Snippets

Cheyin L Cassandra Session Close Test

Created by Cheyin L last modified
cassandra_session_fd_close_test.py
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# -*- coding: utf-8 -*-

import os
import uuid

from cassandra import cluster as cassandra_cluster

cluster = cassandra_cluster.Cluster(("u1.local", "u2.local", "u3.local",))

local_pid = os.getpid()

def logstatus(i, msg):
	return # comment out if need status log
	with open("/tmp/logstatus.txt", "w") as fp:
		fp.write(str(i) + msg + "\n")

for i in xrange(1000):
	dbconn = cluster.connect("system")
	logstatus(i, "... connected")
	qresult = dbconn.execute("SELECT now() FROM system.schema_keyspaces")
	for row in qresult:
		pass
	logstatus(i, "... checked")
	qresult = dbconn.execute("SELECT keyspace_name, durable_writes FROM schema_keyspaces")
	for row in qresult:
		pass
	dbconn.shutdown()
	logstatus(i, "... disconnected")
	
	if 0 == (i % 10):
		print "---", i
		os.system("ls /proc/"+str(local_pid)+"/fd")

print "==="
os.system("ls -l /proc/"+str(local_pid)+"/fd")
print "---"
output-260.txt
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# Test-1 driver version 2.6.0
$ pip freeze
Cython==0.23.4
PyYAML==3.10
blist==1.3.4
bottle==0.12.7
cassandra-driver==2.6.0
futures==3.0.3
pyinotify==0.9.6
scales==1.0.3
six==1.10.0
thrift==0.9.3
web.py==0.37
wsgiref==0.1.2

$ bin/python ~/cassandra_session_fd_close_test.py
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===
total 0
lrwx------ 1 devuser grp01 64 Nov 27 19:00 0 -> /dev/pts/3
lrwx------ 1 devuser grp01 64 Nov 27 19:00 1 -> /dev/pts/3
lrwx------ 1 devuser grp01 64 Nov 27 19:00 2 -> /dev/pts/3
lrwx------ 1 devuser grp01 64 Nov 27 19:00 3 -> socket:[305236109]
---
output-371.txt
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# Test-2 driver version 3.7.1
$ pip freeze
Cython==0.24.1
PyYAML==3.11
argparse==1.2.1
blist==1.3.6
cassandra-driver==3.7.1
distribute==0.6.24
futures==3.0.5
six==1.10.0
thrift==0.9.3
wsgiref==0.1.2

$ bin/python ~/cassandra_session_fd_close_test.py
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===
total 0
lrwx------ 1 devuser grp01 64 Nov 27 18:58 0 -> /dev/pts/3
lrwx------ 1 devuser grp01 64 Nov 27 18:58 1 -> /dev/pts/3
lrwx------ 1 devuser grp01 64 Nov 27 18:58 2 -> /dev/pts/3
lr-x------ 1 devuser grp01 64 Nov 27 18:58 3 -> pipe:[305207029]
l-wx------ 1 devuser grp01 64 Nov 27 18:58 4 -> pipe:[305207029]
lrwx------ 1 devuser grp01 64 Nov 27 18:58 5 -> socket:[305207030]
lrwx------ 1 devuser grp01 64 Nov 27 18:59 6 -> socket:[305217326]
lrwx------ 1 devuser grp01 64 Nov 27 18:59 7 -> socket:[305224209]
lrwx------ 1 devuser grp01 64 Nov 27 18:59 9 -> socket:[305213256]
---

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