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November 7, 2018 15:47
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Rough estimation of a C* table size
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#!/usr/bin/env python | |
import subprocess, shlex, re | |
from argparse import ArgumentParser | |
def tsize(type): | |
sizes = { | |
("text", "varchar", "inet", "varint", "blob", "uuid", "timeuuid"): 16, | |
("bigint", "date", "decimal", "double", "timestamp", "time"): 8, | |
("boolean", "tinyint"): 1 | |
} | |
for k, v in sizes.iteritems(): | |
if type in k: | |
return v | |
return 4 | |
if __name__ == '__main__': | |
parser = ArgumentParser() | |
parser.add_argument('-t', '--table', required=True) | |
parser.add_argument('-n', '--number', default=1, type=int) | |
parser.add_argument('-p', '--partsize', default=1, type=int) | |
args = parser.parse_args() | |
p1 = subprocess.Popen(shlex.split("cqlsh -u ocs_superuser -p password -e \"desc smart.%s\"" % args.table), | |
stdout=subprocess.PIPE) | |
p2 = subprocess.Popen(shlex.split("sed -n '/^CREATE/,/^)/{//!p}'"), stdin=p1.stdout, stdout=subprocess.PIPE) | |
p1.stdout.close() | |
desc = p2.communicate()[0].splitlines() | |
colsizes = {} | |
primary_keys = [] | |
clustering = [] | |
if "PRIMARY KEY" in desc[0]: | |
primary_keys.append(desc[0].split()[0]) | |
elif "PRIMARY KEY" in desc[-1]: | |
pk = re.sub(r'^.*KEY ', '', desc[-1])[1:-1] | |
if pk[0] == '(': | |
primary_keys += pk[pk.find("(") + 1: pk.find(")")].split(", ") | |
clustering = pk[pk.find(")") + 3:].split(", ") | |
primary_keys += clustering | |
else: | |
primary_keys = pk.split(", ") | |
clustering = primary_keys[1:] | |
desc = desc[:-1] | |
for line in desc: | |
linesplit = line.split() | |
colsizes[linesplit[0]] = tsize(linesplit[1][:-1]) | |
print(colsizes) | |
print(primary_keys) | |
print(clustering) | |
metadata_size = 8 * len(colsizes) | |
pk_size = sum(colsizes[col] for col in primary_keys) | |
ck_size = sum(colsizes[col] for col in clustering) | |
reg_col_sizes = sum(colsizes.values()) - pk_size | |
print(args.number * (pk_size + args.partsize * (reg_col_sizes + ck_size) + metadata_size)) |
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