA
>>>>>> Tel: (626) 395—8577
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
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