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py-table-checksum.py
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py-table-checksum.py
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# -*- coding=utf-8 -*-
import mysql.connector
import sys
import datetime
from settings import DB_SOURCE, DB_TARGET, TABLES_CHECK, DB_CHECKSUM
global tbl_key_end
def get_db_conn(**db_conn_info):
db_host = db_conn_info['host']
db_user = db_conn_info['user']
db_pass = db_conn_info['password']
db_port = db_conn_info['port']
db_name = db_conn_info.get('database', None)
db_charset = db_conn_info.get('charset', 'utf8mb4')
try:
conn = mysql.connector.connect(host=db_host,
user=db_user,
password=db_pass,
port=db_port,
charset=db_charset,
use_unicode=True)
except mysql.connector.Error as e:
print("Error %s: %s" % (e.args[0], e.args[1]))
sys.exit(-1)
return conn
def before_checksum(db, tbl):
checksum_db_conn = get_db_conn(**DB_CHECKSUM)
checksum_db_cur = checksum_db_conn.cursor(dictionary=True)
sql_str = """
CREATE TABLE IF NOT EXISTS `checksum`.`t_checksum` (
db CHAR(64) NOT NULL,
tbl CHAR(64) NOT NULL,
chunk INT NOT NULL,
chunk_time FLOAT NULL,
chunk_index VARCHAR(200) NULL,
lower_boundary TEXT NULL,
upper_boundary TEXT NULL,
chunk_key_start bigint NOT NULL,
chunk_key_end bigint NOT NULL,
source_crc CHAR(40) NOT NULL,
source_cnt INT NOT NULL,
target_crc CHAR(40) NULL,
target_cnt INT NULL,
ts TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
PRIMARY KEY (db, tbl, chunk),
INDEX ts_db_tbl (ts, db, tbl)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
"""
checksum_db_cur.execute(sql_str)
sql_str = "DELETE FROM `checksum`.`t_checksum` WHERE db=%s and tbl=%s"
param = (db, tbl)
checksum_db_cur.execute(sql_str, param)
checksum_db_conn.commit()
checksum_db_cur.close()
checksum_db_conn.close()
def get_cols(db_name, table_name, **db_info):
db_conn = get_db_conn(**db_info)
db_cur = db_conn.cursor(dictionary=True)
sql_cols_cols = "select GROUP_CONCAT(COLUMN_NAME ORDER BY ordinal_position) as cols " \
"from information_schema.COLUMNS " \
"where table_schema=%s and table_name =%s"
sql_param = (db_name, table_name)
db_cur.execute(sql_cols_cols, sql_param)
res = db_cur.fetchall()
db_cur.close()
db_conn.close()
if res[0]['cols'] is not None:
return res[0]['cols']
else:
print("Error: table %s does not exist" % table_name)
sys.exit(-1)
def get_pri_key(db_name, table_name, **db_info):
db_conn = get_db_conn(**db_info)
db_cur = db_conn.cursor(dictionary=True)
sql_pri_key = "select COLUMN_NAME as pri_key from information_schema.`COLUMNS` " \
"where table_schema=%s and table_name=%s and column_key='PRI'"
sql_param = (db_name, table_name)
db_cur.execute(sql_pri_key, sql_param)
res = db_cur.fetchall()
db_cur.close()
db_conn.close()
if res[0]['pri_key'] is not None:
return res[0]['pri_key']
else:
print("Error: table %s does not exist" % table_name)
sys.exit(-1)
def source_checksum(db, tbl):
before_checksum(db, tbl)
tab_cols = get_cols(db, tbl, **DB_SOURCE)
pri_key = get_pri_key(db, tbl, **DB_SOURCE)
source_db_conn = get_db_conn(**DB_SOURCE)
source_db_cur = source_db_conn.cursor(dictionary=True)
checksum_db_conn = get_db_conn(**DB_CHECKSUM)
checksum_db_cur = checksum_db_conn.cursor(dictionary=True)
chunk_no = 0
while True:
chunk_key_start, chunk_key_end = get_chunk_range(db, tbl, pri_key, chunk_no, checksum_db_cur)
if chunk_key_start != chunk_key_end:
sql_str = "SELECT " \
"COUNT(*) AS cnt, " \
"COALESCE(LOWER(CONV(BIT_XOR(CAST(CRC32(CONCAT_WS('#', %s)) AS UNSIGNED)), 10, 16)), 0) AS crc " \
"FROM %s.%s FORCE INDEX (`PRIMARY`) " \
"WHERE (%s >= %s AND %s < %s)" \
% (tab_cols, db, tbl, pri_key, chunk_key_start, pri_key, chunk_key_end)
else:
sql_str = "SELECT " \
"COUNT(*) AS cnt, " \
"COALESCE(LOWER(CONV(BIT_XOR(CAST(CRC32(CONCAT_WS('#', %s)) AS UNSIGNED)), 10, 16)), 0) AS crc " \
"FROM %s.%s FORCE INDEX (`PRIMARY`) " \
"WHERE (%s = %s)" % (tab_cols, db, tbl, pri_key, chunk_key_end)
source_db_cur.execute(sql_str)
res = source_db_cur.fetchall()
row_cnt = res[0]['cnt']
chunk_crc = res[0]['crc']
res_chunk_sql = "insert into `checksum`.`t_checksum` " \
"(db, tbl, chunk, chunk_key_start, chunk_key_end, source_cnt, source_crc)" \
"values (%s, %s, %s, %s, %s, %s, %s)"
res_chunk_para = (db, tbl, chunk_no, chunk_key_start, chunk_key_end, row_cnt, chunk_crc)
# print(res_chunk_para)
checksum_db_cur.execute(res_chunk_sql, res_chunk_para)
checksum_db_conn.commit()
chunk_no += 1
if chunk_key_start == chunk_key_end:
source_db_cur.close()
source_db_conn.close()
checksum_db_cur.close()
checksum_db_conn.close()
break
return "Source table: %s.%s checksum done." % (db, tbl)
def target_checksum(db, tbl):
tab_cols = get_cols(db, tbl, **DB_TARGET)
pri_key = get_pri_key(db, tbl, **DB_TARGET)
target_db_conn = get_db_conn(**DB_TARGET)
target_db_cur = target_db_conn.cursor(dictionary=True)
checksum_db_conn = get_db_conn(**DB_CHECKSUM)
checksum_db_cur = checksum_db_conn.cursor(dictionary=True)
sql_str = "select chunk, chunk_key_start, chunk_key_end " \
"from `checksum`.`t_checksum` FORCE INDEX (PRIMARY)" \
"where db='%s' and tbl='%s'" % (db, tbl)
checksum_db_cur.execute(sql_str)
res = checksum_db_cur.fetchall()
for chunk in res:
chunk_key_start, chunk_key_end = (chunk['chunk_key_start'], chunk['chunk_key_end'])
if chunk_key_start != chunk_key_end:
sql_str = "SELECT " \
"COUNT(*) AS cnt, " \
"COALESCE(LOWER(CONV(BIT_XOR(CAST(CRC32(CONCAT_WS('#', %s)) AS UNSIGNED)), 10, 16)), 0) AS crc " \
"FROM %s.%s FORCE INDEX (`PRIMARY`) " \
"WHERE (%s >= %s AND %s < %s)" \
% (tab_cols, db, tbl, pri_key, chunk_key_start, pri_key, chunk_key_end)
else:
sql_str = "SELECT " \
"COUNT(*) AS cnt, " \
"COALESCE(LOWER(CONV(BIT_XOR(CAST(CRC32(CONCAT_WS('#', %s)) AS UNSIGNED)), 10, 16)), 0) AS crc " \
"FROM %s.%s FORCE INDEX (`PRIMARY`) " \
"WHERE (%s = %s)" % (tab_cols, db, tbl, pri_key, chunk_key_end)
target_db_cur.execute(sql_str)
res = target_db_cur.fetchall()
row_cnt = res[0]['cnt']
chunk_crc = res[0]['crc']
res_chunk_sql = "update `checksum`.`t_checksum` FORCE INDEX (PRIMARY)" \
"set `target_cnt`=%s, `target_crc`=%s " \
"where `chunk`=%s and `db`=%s and `tbl`=%s"
res_chunk_para = (row_cnt, chunk_crc, chunk['chunk'], db, tbl)
# print(res_chunk_para)
checksum_db_cur.execute(res_chunk_sql, res_chunk_para)
checksum_db_conn.commit()
target_db_cur.close()
target_db_conn.close()
checksum_db_cur.close()
checksum_db_conn.close()
return "Target table: %s.%s checksum done." % (db, tbl)
def get_chunk_range(db_name, table_name, primary_key, chunk_no, cs_db_cur):
chunk = 1500
source_db_conn = get_db_conn(**DB_SOURCE)
source_db_cur = source_db_conn.cursor(dictionary=True)
if chunk_no == 0:
sql_str = "SELECT MIN(%s) as min_value, MAX(%s) as max_value FROM %s.%s FORCE INDEX (PRIMARY)" \
% (primary_key, primary_key, db_name, table_name)
source_db_cur.execute(sql_str)
res = source_db_cur.fetchall()
tbl_key_start = res[0]['min_value']
globals()['tbl_key_end'] = res[0]['max_value']
chunk_key_start = tbl_key_start
source_db_cur.close()
source_db_conn.close()
else:
sql_str = "SELECT MAX(`chunk_key_end`) as chunk_key_end FROM `checksum`.`t_checksum` FORCE INDEX (PRIMARY)" \
"WHERE db='%s' and tbl='%s'" % (db_name, table_name)
# print(sql_str)
cs_db_cur.execute(sql_str)
res = cs_db_cur.fetchall()
# print(res[0])
chunk_key_start = res[0]['chunk_key_end']
if chunk_key_start + chunk <= tbl_key_end:
return chunk_key_start, chunk_key_start + chunk
else:
return chunk_key_start, tbl_key_end
def chunk_compare(db, tbl):
cs_db_conn = get_db_conn(**DB_CHECKSUM)
cs_db_cur = cs_db_conn.cursor(dictionary=True)
compare_sql = "SELECT `chunk`, `chunk_key_start`, `chunk_key_end` " \
"FROM `checksum`.`t_checksum` FORCE INDEX (PRIMARY) " \
"WHERE `db`=%s AND `tbl`=%s " \
"AND (`source_cnt`<>`target_cnt` OR `source_crc`<>`target_crc`)"
compare_para = (db, tbl)
cs_db_cur.execute(compare_sql, compare_para)
res = cs_db_cur.fetchall()
if cs_db_cur.rowcount != 0:
return res
else:
return False
def checksum_rows(db, tbl, key_start, key_end, **db_info):
db_conn = get_db_conn(**db_info)
db_cur = db_conn.cursor(dictionary=True)
tab_cols = get_cols(db, tbl, **db_info)
pri_key = get_pri_key(db, tbl, **db_info)
sql_str = "select %s as pri_key " \
"from %s.%s FORCE INDEX (`PRIMARY`) " \
"where %s >= %s and %s < %s" % (pri_key, db, tbl, pri_key, key_start, pri_key, key_end)
db_cur.execute(sql_str)
chunk_pri_key_list = db_cur.fetchall()
row_crc_list = {}
for per_pri_key in chunk_pri_key_list:
sql_str = "SELECT " \
"COALESCE(LOWER(CONV(BIT_XOR(CAST(CRC32(CONCAT_WS('#', %s)) AS UNSIGNED)), 10, 16)), 0) AS crc " \
"FROM %s.%s FORCE INDEX (`PRIMARY`) " \
"WHERE (%s = %s)" % (tab_cols, db, tbl, pri_key, per_pri_key['pri_key'])
# print(sql_str)
db_cur.execute(sql_str)
per_row_checksum = db_cur.fetchall()
row_crc_list[per_pri_key['pri_key']] = per_row_checksum[0]['crc']
return row_crc_list
def isnone(value):
if value is None:
return "NULL"
else:
return value
def general_fix_sql(sql_type, db, tbl, key_value, **db_info):
db_conn = get_db_conn(**db_info)
db_cur = db_conn.cursor(dictionary=True)
pri_key = get_pri_key(db, tbl, **db_info)
if sql_type == 'replace':
sql_str = "SELECT * FROM %s.%s FORCE INDEX (`PRIMARY`) WHERE %s=%s" % (db, tbl, pri_key, key_value)
db_cur.execute(sql_str)
res = db_cur.fetchall()
row_key = ', '.join('`' + str(v) + '`' for v in res[0].keys())
row_value = ', '.join('\'' + str(v) + '\'' if isinstance(v, str) or isinstance(v, datetime.datetime) else str(isnone(v)) for v in res[0].values())
fix_sql = "replace into %s.%s (%s) values (%s);" % (db, tbl, row_key, row_value)
elif sql_type == 'delete':
fix_sql = "delete from %s.%s where %s=%s;" % (db, tbl, pri_key, key_value)
return fix_sql
if __name__ == '__main__':
for st_name in TABLES_CHECK.split(','):
schema, table = st_name.split('.')
print(source_checksum(schema, table))
print(target_checksum(schema, table))
compare_res = chunk_compare(schema, table)
if compare_res:
for compare_res_row in compare_res:
dict_source_key_crc = \
checksum_rows(schema, table, compare_res_row['chunk_key_start'], compare_res_row['chunk_key_end'], **DB_SOURCE)
dict_target_key_crc = \
checksum_rows(schema, table, compare_res_row['chunk_key_start'], compare_res_row['chunk_key_end'], **DB_TARGET)
# a集合独有的&a,b集合都有但是值不同的元素,直接replace即可
set_ins_upd = set(dict_source_key_crc.items()) - set(dict_target_key_crc.items())
if set_ins_upd:
for row in set_ins_upd:
print(general_fix_sql('replace', schema, table, row[0], **DB_SOURCE))
# b集合独有的key,直接删除即可
set_del = set(dict_target_key_crc.keys()) - set(dict_source_key_crc.keys())
if set_del:
for row in set_del:
print(general_fix_sql('delete', schema, table, row, **DB_TARGET))