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# Dependencies: | |
# On CentOS you can install psycopg2 thus: | |
# | |
# sudo yum install postgresql-libs | |
# sudo yum install python-psycopg2 | |
import psycopg2 | |
from threading import Thread,Semaphore | |
import random | |
import time | |
# Test Params: | |
num_items=1000 | |
percentage_red=20 # about 20% rows are red and remaining are green. | |
cluster_ip="localhost" | |
cluster_ip="172.151.29.251" | |
connect_string="host={} dbname=yugabyte user=yugabyte port=5433".format(cluster_ip) | |
def create_table(): | |
conn = psycopg2.connect(connect_string) | |
conn.set_session(autocommit=True) | |
cur = conn.cursor() | |
cur.execute("""DROP TABLE IF EXISTS items"""); | |
print("Dropped (if exists): items table") | |
print("====================") | |
cur.execute(""" | |
CREATE TABLE IF NOT EXISTS items ( | |
id integer, | |
color text, | |
PRIMARY KEY(id) | |
) | |
""") | |
print("Created items table.") | |
# cur.execute("""CREATE INDEX IF NOT EXISTS color_idx ON items(color)""") | |
# print("Created color_idx on table") | |
print("Sleeping 30 seconds for tablets to balance"); | |
time.sleep(30) | |
cur.close() | |
conn.close() | |
def init_rows(): | |
conn = psycopg2.connect(connect_string) | |
conn.set_session(autocommit=True) | |
cur = conn.cursor(); | |
print("Populating rows") | |
for idx in range(num_items): | |
if (random.randint(1, 100) <= percentage_red): | |
color = 'red' | |
else: | |
color = 'green' | |
cur.execute("""INSERT INTO items(id, color) VALUES (%s, %s)""", (idx, color)) | |
print("====================") | |
cur.close() | |
conn.close() | |
def select_rows(num_rows_to_update, for_update): | |
conn = psycopg2.connect(connect_string) | |
cur = conn.cursor() | |
b_delta = 0 | |
s_delta = 0 | |
c_delta = 0 | |
for idx in range(num_rows_to_update): | |
t1 = time.time() | |
cur.execute("BEGIN") | |
t2 = time.time() | |
b_delta = b_delta + (t2 - t1) | |
t1 = time.time() | |
if (for_update): | |
cur.execute("SELECT id, color FROM items WHERE id = %s FOR UPDATE", (idx, )) | |
else: | |
cur.execute("SELECT id, color FROM items WHERE id = %s", (idx, )) | |
t2 = time.time() | |
s_delta = s_delta + (t2 - t1) | |
t1 = time.time() | |
cur.execute("COMMIT") | |
t2 = time.time() | |
c_delta = c_delta + (t2 - t1) | |
print("Avg BEGIN Time: %s ms" % (((b_delta) * 1000) / num_rows_to_update)) | |
if (for_update): | |
print("Avg SELECT .. FOR UPDATE Time: %s ms" % (((s_delta) * 1000) / num_rows_to_update)) | |
else: | |
print("Avg SELECT Time: %s ms" % (((s_delta) * 1000) / num_rows_to_update)) | |
print("Avg COMMIT Time: %s ms" % (((c_delta) * 1000) / num_rows_to_update)) | |
cur.close() | |
conn.close() | |
# Main | |
create_table() | |
init_rows() | |
select_rows(100, False) # Simple SELECT | |
select_rows(100, True) # SELECT .. FOR UPDATE |
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Sample out against a RF=3 (multi-zone cluster):