NotFoundException doing a quick succession of insert/get's on the same CF or
rowkey
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Key: CASSANDRA-2938
URL: https://issues.apache.org/jira/browse/CASSANDRA-2938
Project: Cassandra
Issue Type: Bug
Affects Versions: 0.8.0
Reporter: Cathy Daw
Priority: Minor
Attachments: t910.py
*Issue*
* A customer complained about pycassa.cassandra.c08.ttypes.NotFoundException:
NotFoundException()
* This issue is related to a quick succession of insert/get's. See:
[http://support.datastax.com/tickets/910]
* Customer's AWS instance on EBS: 1 row with 10K columns, with sleep code:
fails 1/10 inserts
* Rackspace:
** We could not reproduce this with the sleep code left in. This was tested
with the SimpleStrategy and NetworkTopologyStrategy.
** 1 row with 10K columns, without sleep code: fails 1/500 inserts
** 10K row with 1 column, without sleep code: Script passes 2 in 5 attempts.
When it fails, it is at about the 4000-5000th insert.
*Stack*
{code}
Traceback (most recent call last):
File "t910.py", line 56, in <module>
test()
File "t910.py", line 43, in test
db.get('testraw', columns=[key, ])
File
"/usr/local/lib/python2.6/dist-packages/pycassa-1.1.0-py2.6.egg/pycassa/columnfamily.py",
line 391, in get
read_consistency_level or self.read_consistency_level)
File
"/usr/local/lib/python2.6/dist-packages/pycassa-1.1.0-py2.6.egg/pycassa/pool.py",
line 380, in new_f
result = getattr(super(ConnectionWrapper, self), f.__name__)(*args,
**kwargs)
File
"/usr/local/lib/python2.6/dist-packages/pycassa-1.1.0-py2.6.egg/pycassa/cassandra/c08/Cassandra.py",
line 422, in get
return self.recv_get()
File
"/usr/local/lib/python2.6/dist-packages/pycassa-1.1.0-py2.6.egg/pycassa/cassandra/c08/Cassandra.py",
line 449, in recv_get
raise result.nfe
pycassa.cassandra.c08.ttypes.NotFoundException: NotFoundException()
{code}
*Script - also attached*
{code}
#!/usr/bin/python
import time
import pycassa
from pycassa import system_manager
from pycassa.system_manager import *
def test():
m = pycassa.system_manager.SystemManager('cathy1:9160')
pool = pycassa.pool.ConnectionPool('testraw',
server_list=['cathy1:9160', ], timeout=5, pool_size=16,
max_overflow=0, prefill=False, pool_timeout=30, max_retries=8)
kspaces = m.list_keyspaces()
if not 'testraw' in kspaces:
m.create_keyspace('testraw', 3)
cfs = m.get_keyspace_column_families('testraw')
if 'testraw' not in cfs:
m.create_column_family('testraw', 'testraw',
comparator_type=system_manager.BYTES_TYPE,
default_validation_class=system_manager.BYTES_TYPE,
row_cache_size=1024 * 1024, key_cache_size=0)
db = pycassa.ColumnFamily(pool, 'testraw',
read_consistency_level=pycassa.ConsistencyLevel.QUORUM,
write_consistency_level=pycassa.ConsistencyLevel.QUORUM)
try:
for i in range(10000):
print 'Inserting %d' % i
# The following code generates 1 row with 10K columns
key = str(i)
db.insert('testraw', {key: ''})
db.get('testraw', columns=[key, ])
# The following code generates 10K rows with 1 columns
#key = 'key' + str(i)
#db.insert(key, {str(i) : ''})
#db.get(key, columns=[str(i), ])
# time.sleep(.1)
finally:
print 'Done'
m.drop_keyspace('testraw')
if __name__ == '__main__':
test()
{code}
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