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import redis
import json
import time
from typing import Dict, List, Tuple
class RedisBigKeyDetector:
def __init__(self, host: str, port: int, password: str = None):
self.redis_client = redis.Redis(
host=host,
port=port,
password=password,
decode_responses=True
)
self.big_keys = []
def detect_big_keys(self, threshold: int = 10240) -> List[Dict]:
"""检测大Key"""
print("开始检测Redis大Key...")
keys = self.redis_client.keys('*')
total_keys = len(keys)
for i, key in enumerate(keys):
if i % 1000 == 0:
print(f"进度: {i}/{total_keys}")
key_info = self._analyze_key(key, threshold)
if key_info:
self.big_keys.append(key_info)
return self.big_keys
def _analyze_key(self, key: str, threshold: int) -> Dict:
"""分析单个Key"""
key_type = self.redis_client.type(key)
if key_type == 'string':
return self._analyze_string_key(key, threshold)
elif key_type == 'hash':
return self._analyze_hash_key(key, threshold)
elif key_type == 'list':
return self._analyze_list_key(key, threshold)
elif key_type == 'set':
return self._analyze_set_key(key, threshold)
elif key_type == 'zset':
return self._analyze_zset_key(key, threshold)
return None
def _analyze_string_key(self, key: str, threshold: int) -> Dict:
"""分析String类型Key"""
try:
memory_usage = self.redis_client.memory_usage(key)
if memory_usage > threshold:
return {
'key': key,
'type': 'string',
'size': memory_usage,
'description': f'String类型，大小: {memory_usage} bytes'
}
except Exception as e:
print(f"分析String Key {key} 失败: {e}")
return None
def _analyze_hash_key(self, key: str, threshold: int) -> Dict:
"""分析Hash类型Key"""
try:
field_count = self.redis_client.hlen(key)
if field_count > 1000:
sample_fields = self.redis_client.hscan(key, count=10)[1]
avg_field_size = sum(len(str(k)) + len(str(v)) for k, v in sample_fields.items()) / len(sample_fields)
estimated_size = field_count * avg_field_size
return {
'key': key,
'type': 'hash',
'field_count': field_count,
'estimated_size': estimated_size,
'description': f'Hash类型，field数量: {field_count}，估算大小: {estimated_size} bytes'
}
except Exception as e:
print(f"分析Hash Key {key} 失败: {e}")
return None
def _analyze_list_key(self, key: str, threshold: int) -> Dict:
"""分析List类型Key"""
try:
list_length = self.redis_client.llen(key)
if list_length > 1000:
sample_elements = self.redis_client.lrange(key, 0, 9)
avg_element_size = sum(len(str(elem)) for elem in sample_elements) / len(sample_elements)
estimated_size = list_length * avg_element_size
return {
'key': key,
'type': 'list',
'length': list_length,
'estimated_size': estimated_size,
'description': f'List类型，长度: {list_length}，估算大小: {estimated_size} bytes'
}
except Exception as e:
print(f"分析List Key {key} 失败: {e}")
return None
def _analyze_set_key(self, key: str, threshold: int) -> Dict:
"""分析Set类型Key"""
try:
set_size = self.redis_client.scard(key)
if set_size > 1000:
sample_elements = list(self.redis_client.sscan(key, count=10)[1])
avg_element_size = sum(len(str(elem)) for elem in sample_elements) / len(sample_elements)
estimated_size = set_size * avg_element_size
return {
'key': key,
'type': 'set',
'size': set_size,
'estimated_size': estimated_size,
'description': f'Set类型，大小: {set_size}，估算大小: {estimated_size} bytes'
}
except Exception as e:
print(f"分析Set Key {key} 失败: {e}")
return None
def _analyze_zset_key(self, key: str, threshold: int) -> Dict:
"""分析ZSet类型Key"""
try:
zset_size = self.redis_client.zcard(key)
if zset_size > 1000:
sample_elements = self.redis_client.zscan(key, count=10)[1]
avg_element_size = sum(len(str(k)) + 8 for k, v in sample_elements) / len(sample_elements)
estimated_size = zset_size * avg_element_size
return {
'key': key,
'type': 'zset',
'size': zset_size,
'estimated_size': estimated_size,
'description': f'ZSet类型，大小: {zset_size}，估算大小: {estimated_size} bytes'
}
except Exception as e:
print(f"分析ZSet Key {key} 失败: {e}")
return None
def generate_report(self) -> str:
"""生成检测报告"""
if not self.big_keys:
return "未发现大Key"
report = f"发现 {len(self.big_keys)} 个大Key:\n\n"
for i, key_info in enumerate(self.big_keys, 1):
report += f"{i}. {key_info['description']}\n"
return report
if __name__ == "__main__":
detector = RedisBigKeyDetector("127.0.0.1", 6379, "password")
big_keys = detector.detect_big_keys(threshold=10240)
report = detector.generate_report()
print(report)
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