遍历AWS S3存储桶中的对象

问题描述：

我拥有的脚本正在运行，但是我正在扫描的存储桶很大，并且过一会儿就会超时.我该怎么做才能提高效率或从特定位置开始?

The script I have is working, but the bucket I am scanning over is massive and times out after a while. What can I do to make this more efficient or start from a specific location?

import boto3

s3 = boto3.resource('s3')
b = s3.Bucket('my_bucket')

for obj in b.objects.all():
   # Open the file, run some RegEx to find some data. If it's found, output to a log file

我遇到的第一个问题是水桶的大小.它大约有150万个对象.我用我的代码打开文本文件，寻找一些RegEx，如果RegEx上存在匹配项，则输出对象名称和找到的内容.

The first problem I have is the size of the bucket. It's about 1.5 million objects. I have my code opening up text files looking for some RegEx and if there's a match on the RegEx then it outputs the Object name and what was found.

运行脚本大约一个小时后，它会在引发错误之前将其容纳约40k个对象:

After running the script for about an hour, it makes it about 40k objects in before throwing an error:

requests.exceptions.ConnectionError: ('Connection aborted.', BadStatusLine("''",))

或

object at 0x109e82d50>: Failed to establish a new connection: [Errno 60] Operation timed out',))

它搜索的搜索项是按字母顺序排列的，因此我们将其说成是通过"E"部分，然后超时.我想从以"F"开头的对象开始.

The search items it's searching through are alphabetical, so we'll say it makes it through the "E" section and then times out. I want start with objects starting with "F".

答

如果您的Amazon S3存储桶中有大量对象，则 objects.all()不是一种有效的迭代方法，因为它会尝试将它们全部同时加载到内存中.

If you have a large number of objects in your Amazon S3 bucket, then objects.all() is not an efficient iteration method, since it tries to load them all into memory simultaneously.

相反，请使用 list_objects_v2() 来逐个浏览1000个对象.然后，使用返回的 ContinuationToken 再次调用它.

Instead, use list_objects_v2() to page through the objects in groups of 1000. Then, call it again with the ContinuationToken that was returned.

您实际上将需要一个 for 循环，调用 list_objects_v2()，并在其中的另一个 for 循环中遍历每个对象.

You will effectively need a for loop calling list_objects_v2() and another for loop within that which loops through each object.

遍历AWS S3存储桶中的对象

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