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https://issues.apache.org/jira/browse/CASSANDRA-2938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Cathy Daw updated CASSANDRA-2938:
---------------------------------
Attachment: t910.py
> NotFoundException doing a quick succession of insert/get's on the same CF or
> rowkey
> -----------------------------------------------------------------------------------
>
> 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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