将数亿个小图像存储到键/值存储或其他nosql数据库是个好主意吗? [英] Is it a good idea to store hundreds of millions small images to a key/value store or other nosql database?

问题描述

我正在开发一个Web系统，以处理ReiserFS上的大量小型图像，大约1亿个50kb〜200kb的图像.

I am developing a web system to handle a very large set of small images, about 100 millions images of 50kb ~ 200kb, working on ReiserFS.

目前，difficult to backup and sync只是大量的小文件.

For now, it is very difficult to backup and sync those large number of small files.

我的问题是，将这些小图像存储到键/值存储或其他Nosql数据库(例如GridFS (Mongodb)，Tokyo Tyrant，Voldemort)以获得更好的性能并带来更好的备份支持是一个好主意吗?

My question is that if it a good idea to store these small images to a key/value store or other nosql database such as GridFS (Mongodb), Tokyo Tyrant, Voldemort to gain more performance and bring better backup support?

推荐答案

首先，看看以下内容:

First off, have a look at this: Storing a millon images in the filesystem. While it isn't about backups, it is a worthwile discussion of the topic at hand.

是的，大量小文件令人讨厌；它们占用inode，需要用于文件名& c的空间. (并且花时间来备份所有这些元数据).基本上，听起来好像您已经弄清楚了文件的提供；如果在nginx上运行它，并且前面带有varnish，则几乎无法使其更快.在该数据库下添加数据库只会使事情变得更加复杂.在备份方面也是如此. las，我建议您更加努力地执行就地FS备份策略.

And yes, large numbers of small files are pesky; They take up inodes, require space for filenames &c. (And it takes time to do backup of all this meta-data). Basically it sounds like you got the serving of the files figured out; if you run it on nginx, with a varnish in front or such, you can hardly make it any faster. Adding a database under that will only make things more complicated; also when it comes to backing up. Alas, I would suggest working harder on a in-place FS backup strategy.

首先，您是否尝试过使用-az开关(分别为存档和压缩)进行rsync?它们往往非常高效，因为它不会一次又一次地传输相同的文件.

First off, have you tried rsync with the -az-switches (archive and compression, respectively)? They tend to be highly effective, as it doesn't transfer the same files again and again.

或者，我的建议是将tar + gz转换为许多文件.用伪代码(并假设您将它们放在不同的子文件夹中):

Alternately, my suggestion would be to tar + gz into a number of files. In pseudo-code (and assuming you got them in different sub-folders):

foreach prefix (`ls -1`):
    tar -c $prefix | gzip -c -9 | ssh -z destination.example.tld "cat > backup_`date --iso`_$prefix.tar.gz"
end

这将创建许多.tar.gz文件，这些文件可以轻松传输而不会产生过多开销.

This will create a number of .tar.gz-files that are easily transferred without too much overhead.

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