Add write amp rate limiter#368
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Signed-off-by: v01dstar <yang.zhang@pingcap.com> Signed-off-by: Yang Zhang <yang.zhang@pingcap.com>
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@LykxSassinator: adding LGTM is restricted to approvers and reviewers in OWNERS files. DetailsIn response to this:
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Signed-off-by: Yang Zhang <yang.zhang@pingcap.com>
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@SpadeA-Tang: adding LGTM is restricted to approvers and reviewers in OWNERS files. DetailsIn response to this: Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. |
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wait for merging of #376. |
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/lgtm refresh |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: LykxSassinator, SpadeA-Tang, wuhuizuo The full list of commands accepted by this bot can be found here. The pull request process is described here DetailsNeeds approval from an approver in each of these files:
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New changes are detected. LGTM label has been removed. |
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Merge #381 with this for future cherry-pick. |
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This PR are following PRs combined:
The WriteAmpBasedRateLimiter automatically adjusts rate limiting by predicting I/O trends using heuristic methods based on the write amplification factor. e.g. a high write throughput with
HIGHpriority (flush) implies, highly likely, there will beLOWpriority write throughput soon, because RocksDB needs to compact the L0 files to lower levels, it is better to provision in advance. Compared to the default rate limiter, it reduces the likelihood of triggering write stalls and helps prevent I/O jitter.Comments:
* Env::IOPriority has more options now,
LOW,MID,HIGH,USERinstead of justLOWandHIGH, write amplification rate limiter's tuning logic may need to adjust to this change.