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Parallel streams with buffers

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3-5 天
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35/100
Issue 类型
功能
描述清晰度
需要澄清
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停滞
技术栈
python

调研方向

Start with the provided Stream(asynchronous=True) example and trace how map, buffer, and sink schedule their work. Compare the stream's behavior with the stated 30-second runtime and expected 21-second runtime; done means the issue's intended parallel download and processing behavior is clearly established, including whether Dask is appropriate.

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描述

In a simple use case like downloading files and process them on a single machine, how could one achieve parallelization of downloads and processes with buffers?

Example:

import time
from streamz import Stream
from tornado.ioloop import IOLoop


def download_file(file_id: int):
    time.sleep(1)
    print(f"Downloaded file: {file_id}")
    return file_id


def process_file(file_id: int):
    time.sleep(2)
    print(f"Processed file : {file_id}")
    return file_id


async def streamz_run():
    s = Stream(asynchronous=True)
    s.map(download_file).buffer(4).sink(process_file)
    for i in range(10):
        await s.emit(i)


if __name__ == '__main__':
    start = time.time()
    IOLoop().run_sync(streamz_run)
    print(f"Streamz run took: {time.time() - start}s")

The download_file is properly buffered but not executed at the same time as process_file. The whole thing takes ~30s to run while we could expect 21s with parallel downloads/processes. Is using Dask the intended way in that case?

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环境准备

  • 提供 Dockerfile 或 Docker Compose 文件
  • 没有 Pull Request 模板
  • 阅读贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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