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osd: EC Partial Stripe Reads (Retry of #23138)
This is a re-implementation of PR #23138 rebased on main with a couple of nitpicky changes to make the code a little more clear (to me at least). Credit goes to Xiaofei Cui [cuixiaofei@sangfor.com.cn](mailto:cuixiaofei@sangfor.com.cn) for the original implementation. Looking at the original PR's review, it does not appear that we can use the same technique as in 468ad4b. We don't have the ReadOp yet. I'm not sure if @gregsforytwo's idea to query the plugin works, but it's clear we are not doing the efficient thing from the get-go here. The performance and efficiency benefits for small random reads appears to be quite substantial, especially for large stripe widths. Signed-off-by: Mark Nelson <mark.nelson@clyso.com>
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