How can I set s3 connection to keep alive?

I wanna uploading lots of files to s3 service every time. I made 10 workers to upload files using thread. But a message, “Resetting dropped connection”, is shown repeatedly. I guess s3 connection is newly opened per one time. How can I set connection to keep alive?

import threading
import boto3

s3 = boto3.resource('s3')

class Worker(threading.Thread):
    ...
    def run(self):
        s3.Object(bucket, key).put(Body=body)

[JordonPhillips]

The session itself isn’t thread safe, you’ll need to create a new one for each thread:

import threading
from boto3.session import Session


class Worker(threading.Thread):
    ...
    def run(self):
        s = Session()
        s3 = s.resource('s3')

[jaredtkatz]

What’s the difference between

s = Session()
s3 = s.resource('s3')

and s3 = boto3.resource('s3') ?