release-2.1: backport 32387 and 32429 #32692
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cc @petermattis here's the backport -- cc @nvanbenschoten and @ajwerner, is this going to be merged? |
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Sorry I dropped the ball on this. It was decided that this wasn’t
ultimately the fix for the linked issue but it wouldn’t hurt. does it
interfere with your backporting your recent etcd fix? I’ll fix it up now
either way
…On Tue, Dec 18, 2018 at 9:20 AM Tobias Grieger ***@***.***> wrote:
cc @petermattis <https://github.com/petermattis> here's the backport --
cc @nvanbenschoten <https://github.com/nvanbenschoten> and @ajwerner
<https://github.com/ajwerner>, is this going to be merged?
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No, but I just backported "all of the Raft". You can just not change vendor and your PR should go through, I think! |
Before this change, the size of log committed log entries which a replica could apply at a time was bound to the same configuration as the total size of log entries which could be sent in a message (MaxSizePerMsg) which is generally kilobytes. This limit had an impact on the throughput of writes to a replica, particularly when writing large amounts of data. A new raft configuration option MaxCommittedSizePerReady was adding to etcd/raft in (etcd-io/etcd#10258) which allows these two size parameters to be decoupled. This change adopts the configuration and sets it to a default of 64MB. On the below workload which is set up to always return exactly one entry per Ready with the old configuration we see a massive win in both throughput and latency. ``` ./workload run kv {pgurl:1-3} \ --init --splits=10 \ --duration 60s \ --read-percent=${READ_PERCENT} \ --min-block-bytes=8193 --max-block-bytes=16385 \ --concurrency=1024 ``` ``` name old ops/s new ops/s delta KV0 483 ± 3% 2025 ± 3% +319.32% (p=0.002 n=6+6) ``` Before: ``` _elapsed___errors_____ops(total)___ops/sec(cum)__avg(ms)__p50(ms)__p95(ms)__p99(ms)_pMax(ms)__total 60.0s 0 29570 492.8 1981.2 2281.7 5100.3 5637.1 6442.5 write 60.0s 0 28405 473.4 2074.8 2281.7 5637.1 6710.9 7516.2 write 60.0s 0 28615 476.9 2074.3 2550.1 5905.6 6442.5 8321.5 write 60.0s 0 28718 478.6 2055.4 2550.1 5100.3 6442.5 7516.2 write 60.0s 0 28567 476.1 2079.8 2684.4 4831.8 5368.7 6442.5 write 60.0s 0 29981 499.7 1975.7 1811.9 5368.7 6174.0 6979.3 write ``` After: ``` _elapsed___errors_____ops(total)___ops/sec(cum)__avg(ms)__p50(ms)__p95(ms)__p99(ms)_pMax(ms)__total 60.0s 0 119652 1994.0 510.9 486.5 1006.6 1409.3 4295.0 write 60.0s 0 125321 2088.4 488.5 469.8 906.0 1275.1 4563.4 write 60.0s 0 119644 1993.9 505.2 469.8 1006.6 1610.6 5637.1 write 60.0s 0 119027 1983.6 511.4 469.8 1073.7 1946.2 4295.0 write 60.0s 0 121723 2028.5 500.6 469.8 1040.2 1677.7 4160.7 write 60.0s 0 123697 2061.4 494.1 469.8 1006.6 1610.6 4295.0 write ``` Fixes cockroachdb#31511 Release note: None
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tbg
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Dec 18, 2018
nvanbenschoten
approved these changes
Dec 18, 2018
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Backport:
Please see individual PRs for details.
/cc @cockroachdb/release