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[dev] Optimize batch fetch method to boost throughput #269

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@NiuBlibing NiuBlibing commented Feb 8, 2023

Description

The previous start url fetching method only working when spider is idle, which is not full concurrency.This patch optimizes it by using request_left_downloader signal.

There maybe need a lock for calculating the need_size.

Fixes #119

How Has This Been Tested?

  • tox -e py38 -- tests/

Test Configuration:

  • OS version: debian 11 and Windows10
  • Necessary Libraries (optional):

Checklist:

  • My code follows the style guidelines of this project
  • I have performed a self-review of my code
  • I have commented my code, particularly in hard-to-understand areas
  • I have made corresponding changes to the documentation
  • My changes generate no new warnings
  • I have added tests that prove my fix is effective or that my feature works
  • New and existing unit tests pass locally with my changes
  • Any dependent changes have been merged and published in downstream modules

NiuBlibing and others added 2 commits February 8, 2023 16:23
The previous start url fetching method only working when spider
is idle, which is not full concurrency.This patch optimizes it by
using request_left_downloader signal.

Signed-off-by: Tianyue Ren <[email protected]>
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LuckyPigeon commented Jun 10, 2023

@NiuBlibing Please resolve the assertion error. And add unit test for fill_requests_queue, thanks!

@LuckyPigeon LuckyPigeon changed the title [patch v1] optimize batch fetch method to boost throughput [dev] Optimize batch fetch method to boost throughput Jun 21, 2023
@LuckyPigeon LuckyPigeon self-assigned this Jun 21, 2023
@LuckyPigeon LuckyPigeon enabled auto-merge (squash) June 21, 2023 02:27
@LuckyPigeon LuckyPigeon enabled auto-merge (squash) June 21, 2023 02:28
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LuckyPigeon commented Jun 21, 2023

@rmax How do you think about this implementation, it disabled spider_idel usage. I wonder if we need a switch between spider_idle and fill_requests_queue.

@LuckyPigeon LuckyPigeon requested a review from rmax June 21, 2023 02:30
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rmax commented Jun 21, 2023

@rmax How do you think about this implementation, it disabled spider_idel usage. I wonder if we need a switch between spider_idle and fill_requests_queue.

Interesting the use of the other signal. What scrapy version is required for the new signal?

What happens with existing users that override the spider_idle method?

Does it make sense to bump the major version? Or somewhat related, shall we migrate to calendar versioning?

@rmax rmax force-pushed the master branch 2 times, most recently from daccc92 to 3245d28 Compare July 6, 2024 21:23
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Suggesting new way to schedule requests
3 participants