在Redis仍在运行时Redis /创建新的.rdb文件(Redis / Create new .rdb file while Redis is still running)

 我使用Redis，今天我开始得到以下异常： 
 
Can't save in background: fork: Cannot allocate memory
 
 据我所知，出现此错误是因为我的数据库太大，并且此进程没有内存。 
 
 所以我开始删除表格，但问题是Redis没有成功将其写入光盘，并且面对它并不知道这些变化。 
 
 我决定创建新的.rdb文件（在/etc/redis.config ），然后使用新的RDB文件更改文件路径： 
 
dbfilename dump_cache_new.rdb
 
 然后，我将重新加载对我来说至关重要的所有数据（我可以这样做 - 从我的文件系统中获取数据），然后重新启动redis服务。 
 
 问题是我无法创建此文件，因为redis现在正在使用旧路径执行（并且Redis必须运行，因为其他进程从中获取一些关键数据）。 
 
 如何创建此dump_cache_new.rdb文件，而redis仍在使用旧路径运行？ 

I use Redis, and today I start to get the following exception:
 
Can't save in background: fork: Cannot allocate memory
 
As I understand, this error appears because my DB is too big, and there is no memory for this process.
 
So I start to delete tables, but the problem is that Redis doesn't success to write it to the disc, and in face it doesn't know about this changes.
 
I decided to create new .rdb file (in /etc/redis.config), and then change the file path with the new RDB file:
 
dbfilename dump_cache_new.rdb
 
Then, I will reload all the data which critical to me (I can do it - its data from my file system), and restart redis service.
 
The problem is that I can't create this file, because redis is now executing with the old path (and Redis has to run, because other process takes some critical data from it).
 
How can I create this dump_cache_new.rdb file, while redis is still running with the old path?

原文：https://stackoverflow.com/questions/34233469