Redis BGSAVE 内存不足异常完美解决方案

Handling error: RedisPipelineException, Pipeline contained one or more invalid commands; 
nested exception is io.lettuce.core.RedisCommandExecutionException: 
MISCONF Redis is configured to save RDB snapshots, but it is currently not able to persist on disk. 
Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). 
Please check the Redis logs for details about the RDB error

WARNING overcommit_memory is set to 0! 
Background save may fail under low memory condition. 
To fix this issue add ‘vm.overcommit_memory = 1' to /etc/sysctl.conf 
and then reboot or run the command ‘sysctl vm.overcommit_memory=1' for this to take effect.

# 进入 Redis 客户端
redis-cli
# 临时关闭写操作限制（重启 Redis 后失效）
127.0.0.1:6379> config set stop-writes-on-bgsave-error no
# 验证配置生效
127.0.0.1:6379> config get stop-writes-on-bgsave-error

# 1. 编辑系统内核参数配置文件
vim /etc/sysctl.conf
# 2. 添加/修改如下配置（建议放在文件末尾）
vm.overcommit_memory=1
# 3. 使配置立即生效（无需重启服务器）
sysctl -p
# 4. 验证配置生效
sysctl vm.overcommit_memory
# 预期输出：vm.overcommit_memory = 1

# 示例：关闭自动 RDB 快照（仅保留手动 BGSAVE）
127.0.0.1:6379> config set save ""
# 开启 AOF 持久化（可靠性更高）
127.0.0.1:6379> config set appendonly yes

127.0.0.1:6379> config set maxmemory 4GB
127.0.0.1:6379> config set maxmemory-policy allkeys-lru

echo never > /sys/kernel/mm/transparent_hugepage/enabled
# 永久生效：添加到 /etc/rc.local

# 查看最后一次 BGSAVE 状态
127.0.0.1:6379> info persistence
# 关键指标：rdb_last_bgsave_status（成功为 ok）、aof_last_write_status