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import pymysql
import hashlib
import time
class DataConsistencyChecker:
def __init__(self, master_config, slave_configs):
self.master_config = master_config
self.slave_configs = slave_configs
def get_table_checksum(self, config, database, table):
"""获取表校验和"""
try:
conn = pymysql.connect(**config)
cursor = conn.cursor()
cursor.execute(f"""
SELECT
COUNT(*) as row_count,
MD5(GROUP_CONCAT(CONCAT_WS('|', *))) as data_hash
FROM {database}.{table}
""")
result = cursor.fetchone()
conn.close()
return {
'row_count': result[0],
'data_hash': result[1]
}
except Exception as e:
print(f"获取表校验和失败: {str(e)}")
return None
def check_table_consistency(self, database, table):
"""检查表一致性"""
master_checksum = self.get_table_checksum(self.master_config, database, table)
if not master_checksum:
return False
inconsistencies = []
for slave_config in self.slave_configs:
slave_checksum = self.get_table_checksum(slave_config, database, table)
if not slave_checksum:
inconsistencies.append({
'slave_host': slave_config['host'],
'error': '无法获取校验和'
})
continue
if (master_checksum['row_count'] != slave_checksum['row_count'] or
master_checksum['data_hash'] != slave_checksum['data_hash']):
inconsistencies.append({
'slave_host': slave_config['host'],
'master_row_count': master_checksum['row_count'],
'slave_row_count': slave_checksum['row_count'],
'master_hash': master_checksum['data_hash'],
'slave_hash': slave_checksum['data_hash']
})
return inconsistencies
def check_all_tables_consistency(self):
"""检查所有表的一致性"""
try:
conn = pymysql.connect(**self.master_config)
cursor = conn.cursor()
cursor.execute("SHOW DATABASES")
databases = [row[0] for row in cursor.fetchall()]
all_inconsistencies = {}
for database in databases:
if database in ['information_schema', 'performance_schema', 'mysql', 'sys']:
continue
cursor.execute(f"SHOW TABLES FROM {database}")
tables = [row[0] for row in cursor.fetchall()]
for table in tables:
print(f"检查表 {database}.{table}...")
inconsistencies = self.check_table_consistency(database, table)
if inconsistencies:
all_inconsistencies[f"{database}.{table}"] = inconsistencies
conn.close()
return all_inconsistencies
except Exception as e:
print(f"检查表一致性失败: {str(e)}")
return None
def repair_inconsistency(self, database, table, slave_config):
"""修复不一致"""
try:
print(f"修复从库 {slave_config['host']} 的表 {database}.{table}")
conn = pymysql.connect(**slave_config)
cursor = conn.cursor()
cursor.execute("STOP SLAVE")
backup_time = time.strftime('%Y%m%d_%H%M%S')
backup_cmd = [
'mysqldump', '-h', slave_config['host'],
'-u', slave_config['user'],
'-p' + slave_config['password'],
database, table
]
import subprocess
with open(f'/tmp/{database}_{table}_backup_{backup_time}.sql', 'w') as f:
subprocess.run(backup_cmd, stdout=f, check=True)
cursor.execute(f"DROP TABLE IF EXISTS {database}.{table}")
master_conn = pymysql.connect(**self.master_config)
master_cursor = master_conn.cursor()
master_cursor.execute(f"SHOW CREATE TABLE {database}.{table}")
create_table_sql = master_cursor.fetchone()[1]
cursor.execute(create_table_sql)
master_cursor.execute(f"SELECT * FROM {database}.{table}")
rows = master_cursor.fetchall()
for row in rows:
placeholders = ','.join(['%s'] * len(row))
cursor.execute(f"INSERT INTO {database}.{table} VALUES ({placeholders})", row)
master_conn.close()
conn.commit()
conn.close()
print(f"表 {database}.{table} 修复完成")
return True
except Exception as e:
print(f"修复表 {database}.{table} 失败: {str(e)}")
return False
if __name__ == "__main__":
master_config = {
'host': '192.168.1.10',
'user': 'root',
'password': 'password',
'database': 'mysql'
}
slave_configs = [
{
'host': '192.168.1.11',
'user': 'root',
'password': 'password',
'database': 'mysql'
}
]
checker = DataConsistencyChecker(master_config, slave_configs)
inconsistencies = checker.check_all_tables_consistency()
if inconsistencies:
print("发现数据不一致:")
for table, issues in inconsistencies.items():
print(f"表 {table}:")
for issue in issues:
print(f" 从库 {issue['slave_host']}: {issue}")
else:
print("所有表数据一致")
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