Question

I am using django-1.2 and python-2.6 and I am using mysql server.

After working for a while – selecting and updating records, I got this error:

Exception in thread Thread-269:
Traceback (most recent call last):
  File "/usr/lib64/python2.6/threading.py", line 532, in __bootstrap_inner
  File "dispatcher.py", line 42, in run
  File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 80, in __len__  
  File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 271, in iterator  
  File "/usr/lib/python2.6/site-packages/django/db/models/sql/compiler.py", line 677, in results_iter  
  File "/usr/lib/python2.6/site-packages/django/db/models/sql/compiler.py", line 731, in execute_sql  
  File "/usr/lib/python2.6/site-packages/django/db/backends/__init__.py", line 75, in cursor  
  File "/usr/lib/python2.6/site-packages/django/db/backends/mysql/base.py", line 297, in _cursor  
  File "/usr/lib64/python2.6/site-packages/MySQLdb/__init__.py", line 81, in Connect  
  File "/usr/lib64/python2.6/site-packages/MySQLdb/connections.py", line 187, in __init__  
OperationalError: (2001, "Can't create UNIX socket (24)")

here are lines 41,42 of my dispatcher.py:

dataList = Mydata.objects.filter(date__isnull=True)[:chunkSize]
print '%s - DB worker finished reading %s entrys' % (datetime.now(),len(dataList))

Any clue why I get this error?
I tried googling but could not find an answer.

I am connecting to the db using django – (I am using localhost)

Answer 1

On my machine, errno==24 is defined like

#define EMFILE          24      /* Too many open files */

Which means you are running out of filedescriptors. Your app is “leaking” filedescriptors by opening them (and not closing them) again and again.